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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking
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Another battery charger question
Thanks for all the replies and knowledge. My other battery charger is a
one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. |
#2
Posted to rec.crafts.metalworking
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Another battery charger question
Tom Gardner Mars@tacks wrote:
Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. This could be normal behavior for this charger. There are chargers, such as for small electronics that won't charge a "dead" battery. I've seen this for NiMH chargers more than for other types. Keep in mind that a 12 volt meter reading on a 12 volt battery indicates the battery is already discharged. Lower than that means it's been sitting around, is cold or is trashed. |
#3
Posted to rec.crafts.metalworking
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Another battery charger question
Tom Gardner wrote:
Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I went through this when stranded at a remote cabin with a car with a dead battery. Most of these smart chargers have some stupid secret code to "rejuvenate" a totally dead battery. You may have to push multiple buttons, hold for several seconds or whatever, and no way to figure it out without the manual. I had to play with that unit for MANY minutes before I was able to translate the Chinglish instructions into the right buttons to make it start charging. Jon |
#4
Posted to rec.crafts.metalworking
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Another battery charger question
On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote:
I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I have not actually seen the book , but there is a book entitled " Basic Electronics' which is a Navy training book. Published in 1972. Look on Abe or Amazon. http://www.abebooks.com/servlet/Book...6amp%3Bsts%3Dt Dan On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote: I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. |
#6
Posted to rec.crafts.metalworking
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Another battery charger question
"Tom Gardner" Mars@Tacks wrote in message
... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I learned electronics in the Army, without textbooks or homework, which was nice. There are some courses on the Internet and Radio Shack has books, but I doubt you'll find anything that takes you from beginner to fixing an antique battery charger. jsw |
#7
Posted to rec.crafts.metalworking
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Another battery charger question
On Wed, 26 Feb 2014 14:33:33 -0600, Jon Elson
wrote: Tom Gardner wrote: Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I went through this when stranded at a remote cabin with a car with a dead battery. Most of these smart chargers have some stupid secret code to "rejuvenate" a totally dead battery. You may have to push multiple buttons, hold for several seconds or whatever, and no way to figure it out without the manual. I had to play with that unit for MANY minutes before I was able to translate the Chinglish instructions into the right buttons to make it start charging. Jon The reason they won't charge a dead battery is the "polarity protection" circuit to prevent hooking the charger up backwards and doing damage to either the charger, the battery, or both. |
#8
Posted to rec.crafts.metalworking
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Another battery charger question
"Tom Gardner" Mars@Tacks wrote in message
... Thanks for all the replies and knowledge. http://w3hwj.com/index_files/RBSelenium2.pdf |
#9
Posted to rec.crafts.metalworking
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Another battery charger question
"Tom Gardner" wrote in message
... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Comparing to piping, hydraulics, fluidics, pneumatics... Volts are pressure Amps is flow Resistance is opposition to flow, a restriction in the line. Power (watts) is the product of flow and pressure. Rectifiers are like check valves. capacitors are like storage tanks, accumulators or air tanks. transistors are like pilot operated valves AC would be kind of like a piston pump with no check valves, the power goes one way and then the other. So. using this back and forth fluid could drive a piston one size that is connected to a different size piston, either increasing pressure and decreasing volume, or increasing volume and decreasing pressure. That would be kind of like a transformer, it takes alternating current to make it work. So if you transformed your pumps force and pressure, it could be changed after the transformer by adding check valves at that point. The old fashioned battery charger transforms the line voltage to a lower voltage at a higher current. Then a rectifier causes it to flow only one way into the battery. Magnetic field going through a wire induces a voltage in the wire, not sure what that would compare to in hydraulics. The magnetic field inducing voltage has to do with transformers, motors, inductors, antenna, and other. RogerN |
#10
Posted to rec.crafts.metalworking
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Another battery charger question
On Wed, 26 Feb 2014 16:44:15 -0500, "Jim Wilkins"
wrote: "Tom Gardner" Mars@Tacks wrote in message m... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I learned electronics in the Army, without textbooks or homework, which was nice. There are some courses on the Internet and Radio Shack has books, but I doubt you'll find anything that takes you from beginner to fixing an antique battery charger. You never know, though. With old farts like Tawm...there may be enough other, and relevant, experiences to make connections. -- Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air. -- John Quincy Adams |
#11
Posted to rec.crafts.metalworking
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Another battery charger question
On 2/26/2014 4:01 PM, wrote:
On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote: I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I have not actually seen the book , but there is a book entitled " Basic Electronics' which is a Navy training book. Published in 1972. Look on Abe or Amazon. http://www.abebooks.com/servlet/Book...6amp%3Bsts%3Dt Dan On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote: I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Cool, I can get one for about $5! |
#12
Posted to rec.crafts.metalworking
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Another battery charger question
On 2/26/2014 4:44 PM, Jim Wilkins wrote:
"Tom Gardner" Mars@Tacks wrote in message ... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I learned electronics in the Army, without textbooks or homework, which was nice. There are some courses on the Internet and Radio Shack has books, but I doubt you'll find anything that takes you from beginner to fixing an antique battery charger. jsw The charger was bought new in '75...is it an antique now? I have a LOT of miles on it...consider the cars I had in college... |
#13
Posted to rec.crafts.metalworking
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Another battery charger question
On 2/26/2014 8:32 PM, Jim Wilkins wrote:
"Tom Gardner" Mars@Tacks wrote in message ... Thanks for all the replies and knowledge. http://w3hwj.com/index_files/RBSelenium2.pdf Good article! Thanks! |
#14
Posted to rec.crafts.metalworking
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Another battery charger question
Jim Wilkins wrote:
"Tom Gardner" Mars@Tacks wrote in message ... Thanks for all the replies and knowledge. http://w3hwj.com/index_files/RBSelenium2.pdf Why does the author call the cathode of a diode "+"?? |
#15
Posted to rec.crafts.metalworking
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Another battery charger question
"Tom Gardner" Mars@Tacks wrote in message
... On 2/26/2014 4:01 PM, wrote: On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote: I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I have not actually seen the book , but there is a book entitled " Basic Electronics' which is a Navy training book. Published in 1972. Look on Abe or Amazon. http://www.abebooks.com/servlet/Book...6amp%3Bsts%3Dt Dan On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote: I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Cool, I can get one for about $5! Googling "navy electronics manual" brought a lot of links, mostly too big for me to check with dialup. http://jacquesricher.com/NEETS/ I did look at the first chapter from hnsa.org, one of my favorite sources. The preliminary stuff on atomic structure is important once you reach transistors, and for batteries. They changed the name from Electric to Electron-ic for good reason. The Navy put out the best self-study guides, I think because sailors were stuck in their bunks off-duty whereas Army and Air Force guys could go out drinking. jsw |
#16
Posted to rec.crafts.metalworking
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Another battery charger question
On 2/26/2014 9:20 PM, RogerN wrote:
"Tom Gardner" wrote in message ... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Comparing to piping, hydraulics, fluidics, pneumatics... Volts are pressure Amps is flow Resistance is opposition to flow, a restriction in the line. Power (watts) is the product of flow and pressure. Rectifiers are like check valves. capacitors are like storage tanks, accumulators or air tanks. transistors are like pilot operated valves AC would be kind of like a piston pump with no check valves, the power goes one way and then the other. So. using this back and forth fluid could drive a piston one size that is connected to a different size piston, either increasing pressure and decreasing volume, or increasing volume and decreasing pressure. That would be kind of like a transformer, it takes alternating current to make it work. So if you transformed your pumps force and pressure, it could be changed after the transformer by adding check valves at that point. The old fashioned battery charger transforms the line voltage to a lower voltage at a higher current. Then a rectifier causes it to flow only one way into the battery. Magnetic field going through a wire induces a voltage in the wire, not sure what that would compare to in hydraulics. The magnetic field inducing voltage has to do with transformers, motors, inductors, antenna, and other. RogerN Good analogies Roger! |
#17
Posted to rec.crafts.metalworking
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Another battery charger question
"Tom Gardner" Mars@Tacks wrote in message
news On 2/26/2014 9:20 PM, RogerN wrote: "Tom Gardner" wrote in message ... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Comparing to piping, hydraulics, fluidics, pneumatics... Volts are pressure Amps is flow Resistance is opposition to flow, a restriction in the line. Power (watts) is the product of flow and pressure. Rectifiers are like check valves. capacitors are like storage tanks, accumulators or air tanks. transistors are like pilot operated valves AC would be kind of like a piston pump with no check valves, the power goes one way and then the other. So. using this back and forth fluid could drive a piston one size that is connected to a different size piston, either increasing pressure and decreasing volume, or increasing volume and decreasing pressure. That would be kind of like a transformer, it takes alternating current to make it work. So if you transformed your pumps force and pressure, it could be changed after the transformer by adding check valves at that point. The old fashioned battery charger transforms the line voltage to a lower voltage at a higher current. Then a rectifier causes it to flow only one way into the battery. Magnetic field going through a wire induces a voltage in the wire, not sure what that would compare to in hydraulics. The magnetic field inducing voltage has to do with transformers, motors, inductors, antenna, and other. RogerN Good analogies Roger! The water analogy of pressure = voltage, flow = current is useful when you are first learning about Direct Current circuits, but it falls apart quickly for Alternating Current because moving water's inertia isn't the same as inductance, and we don't have the hands-on intuitive experience with AC reversing flows that we do with DC garden hoses. The analogy that helps me with AC is imagining the pistons and crankshaft of an engine. The height of one piston represents the constantly changing voltage of one phase of the power line. If it was an equally spaced three-cylinder radial engine the other two pistons would be the other phases. The three pistons (voltages) combine their push in sequence to force a steady circular rotation of the crankshaft, which was Tesla's inspiration for introducing AC to spin motors without needing troublesome brushes. This makes more sense if you understand sines and cosines. Residential single-phase 120V is a one-cylinder engine and 240V is an opposed twin, like a BMW motorcycle. Since they can hang at top dead center they need a temporary circular push to start in the right direction, the reason why single phase AC motors need starting circuits but three phase ones don't. ..jsw |
#18
Posted to rec.crafts.metalworking
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Another battery charger question
Toro has some good educational stuff on their website, including a basic
primer aimed at teaching technicians enough "electricity" to troubleshoot mower and tractor wiring: http://www.toro.com/customercare/com...df/09170sl.pdf They also have a hydraulics primer that is pretty good: http://www.toro.com/customercare/com...df/09169sl.pdf ----- Regards, Carl Ijames "Tom Gardner" wrote in message ... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. |
#19
Posted to rec.crafts.metalworking
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Another battery charger question
Jim Wilkins wrote:
"Tom Gardner" Mars@Tacks wrote in message news On 2/26/2014 9:20 PM, RogerN wrote: "Tom Gardner" wrote in message ... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Comparing to piping, hydraulics, fluidics, pneumatics... Volts are pressure Amps is flow Resistance is opposition to flow, a restriction in the line. Power (watts) is the product of flow and pressure. Rectifiers are like check valves. capacitors are like storage tanks, accumulators or air tanks. transistors are like pilot operated valves AC would be kind of like a piston pump with no check valves, the power goes one way and then the other. So. using this back and forth fluid could drive a piston one size that is connected to a different size piston, either increasing pressure and decreasing volume, or increasing volume and decreasing pressure. That would be kind of like a transformer, it takes alternating current to make it work. So if you transformed your pumps force and pressure, it could be changed after the transformer by adding check valves at that point. The old fashioned battery charger transforms the line voltage to a lower voltage at a higher current. Then a rectifier causes it to flow only one way into the battery. Magnetic field going through a wire induces a voltage in the wire, not sure what that would compare to in hydraulics. The magnetic field inducing voltage has to do with transformers, motors, inductors, antenna, and other. RogerN Good analogies Roger! The water analogy of pressure = voltage, flow = current is useful when you are first learning about Direct Current circuits, but it falls apart quickly for Alternating Current because moving water's inertia isn't the same as inductance, and we don't have the hands-on intuitive experience with AC reversing flows that we do with DC garden hoses. Gas is actually a better analogy than liquid for electrcity, but once that makes sense you no longer need the analogies anymore. Oh well. |
#20
Posted to rec.crafts.metalworking
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Another battery charger question
On Thu, 27 Feb 2014 21:27:52 -0500, Tom Gardner Mars@Tacks wrote:
On 2/26/2014 9:20 PM, RogerN wrote: "Tom Gardner" wrote in message ... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Comparing to piping, hydraulics, fluidics, pneumatics... Volts are pressure Amps is flow Resistance is opposition to flow, a restriction in the line. Power (watts) is the product of flow and pressure. Rectifiers are like check valves. capacitors are like storage tanks, accumulators or air tanks. transistors are like pilot operated valves AC would be kind of like a piston pump with no check valves, the power goes one way and then the other. So. using this back and forth fluid could drive a piston one size that is connected to a different size piston, either increasing pressure and decreasing volume, or increasing volume and decreasing pressure. That would be kind of like a transformer, it takes alternating current to make it work. So if you transformed your pumps force and pressure, it could be changed after the transformer by adding check valves at that point. The old fashioned battery charger transforms the line voltage to a lower voltage at a higher current. Then a rectifier causes it to flow only one way into the battery. Magnetic field going through a wire induces a voltage in the wire, not sure what that would compare to in hydraulics. The magnetic field inducing voltage has to do with transformers, motors, inductors, antenna, and other. RogerN Good analogies Roger! But past a certain point, the analogy doesn't hold water - - - - . |
#21
Posted to rec.crafts.metalworking
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Another battery charger question
RogerN wrote:
Magnetic field going through a wire induces a voltage in the wire, not sure what that would compare to in hydraulics. The magnetic field inducing voltage has to do with transformers, motors, inductors, antenna, and other. Water hammer, ie. the inertia of the fluid moving through the pipe. Its not a perfect analogy, but then none of this electricity is like water and pipes is perfect, but it conveys the general behavior. Jon |
#22
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Another battery charger question
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#23
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Another battery charger question
"Jon Elson" wrote in message
... wrote: The reason they won't charge a dead battery is the "polarity protection" circuit to prevent hooking the charger up backwards and doing damage to either the charger, the battery, or both. Right, but if you are out in the woods with a dead car battery, you need it to pump a little current into the battery to start the voltage rising. If you get the load that drained the battery turned off, and put a couple hundred mA into it, it won't hurt anything. if the polarity is indeed wrong, the alternator diodes will keep it from rising above about 1.4 V. If the polarity is right, the voltage will keep rising, and eventually the charger will decide to let you have rated current into the battery. Jon If you are out in the woods with a dead car battery the limitations of an automatic charger don't matter. Revive the battery with another vehicle or a portable jump starter. jsw |
#24
Posted to rec.crafts.metalworking
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Another battery charger question
On Wed, 26 Feb 2014 15:05:56 -0600, Tim Wescott
wrote: On Wed, 26 Feb 2014 13:01:10 -0800, wrote: On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote: I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I have not actually seen the book , but there is a book entitled " Basic Electronics' which is a Navy training book. Published in 1972. Look on Abe or Amazon. That sounds like it should be a winner. There may be an "idiot's guide", but I'd hesitate to recommend it without reviewing it. There are literally many thousands of free books on the internet about electronics. Simply go to google and type in Free book basic electronics etc etc Tons of stuff http://www.freebookcentre.net/Electr...ics-Books.html http://www.e-booksdirectory.com/list...p?category=299 http://bookboon.com/en/electrical-el...neering-ebooks Check out these... http://www.e-booksdirectory.com/details.php?ebook=9671 http://www.e-booksdirectory.com/details.php?ebook=8640 http://www.e-booksdirectory.com/details.php?ebook=8091 Just to link to 3..out of many many thousands -- "A "Liberal Paradise" would be a place where everybody has guaranteed employment,free comprehensive healthcare, free education, free food, free housing, free clothing, free utilities, and only Law Enforcement has guns. And believe it or not, such a place does indeed exist . . . It's called PRISON. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com |
#25
Posted to rec.crafts.metalworking
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Another battery charger question
On Wed, 26 Feb 2014 17:18:48 -0500, wrote:
On Wed, 26 Feb 2014 14:33:33 -0600, Jon Elson wrote: Tom Gardner wrote: Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I went through this when stranded at a remote cabin with a car with a dead battery. Most of these smart chargers have some stupid secret code to "rejuvenate" a totally dead battery. You may have to push multiple buttons, hold for several seconds or whatever, and no way to figure it out without the manual. I had to play with that unit for MANY minutes before I was able to translate the Chinglish instructions into the right buttons to make it start charging. Jon The reason they won't charge a dead battery is the "polarity protection" circuit to prevent hooking the charger up backwards and doing damage to either the charger, the battery, or both. Ive had some..some luck hooking another battery in parallel with the dead one and the charger..and then removing the good battery. Gunner -- "A "Liberal Paradise" would be a place where everybody has guaranteed employment,free comprehensive healthcare, free education, free food, free housing, free clothing, free utilities, and only Law Enforcement has guns. And believe it or not, such a place does indeed exist . . . It's called PRISON. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com |
#26
Posted to rec.crafts.metalworking
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Another battery charger question
On 3/1/2014 1:42 AM, Gunner Asch wrote:
On Wed, 26 Feb 2014 15:05:56 -0600, Tim Wescott wrote: On Wed, 26 Feb 2014 13:01:10 -0800, wrote: On Wednesday, February 26, 2014 1:56:26 PM UTC-5, Tom Gardner wrote: I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. I have not actually seen the book , but there is a book entitled " Basic Electronics' which is a Navy training book. Published in 1972. Look on Abe or Amazon. That sounds like it should be a winner. There may be an "idiot's guide", but I'd hesitate to recommend it without reviewing it. There are literally many thousands of free books on the internet about electronics. Simply go to google and type in Free book basic electronics etc etc Tons of stuff http://www.freebookcentre.net/Electr...ics-Books.html http://www.e-booksdirectory.com/list...p?category=299 http://bookboon.com/en/electrical-el...neering-ebooks Check out these... http://www.e-booksdirectory.com/details.php?ebook=9671 http://www.e-booksdirectory.com/details.php?ebook=8640 http://www.e-booksdirectory.com/details.php?ebook=8091 Just to link to 3..out of many many thousands -- "A "Liberal Paradise" would be a place where everybody has guaranteed employment,free comprehensive healthcare, free education, free food, free housing, free clothing, free utilities, and only Law Enforcement has guns. And believe it or not, such a place does indeed exist . . . It's called PRISON. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com Thanks! |
#27
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Another battery charger question
"Tom Gardner" Mars@Tacks wrote in message
... On 3/1/2014 1:42 AM, Gunner Asch wrote: Just to link to 3..out of many many thousands Thanks! Once you are past the basics electronics subdivides into Analog, Digital, Communications and Power. If your concern is machine tools you could concentrate on Power components and circuits and don't need to go very far into the others, which you purchase as modules. jsw |
#28
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Another battery charger question
On Sat, 1 Mar 2014 09:01:29 -0500, "Jim Wilkins"
wrote: "Tom Gardner" Mars@Tacks wrote in message m... On 3/1/2014 1:42 AM, Gunner Asch wrote: Just to link to 3..out of many many thousands Thanks! Once you are past the basics electronics subdivides into Analog, Digital, Communications and Power. If your concern is machine tools you could concentrate on Power components and circuits and don't need to go very far into the others, which you purchase as modules. jsw As a side note...I just wondered why Toms messages arent showing up. I kinda wondered if he was not on here that much anymore and then I see his messages in other peoples quotes. What the frack? He is not in my kill file. -- " I was once told by a “gun safety” advocate back in the Nineties that he favored total civilian firearms confiscation. Only the military and police should have weapons he averred and what did I think about that? I began to give him a reasoned answer and he cut me off with an abrupt, “Give me the short answer.” I thought for a moment and said, “If you try to take our firearms we will kill you.”" --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com |
#29
Posted to rec.crafts.metalworking
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Another battery charger question
"Tom Gardner" wrote in message
... I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. If you're interested in battery charger electronics you can look up some voltage regulator circuits. You can use an adjustable voltage regulator, such as an LM317, by setting the output voltage to what you want the maximum charge voltage to be, you can use it to charge a lead acid battery. By adding a resistor, low ohms and enough power for an amp or so, you can have the regulator lower the charge current while the battery gets nearer to full charge, like the lead acid battery chargers do. I read some interesting charging information about the "Battery Tender" maintenance charger, useful if you want to keep your seasonal batteries in good condition through the off season. I found a PDF file that, on page 4, shows the voltages that the battery tender operates at, "absorption charge" to 14.5 and maintenance charge of 13.2V. http://www.powerwerx.com/download/Pr...rproof_800.pdf Also, something I was interested in for boat batteries. Get a gasoline small engine and mount an automotive alternator, then you can have a portable battery charger that should be capable of some fairly high current. For Gunner's 8V batteries, I read about modifying the voltage regulators for alternators (the kind that have external regulators). IIRC, the basic idea was to control the output by controlling the power going to the rotor. That way the alternator, with the right voltage regulator, could be used to charge 8V batteries on up to 48V golf cart or fork truck batteries. http://www.smartgauge.co.uk/alt_mod.html http://www.madelectrical.com/electri...witworks.shtml RogerN |
#30
Posted to rec.crafts.metalworking
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Another battery charger question
On Sat, 1 Mar 2014 11:13:56 -0600, "RogerN" wrote:
"Tom Gardner" wrote in message m... I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. If you're interested in battery charger electronics you can look up some voltage regulator circuits. You can use an adjustable voltage regulator, such as an LM317, by setting the output voltage to what you want the maximum charge voltage to be, you can use it to charge a lead acid battery. By adding a resistor, low ohms and enough power for an amp or so, you can have the regulator lower the charge current while the battery gets nearer to full charge, like the lead acid battery chargers do. I read some interesting charging information about the "Battery Tender" maintenance charger, useful if you want to keep your seasonal batteries in good condition through the off season. I found a PDF file that, on page 4, shows the voltages that the battery tender operates at, "absorption charge" to 14.5 and maintenance charge of 13.2V. http://www.powerwerx.com/download/Pr...rproof_800.pdf Also, something I was interested in for boat batteries. Get a gasoline small engine and mount an automotive alternator, then you can have a portable battery charger that should be capable of some fairly high current. For Gunner's 8V batteries, I read about modifying the voltage regulators for alternators (the kind that have external regulators). IIRC, the basic idea was to control the output by controlling the power going to the rotor. That way the alternator, with the right voltage regulator, could be used to charge 8V batteries on up to 48V golf cart or fork truck batteries. http://www.smartgauge.co.uk/alt_mod.html http://www.madelectrical.com/electri...witworks.shtml RogerN Thanks for the links!! Gunner -- " I was once told by a “gun safety” advocate back in the Nineties that he favored total civilian firearms confiscation. Only the military and police should have weapons he averred and what did I think about that? I began to give him a reasoned answer and he cut me off with an abrupt, “Give me the short answer.” I thought for a moment and said, “If you try to take our firearms we will kill you.”" --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com |
#31
Posted to rec.crafts.metalworking
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Another battery charger question
On Sat, 01 Mar 2014 08:50:58 -0800, Gunner Asch
wrote: On Sat, 1 Mar 2014 09:01:29 -0500, "Jim Wilkins" wrote: "Tom Gardner" Mars@Tacks wrote in message om... On 3/1/2014 1:42 AM, Gunner Asch wrote: Just to link to 3..out of many many thousands Thanks! Once you are past the basics electronics subdivides into Analog, Digital, Communications and Power. If your concern is machine tools you could concentrate on Power components and circuits and don't need to go very far into the others, which you purchase as modules. Excellent point, Jim. A real timesaver, I'm sure. As a side note...I just wondered why Toms messages arent showing up. I kinda wondered if he was not on here that much anymore and then I see his messages in other peoples quotes. What the frack? He is not in my kill file. He hadn't been on for awhile and his email was dead for awhile, too. Doublecheck your filters for a plain old "tom", which I had done once. Some of my filters had dozens of ORs in them, so check closely. BTDT. -- Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air. -- John Quincy Adams |
#32
Posted to rec.crafts.metalworking
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Another battery charger question
"RogerN" wrote in message
... "Tom Gardner" wrote in message ... I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. If you're interested in battery charger electronics you can look up some voltage regulator circuits. You can use an adjustable voltage regulator, such as an LM317, by setting the output voltage to what you want the maximum charge voltage to be, you can use it to charge a lead acid battery. By adding a resistor, low ohms and enough power for an amp or so, you can have the regulator lower the charge current while the battery gets nearer to full charge, like the lead acid battery chargers do. I read some interesting charging information about the "Battery Tender" maintenance charger, useful if you want to keep your seasonal batteries in good condition through the off season. I found a PDF file that, on page 4, shows the voltages that the battery tender operates at, "absorption charge" to 14.5 and maintenance charge of 13.2V. http://www.powerwerx.com/download/Pr...rproof_800.pdf Also, something I was interested in for boat batteries. Get a gasoline small engine and mount an automotive alternator, then you can have a portable battery charger that should be capable of some fairly high current. For Gunner's 8V batteries, I read about modifying the voltage regulators for alternators (the kind that have external regulators). IIRC, the basic idea was to control the output by controlling the power going to the rotor. That way the alternator, with the right voltage regulator, could be used to charge 8V batteries on up to 48V golf cart or fork truck batteries. http://www.smartgauge.co.uk/alt_mod.html http://www.madelectrical.com/electri...witworks.shtml RogerN If you start playing with homebrew battery chargers this is a good meter to monitor the voltage: http://www.amazon.com/INNOVA-3721-Ba...s=innova+meter Digital meters aren't reliably accurate to one count, so "13.8V" could be anywhere from 13.70 to 13.99. This one should reduce the uncertainty to 13.79 - 13.81. Mine is quite accurate but I can't promise another will be as close. The lighter plug is safer than clip leads and you can put an outlet for it in the homebrew charger's front panel, or use the lighter outlet in the vehicle. This device is powered from the 12V input and unlike a DVM doesn't have internal batteries to run down if left on for days. It draws 8mA from the car battery, most of that probably for the display's useful backlight. jsw |
#33
Posted to rec.crafts.metalworking
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Another battery charger question
On Fri, 28 Feb 2014 22:44:17 -0800, Gunner Asch
wrote: On Wed, 26 Feb 2014 17:18:48 -0500, wrote: On Wed, 26 Feb 2014 14:33:33 -0600, Jon Elson wrote: Tom Gardner wrote: Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I went through this when stranded at a remote cabin with a car with a dead battery. Most of these smart chargers have some stupid secret code to "rejuvenate" a totally dead battery. You may have to push multiple buttons, hold for several seconds or whatever, and no way to figure it out without the manual. I had to play with that unit for MANY minutes before I was able to translate the Chinglish instructions into the right buttons to make it start charging. Jon The reason they won't charge a dead battery is the "polarity protection" circuit to prevent hooking the charger up backwards and doing damage to either the charger, the battery, or both. Ive had some..some luck hooking another battery in parallel with the dead one and the charger..and then removing the good battery. Gunner If the second battery has a reasonable charge and the dead battery isn't shorted, it SHOULD work every time. |
#34
Posted to rec.crafts.metalworking
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Another battery charger question
On Sat, 01 Mar 2014 09:53:39 -0800, Gunner Asch
wrote: On Sat, 1 Mar 2014 11:13:56 -0600, "RogerN" wrote: "Tom Gardner" wrote in message om... I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. If you're interested in battery charger electronics you can look up some voltage regulator circuits. You can use an adjustable voltage regulator, such as an LM317, by setting the output voltage to what you want the maximum charge voltage to be, you can use it to charge a lead acid battery. By adding a resistor, low ohms and enough power for an amp or so, you can have the regulator lower the charge current while the battery gets nearer to full charge, like the lead acid battery chargers do. I read some interesting charging information about the "Battery Tender" maintenance charger, useful if you want to keep your seasonal batteries in good condition through the off season. I found a PDF file that, on page 4, shows the voltages that the battery tender operates at, "absorption charge" to 14.5 and maintenance charge of 13.2V. http://www.powerwerx.com/download/Pr...rproof_800.pdf Also, something I was interested in for boat batteries. Get a gasoline small engine and mount an automotive alternator, then you can have a portable battery charger that should be capable of some fairly high current. For Gunner's 8V batteries, I read about modifying the voltage regulators for alternators (the kind that have external regulators). IIRC, the basic idea was to control the output by controlling the power going to the rotor. That way the alternator, with the right voltage regulator, could be used to charge 8V batteries on up to 48V golf cart or fork truck batteries. http://www.smartgauge.co.uk/alt_mod.html http://www.madelectrical.com/electri...witworks.shtml RogerN Thanks for the links!! Gunner Inserting a few diodes in the "sense" lead to the regulator will raise the charging voltage 3 silicone diodes will raise the voltage by aprox 2.1 volts - close enough to charge an 8 volt battery with a 6 volt regulator. |
#35
Posted to rec.crafts.metalworking
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Another battery charger question
On Thursday, February 27, 2014 10:11:23 PM UTC-6, Jim Wilkins wrote:
"Tom Gardner" Mars@Tacks wrote in message news On 2/26/2014 9:20 PM, RogerN wrote: "Tom Gardner" wrote in message ... Thanks for all the replies and knowledge. My other battery charger is a one pound electronic machine. It works OK, supplies 2, 6 and 12 amps and has all sorts of buttons and lights! What it won't do is charge a totally dead battery...thus repairing the old Craftsman. It displays: "BAD BATTERY" and I have to hook-up jumper cables from another vehicle to get a few percent of a charge to get the electronic charger to work. I also confess I don't know enough about electronics. Is there a good book to start with that isn't too stupid yet not over my head? I think I can still learn stuff. Comparing to piping, hydraulics, fluidics, pneumatics... Volts are pressure Amps is flow Resistance is opposition to flow, a restriction in the line. Power (watts) is the product of flow and pressure. Rectifiers are like check valves. capacitors are like storage tanks, accumulators or air tanks. transistors are like pilot operated valves AC would be kind of like a piston pump with no check valves, the power goes one way and then the other. So. using this back and forth fluid could drive a piston one size that is connected to a different size piston, either increasing pressure and decreasing volume, or increasing volume and decreasing pressure. That would be kind of like a transformer, it takes alternating current to make it work. So if you transformed your pumps force and pressure, it could be changed after the transformer by adding check valves at that point. The old fashioned battery charger transforms the line voltage to a lower voltage at a higher current. Then a rectifier causes it to flow only one way into the battery. Magnetic field going through a wire induces a voltage in the wire, not sure what that would compare to in hydraulics. The magnetic field inducing voltage has to do with transformers, motors, inductors, antenna, and other. RogerN Good analogies Roger! The water analogy of pressure = voltage, flow = current is useful when you are first learning about Direct Current circuits, but it falls apart quickly for Alternating Current because moving water's inertia isn't the same as inductance, and we don't have the hands-on intuitive experience with AC reversing flows that we do with DC garden hoses. The analogy that helps me with AC is imagining the pistons and crankshaft of an engine. The height of one piston represents the constantly changing voltage of one phase of the power line. If it was an equally spaced three-cylinder radial engine the other two pistons would be the other phases. The three pistons (voltages) combine their push in sequence to force a steady circular rotation of the crankshaft, which was Tesla's inspiration for introducing AC to spin motors without needing troublesome brushes. This makes more sense if you understand sines and cosines. Residential single-phase 120V is a one-cylinder engine and 240V is an opposed twin, like a BMW motorcycle. Since they can hang at top dead center they need a temporary circular push to start in the right direction, the reason why single phase AC motors need starting circuits but three phase ones don't. .jsw http://lpsa.swarthmore.edu/Analogs/E...alAnalogs.html |
#36
Posted to rec.crafts.metalworking
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Another battery charger question
On 2014-03-01, Gunner Asch wrote:
On Sat, 1 Mar 2014 09:01:29 -0500, "Jim Wilkins" wrote: "Tom Gardner" Mars@Tacks wrote in message om... [ ... ] As a side note...I just wondered why Toms messages arent showing up. I kinda wondered if he was not on here that much anymore and then I see his messages in other peoples quotes. What the frack? He is not in my kill file. Perhaps he *is*. I've had undesired killfiling thanks to various wildcarding. This is one reason I have things set up to always see the list of articles being killfiled along with the passed ones. Sometimes, I've never figured out why certain things wound up getting killed. :-) FWIW -- if you are using slrn, the trick to make the killed articles visible is to set the score to -9998 instead of the default -9999. They show up on my screen, at least, with the subject and poster in green instead of white. (And ones with *positive* scores show up in yellow, IIRC. And I kill both by poster (in certain cases) and by subject line, or part of the subject line. There is a command to force it to show you the line which killed a given file, but I have lines which really include a couple of hundred following lines, and it does not show me which of those following lines actually do the killing. :-( Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#37
Posted to rec.crafts.metalworking
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Another battery charger question
On 3/1/2014 1:10 PM, Larry Jaques wrote:
On Sat, 01 Mar 2014 08:50:58 -0800, Gunner Asch wrote: On Sat, 1 Mar 2014 09:01:29 -0500, "Jim Wilkins" wrote: "Tom Gardner" Mars@Tacks wrote in message ... On 3/1/2014 1:42 AM, Gunner Asch wrote: Just to link to 3..out of many many thousands Thanks! Once you are past the basics electronics subdivides into Analog, Digital, Communications and Power. If your concern is machine tools you could concentrate on Power components and circuits and don't need to go very far into the others, which you purchase as modules. Excellent point, Jim. A real timesaver, I'm sure. As a side note...I just wondered why Toms messages arent showing up. I kinda wondered if he was not on here that much anymore and then I see his messages in other peoples quotes. What the frack? He is not in my kill file. He hadn't been on for awhile and his email was dead for awhile, too. Doublecheck your filters for a plain old "tom", which I had done once. Some of my filters had dozens of ORs in them, so check closely. BTDT. -- Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air. -- John Quincy Adams Hmmm, nothing has changed here. No dead e-mail, still post on interesting threads...but those are few. This NG is close to being taken over by a few butt-brains. |
#38
Posted to rec.crafts.metalworking
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Another battery charger question
On 2014-03-01, Larry Jaques wrote:
On Sat, 01 Mar 2014 08:50:58 -0800, Gunner Asch wrote: On Sat, 1 Mar 2014 09:01:29 -0500, "Jim Wilkins" wrote: "Tom Gardner" Mars@Tacks wrote in message news:JO2dnWqGtdLxM4zOnZ2dnUVZ_vidnZ2d@giganews. com... On 3/1/2014 1:42 AM, Gunner Asch wrote: Just to link to 3..out of many many thousands Thanks! Once you are past the basics electronics subdivides into Analog, Digital, Communications and Power. If your concern is machine tools you could concentrate on Power components and circuits and don't need to go very far into the others, which you purchase as modules. Excellent point, Jim. A real timesaver, I'm sure. Another place to learn electronics (though with a different focus) is in preparing for the FCC ham radio exams. Especially the first level (technician) covers a lot of the basics. (Along with lots of rules as to what you can and can't do with your license once you pass the test -- since it is government, there are *lots* of things which become rules. :-) But it also gets you started on reading schematic symbols and such. The second level -- (general) covers more in the way of calculating what is what, as well as more general knowledge. And the third level -- (extra) covers a lot more detailed calculations (if you have an inductor of value 'X', a capacitor of value 'Y', and a resistor of value 'Z' in series, and apply a frequency of 'J' MHz, what is the phase relationship between current and voltage. You even get introduced to weird things like "Smith charts" -- a graphical way of calculating complex math at high RF frequencies. I forget which level it is which starts identifying what various logic circuits do. And -- yes, you have to pass the lower level exams before you can take the next level. Technician -- 30 questions. General -- 30 more questions. "extra" -- 50 more questions -- for a total of 110 questions for the three exams combined. But -- unless you want to be a ham -- you don't need to *take* the exams (though they are a good way to figure out what you need to study more of) and you can take them on line as practice exams, with questions drawn from the same pool as the for real exams, but just a computer grading you. I went through about a month or so of trying the practice exams before I went into the real ones. And I learned a lot form what I got wrong in those practice exams. I had been an electronics technician for a long time, so just taking the practice exams worked for me -- just to remind me of the things which I had forgotten. If you aren't starting from that point, then the study books from ARRL (or others) would be a good idea. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#39
Posted to rec.crafts.metalworking
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Another battery charger question
On 2014-03-01, wrote:
On Sat, 01 Mar 2014 09:53:39 -0800, Gunner Asch wrote: On Sat, 1 Mar 2014 11:13:56 -0600, "RogerN" wrote: [ ... ] Also, something I was interested in for boat batteries. Get a gasoline small engine and mount an automotive alternator, then you can have a portable battery charger that should be capable of some fairly high current. For Gunner's 8V batteries, I read about modifying the voltage regulators for alternators (the kind that have external regulators). IIRC, the basic idea was to control the output by controlling the power going to the rotor. That way the alternator, with the right voltage regulator, could be used to charge 8V batteries on up to 48V golf cart or fork truck batteries. http://www.smartgauge.co.uk/alt_mod.html http://www.madelectrical.com/electri...witworks.shtml RogerN Thanks for the links!! Gunner Inserting a few diodes in the "sense" lead to the regulator will raise the charging voltage 3 silicone diodes will raise the voltage by aprox 2.1 volts - close enough to charge an 8 volt battery with a 6 volt regulator. Hmm ... if an 8V battery were a *true* 8V -- yes. However, since the 8V lead-acidej battery is four nominal 2.2V cells, that will really be 8.8V charged, and closer to 9.6V under charge, depending on temperature, so you want to boost that regulator's output by 3.6V -- about five diodes total. And it would be nice to have a current limit in the regulator chip too, just to be safe. :-) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#40
Posted to rec.crafts.metalworking
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Another battery charger question
On Sat, 01 Mar 2014 21:28:13 -0500, Tom Gardner Mars@Tacks wrote:
On 3/1/2014 1:10 PM, Larry Jaques wrote: On Sat, 01 Mar 2014 08:50:58 -0800, Gunner Asch wrote: On Sat, 1 Mar 2014 09:01:29 -0500, "Jim Wilkins" wrote: "Tom Gardner" Mars@Tacks wrote in message ... On 3/1/2014 1:42 AM, Gunner Asch wrote: Just to link to 3..out of many many thousands Thanks! Once you are past the basics electronics subdivides into Analog, Digital, Communications and Power. If your concern is machine tools you could concentrate on Power components and circuits and don't need to go very far into the others, which you purchase as modules. Excellent point, Jim. A real timesaver, I'm sure. As a side note...I just wondered why Toms messages arent showing up. I kinda wondered if he was not on here that much anymore and then I see his messages in other peoples quotes. What the frack? He is not in my kill file. He hadn't been on for awhile and his email was dead for awhile, too. Doublecheck your filters for a plain old "tom", which I had done once. Some of my filters had dozens of ORs in them, so check closely. BTDT. -- Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air. -- John Quincy Adams Hmmm, nothing has changed here. No dead e-mail, still post on interesting threads...but those are few. This NG is close to being taken over by a few butt-brains. Your back!! I flushed the kill file and you came back!! Yay!!!! -- " I was once told by a “gun safety” advocate back in the Nineties that he favored total civilian firearms confiscation. Only the military and police should have weapons he averred and what did I think about that? I began to give him a reasoned answer and he cut me off with an abrupt, “Give me the short answer.” I thought for a moment and said, “If you try to take our firearms we will kill you.”" --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com |
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