Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
Hi,
Over the years, I've kept a few ATX power supply from old computers. Now, I'm thinking about upgrading my computer and add more hard disks. The problem is the current power supply might not be able to support so many hard disks running at the same time. Instead of buying a new, more powerful power supply, I am planning to use one old piece (350w) to serve the motherboard, CD, and 3 hard disks, then another power supply (350w too) to serve 3 to 4 more hard disks. All components are connected to the same motherboard. I need to know how I could turn on both power supply with a single press of the power button on the case. In other words, only one power supply can plug to the motherboard, how can I jam the wires together so that the second power supply receive the power-on signal when I press the button? I was thinking about the Power-On (Green), Power-Good (Gray) and 5 VSB (Purple) wires. the second power supply would only support the hard disks and nothing else, but I need them to be powered up at the same time other hardware are up (and down when it's shut down). Thanks. |
#2
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
green wire to black ground starts them up, but put
a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. "lee" wrote in message ... Hi, Over the years, I've kept a few ATX power supply from old computers. Now, I'm thinking about upgrading my computer and add more hard disks. The problem is the current power supply might not be able to support so many hard disks running at the same time. Instead of buying a new, more powerful power supply, I am planning to use one old piece (350w) to serve the motherboard, CD, and 3 hard disks, then another power supply (350w too) to serve 3 to 4 more hard disks. All components are connected to the same motherboard. I need to know how I could turn on both power supply with a single press of the power button on the case. In other words, only one power supply can plug to the motherboard, how can I jam the wires together so that the second power supply receive the power-on signal when I press the button? I was thinking about the Power-On (Green), Power-Good (Gray) and 5 VSB (Purple) wires. the second power supply would only support the hard disks and nothing else, but I need them to be powered up at the same time other hardware are up (and down when it's shut down). Thanks. |
#3
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
"crazy frog" writes:
green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#4
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
lee wrote:
Hi, Over the years, I've kept a few ATX power supply from old computers. Now, I'm thinking about upgrading my computer and add more hard disks. The problem is the current power supply might not be able to support so many hard disks running at the same time. Instead of buying a new, more powerful power supply, I am planning to use one old piece (350w) to serve the motherboard, CD, and 3 hard disks, then another power supply (350w too) to Do the numbers. Only 8 should not be a problem, if it's a real 350W. 15W * 8 = only 120W. Add another 100W for the motherboard, and you're pretty much fine. Also. You'll want to do the numbers on life cycle cost. Yes, you may have 3 80G drives spare, that you can stick into a system. If you're going to be leaving them on (which increases drive life), then in some places, you'll pay for a new 240G drive in a couple of years. |
#5
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
Thanks and I did my numbers:
I'm thinking a P4 9xx CPU and it draws around 100w alone, new display cards (ATI x series) also draws a lot of power. More than 1 web site said hard disks draws 25w so I use that in my calculation to be on the safe side. Plus RAM, DVD-RW, fans, and USB devices that might connect to the machine every now and then. Each of those costs little but they add up. 350w might not be sufficient all the time. In addition, I don't trust the PSU will produce 350w as claimed by the manufacturer. In the meanwhile, thank you for everyone's help in this. Best regards. "Ian Stirling" wrote in message ... lee wrote: Hi, Over the years, I've kept a few ATX power supply from old computers. Now, I'm thinking about upgrading my computer and add more hard disks. The problem is the current power supply might not be able to support so many hard disks running at the same time. Instead of buying a new, more powerful power supply, I am planning to use one old piece (350w) to serve the motherboard, CD, and 3 hard disks, then another power supply (350w too) to Do the numbers. Only 8 should not be a problem, if it's a real 350W. 15W * 8 = only 120W. Add another 100W for the motherboard, and you're pretty much fine. Also. You'll want to do the numbers on life cycle cost. Yes, you may have 3 80G drives spare, that you can stick into a system. If you're going to be leaving them on (which increases drive life), then in some places, you'll pay for a new 240G drive in a couple of years. |
#6
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
lee wrote:
Hi, Over the years, I've kept a few ATX power supply from old computers. Now, I'm thinking about upgrading my computer and add more hard disks. The problem is the current power supply might not be able to support so many hard disks running at the same time. Instead of buying a new, more powerful power supply, I am planning to use one old piece (350w) to serve the motherboard, CD, and 3 hard disks, then another power supply (350w too) to serve 3 to 4 more hard disks. All components are connected to the same motherboard. I need to know how I could turn on both power supply with a single press of the power button on the case. In other words, only one power supply can plug to the motherboard, how can I jam the wires together so that the second power supply receive the power-on signal when I press the button? I was thinking about the Power-On (Green), Power-Good (Gray) and 5 VSB (Purple) wires. the second power supply would only support the hard disks and nothing else, but I need them to be powered up at the same time other hardware are up (and down when it's shut down). Thanks. There's a lot of wattage inflation these days, following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. |
#7
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
James Sweet writes:
There's a lot of wattage inflation these days, following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. Don't fight it. People think that adding power supplies multiples the speed of the PC by the number of power supplies added. No way to talk them out of it. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#8
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
im useing a supply with no mobo
and 100ohm works fine. "Sam Goldwasser" wrote in message ... "crazy frog" writes: green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#9
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
got the info from silicon chip.
"crazy frog" wrote in message u... im useing a supply with no mobo and 100ohm works fine. "Sam Goldwasser" wrote in message ... "crazy frog" writes: green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#10
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
no not all, look at silicon chips artical
"Sam Goldwasser" wrote in message ... "crazy frog" writes: im useing a supply with no mobo and 100ohm works fine. And so you think this applies equally well to ALL power supplies? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. "Sam Goldwasser" wrote in message ... "crazy frog" writes: green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. |
#11
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
how do you think my power supply is working.
"crazy frog" wrote in message ... no not all, look at silicon chips artical "Sam Goldwasser" wrote in message ... "crazy frog" writes: im useing a supply with no mobo and 100ohm works fine. And so you think this applies equally well to ALL power supplies? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. "Sam Goldwasser" wrote in message ... "crazy frog" writes: green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. |
#12
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
"crazy frog" writes:
no not all, look at silicon chips artical Perhaps a link? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. "Sam Goldwasser" wrote in message ... "crazy frog" writes: im useing a supply with no mobo and 100ohm works fine. And so you think this applies equally well to ALL power supplies? "Sam Goldwasser" wrote in message ... "crazy frog" writes: green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. |
#13
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
www.siliconchip.com.au
"Sam Goldwasser" wrote in message ... "crazy frog" writes: no not all, look at silicon chips artical Perhaps a link? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. "Sam Goldwasser" wrote in message ... "crazy frog" writes: im useing a supply with no mobo and 100ohm works fine. And so you think this applies equally well to ALL power supplies? "Sam Goldwasser" wrote in message ... "crazy frog" writes: green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. |
#14
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
cant fined the old article on pc power
supplies. thay hav a new one on useing them as a 13v high power unit without a pc connected. "crazy frog" wrote in message u... www.siliconchip.com.au "Sam Goldwasser" wrote in message ... "crazy frog" writes: no not all, look at silicon chips artical Perhaps a link? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. "Sam Goldwasser" wrote in message ... "crazy frog" writes: im useing a supply with no mobo and 100ohm works fine. And so you think this applies equally well to ALL power supplies? "Sam Goldwasser" wrote in message ... "crazy frog" writes: green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. 100 ohms may be too high. 5 ohms probably better. But an automotive taillight (incandescent) or dead harddrive also should work. |
#15
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
"crazy frog" writes:
www.siliconchip.com.au What article? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#16
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
crazy frog wrote:
green wire to black ground starts them up, but put a load on them first like youre drives. only the motherboard needs power good. if running with no load, use a 5watt 100ohm resistor accross the 5v+ to black ground for a dummy load. Lets do a bit of maths. 5 V across 100 Ohms is 5^2 / 100 = 25 / 100 = 0.25 W. So you would only need 1/4 W restor, not a 5 W one. However, like someone else, i think that would be totally inadequate as a minimum load. "lee" wrote in message ... Hi, Over the years, I've kept a few ATX power supply from old computers. Now, I'm thinking about upgrading my computer and add more hard disks. The problem is the current power supply might not be able to support so many hard disks running at the same time. Instead of buying a new, more powerful power supply, I am planning to use one old piece (350w) to serve the motherboard, CD, and 3 hard disks, then another power supply (350w too) to serve 3 to 4 more hard disks. All components are connected to the same motherboard. I need to know how I could turn on both power supply with a single press of the power button on the case. In other words, only one power supply can plug to the motherboard, how can I jam the wires together so that the second power supply receive the power-on signal when I press the button? I was thinking about the Power-On (Green), Power-Good (Gray) and 5 VSB (Purple) wires. the second power supply would only support the hard disks and nothing else, but I need them to be powered up at the same time other hardware are up (and down when it's shut down). Thanks. -- Dave K MCSE. MCSE = Minefield Consultant and Solitaire Expert. Please note my email address changes periodically to avoid spam. It is always of the form: month-year@domain. Hitting reply will work for a couple of months only. Later set it manually. |
#17
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
James Sweet wrote:
There's a lot of wattage inflation these days, True. following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. But I don't belive that 250 W drawn from the mains is a likely maximum now. I was doing some calculuations the other day based on a pair of Opterons. According to AMD, they are about 100 W each. A very mediocre graphics card is probably 30 W. Disks take more when they spin up. 350 W is probably adequate for most things I would agree. My main PC (I don't use PCs much) has a 235 W power supply in it, but a pair of 450 MHz Pentiums and a 10,000 rpm SCSI disk. That seems to be OK A more elegant solution if there are multiple disks might be to build a timer that delays the starts on them, as the power when running is probalby only half that when starting. Personally, I think I'd just rather buy a bigger psu - they are not that expensive now. -- Dave K MCSE. MCSE = Minefield Consultant and Solitaire Expert. Please note my email address changes periodically to avoid spam. It is always of the form: month-year@domain. Hitting reply will work for a couple of months only. Later set it manually. |
#18
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
On Sun, 26 Mar 2006 19:48:42 GMT, James Sweet
put finger to keyboard and composed: The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. I've measured ~175W for my single HDD, Athlon XP 2500+ system. These are my idling and standby power consumption data: http://groups.google.com/group/alt.c...e=source&hl=en - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#19
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
Dave (from the UK) wrote:
James Sweet wrote: There's a lot of wattage inflation these days, True. following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. But I don't belive that 250 W drawn from the mains is a likely maximum now. I was doing some calculuations the other day based on a pair of Opterons. According to AMD, they are about 100 W each. A very mediocre graphics card is probably 30 W. Disks take more when they spin up. 350 W is probably adequate for most things I would agree. My main PC (I don't use PCs much) has a 235 W power supply in it, but a pair of 450 MHz Pentiums and a 10,000 rpm SCSI disk. That seems to be OK A more elegant solution if there are multiple disks might be to build a timer that delays the starts on them, as the power when running is probalby only half that when starting. Personally, I think I'd just rather buy a bigger psu - they are not that expensive now. How many people have a pair of Opterons though? I thought we were talking consumer PCs? |
#20
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
log on to siliconchip type in pc power supplies
into the article search box, it will take you to the new article,s but not the old one for the dummy loads. i asked them for it but thay wont to charge me. i will see if ican fined it in my folders. "Sam Goldwasser" wrote in message ... "crazy frog" writes: www.siliconchip.com.au What article? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#21
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
"crazy frog" writes:
thats what i read from silicon chip and have done so and it works fine. im useing a 200w one to power a 16/ch mixer i have built in the last 2 years. im useing a nother one power my modem and network hub and some fans. http://www.formfactors.org/developer...public_br2.pdf This appears to be Intel's ATX specifications. It is not clear what minimum load is required for proper regulation. Under "DC Voltage Regulation", it says: "The DC output voltages shall remain within the regulation ranges shown in Table 2 when measured at the load end of the output connectors under all line, load, and environmental conditions." Later on in: "No Load Operation", it says: "No damage or hazardous condition should occur with all the DC output connectors disconnected from the load. The power supply may latch into the shutdown state." Loading examples never go below 1 A on +12, 0.3 A on +5, 0.5 A on +3.3. So, it shouldn't blow up under very light or no load conditions, but the exact values needed for proper operation may not be obvious. And, the existence of this specification document doesn't necessarily imply that all Far East ATX power supplies are fully compliant. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#22
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
lee wrote:
Thanks and I did my numbers: I'm thinking a P4 9xx CPU and it draws around 100w alone, new display cards (ATI x series) also draws a lot of power. More than 1 web site said hard disks draws 25w so I use that in my calculation to be on the safe side. Don't believe 'more than one website'. Look at the specs for your drives. The makers website will list exact startup currents. |
#23
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
i think you need some load to make it regulate properly
"Sam Goldwasser" wrote in message ... "crazy frog" writes: thats what i read from silicon chip and have done so and it works fine. im useing a 200w one to power a 16/ch mixer i have built in the last 2 years. im useing a nother one power my modem and network hub and some fans. http://www.formfactors.org/developer..._public_br2.pd f This appears to be Intel's ATX specifications. It is not clear what minimum load is required for proper regulation. Under "DC Voltage Regulation", it says: "The DC output voltages shall remain within the regulation ranges shown in Table 2 when measured at the load end of the output connectors under all line, load, and environmental conditions." Later on in: "No Load Operation", it says: "No damage or hazardous condition should occur with all the DC output connectors disconnected from the load. The power supply may latch into the shutdown state." Loading examples never go below 1 A on +12, 0.3 A on +5, 0.5 A on +3.3. So, it shouldn't blow up under very light or no load conditions, but the exact values needed for proper operation may not be obvious. And, the existence of this specification document doesn't necessarily imply that all Far East ATX power supplies are fully compliant. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#24
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
the article im talking obout is for at power sups
and cannot fined it online, i had it someware will try to fined it. "crazy frog" wrote in message u... i think you need some load to make it regulate properly "Sam Goldwasser" wrote in message ... "crazy frog" writes: thats what i read from silicon chip and have done so and it works fine. im useing a 200w one to power a 16/ch mixer i have built in the last 2 years. im useing a nother one power my modem and network hub and some fans. http://www.formfactors.org/developer..._public_br2.pd f This appears to be Intel's ATX specifications. It is not clear what minimum load is required for proper regulation. Under "DC Voltage Regulation", it says: "The DC output voltages shall remain within the regulation ranges shown in Table 2 when measured at the load end of the output connectors under all line, load, and environmental conditions." Later on in: "No Load Operation", it says: "No damage or hazardous condition should occur with all the DC output connectors disconnected from the load. The power supply may latch into the shutdown state." Loading examples never go below 1 A on +12, 0.3 A on +5, 0.5 A on +3.3. So, it shouldn't blow up under very light or no load conditions, but the exact values needed for proper operation may not be obvious. And, the existence of this specification document doesn't necessarily imply that all Far East ATX power supplies are fully compliant. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#25
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
i found the artile, its from december 1998
silicon chip. on front page is has make use of that old pc power supply. min load 47ohm 1 watt resistor, ive tested it up to 100ohm and is ok. "Sam Goldwasser" wrote in message ... James Sweet writes: There's a lot of wattage inflation these days, following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. Don't fight it. People think that adding power supplies multiples the speed of the PC by the number of power supplies added. No way to talk them out of it. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#26
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
"crazy frog" writes:
i found the artile, its from december 1998 silicon chip. on front page is has make use of that old pc power supply. min load 47ohm 1 watt resistor, ive tested it up to 100ohm and is ok. So what? Does it say the specification allows for that high a resistor or just that someone did a project and it worked, and you did a project and it worked? The article doesn't appear to be archived, so are you going to share what it says? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. "Sam Goldwasser" wrote in message ... James Sweet writes: There's a lot of wattage inflation these days, following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. Don't fight it. People think that adding power supplies multiples the speed of the PC by the number of power supplies added. No way to talk them out of it. |
#27
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
i sed i tested it up to 100ohm.
if you dont beleave me, just bloody try it. look i have done it and it works. the ****in aticle is in my hand. if dont beleave me then, its youre bloody loss. "Sam Goldwasser" wrote in message ... "crazy frog" writes: i found the artile, its from december 1998 silicon chip. on front page is has make use of that old pc power supply. min load 47ohm 1 watt resistor, ive tested it up to 100ohm and is ok. So what? Does it say the specification allows for that high a resistor or just that someone did a project and it worked, and you did a project and it worked? The article doesn't appear to be archived, so are you going to share what it says? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. "Sam Goldwasser" wrote in message ... James Sweet writes: There's a lot of wattage inflation these days, following the stereo equipment makers in the 80s. The fact of the matter is that if you have a *quality* 300 or 350W power supply, it should run just about anything you can fit in the computer. I've measured a number of computers with a power analyzer and I have yet to see one which draws more than 250W from the wall under full load, most typical single CPU computers are down around 160-180W even with multiple hard drives. Don't fight it. People think that adding power supplies multiples the speed of the PC by the number of power supplies added. No way to talk them out of it. |
#28
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
"crazy frog" writes:
i sed i tested it up to 100ohm. if you dont beleave me, just bloody try it. look i have done it and it works. the ****in aticle is in my hand. if dont beleave me then, its youre bloody loss. And you've tried it on how many different manufacturer's power supplies? You can contact me via the link below. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#29
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
yes i have
"Sam Goldwasser" wrote in message ... "crazy frog" writes: i sed i tested it up to 100ohm. if you dont beleave me, just bloody try it. look i have done it and it works. the ****in aticle is in my hand. if dont beleave me then, its youre bloody loss. And you've tried it on how many different manufacturer's power supplies? You can contact me via the link below. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#30
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
how do i send the pages of the artile.
how do attach them. do you have a email address to send them. like a hotmail. "crazy frog" wrote in message u... yes i have "Sam Goldwasser" wrote in message ... "crazy frog" writes: i sed i tested it up to 100ohm. if you dont beleave me, just bloody try it. look i have done it and it works. the ****in aticle is in my hand. if dont beleave me then, its youre bloody loss. And you've tried it on how many different manufacturer's power supplies? You can contact me via the link below. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#31
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
"crazy frog" writes:
how do i send the pages of the artile. how do attach them. do you have a email address to send them. like a hotmail. You contact me via my Web site and I'll reply with a valid email address. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#32
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
ok but im not soure if silicon chip will
let send copies of ther aticles based on copyright laws. "Sam Goldwasser" wrote in message ... "crazy frog" writes: how do i send the pages of the artile. how do attach them. do you have a email address to send them. like a hotmail. You contact me via my Web site and I'll reply with a valid email address. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#33
Posted to sci.electronics.repair
|
|||
|
|||
combining 2 power supplies
the silicon chip aricles are copyright
i cannot send it. but just take my word for it. 47ohm to 100ohm. or you will have to log on to them and ask them. sorry about that. "crazy frog" wrote in message u... ok but im not soure if silicon chip will let send copies of ther aticles based on copyright laws. "Sam Goldwasser" wrote in message ... "crazy frog" writes: how do i send the pages of the artile. how do attach them. do you have a email address to send them. like a hotmail. You contact me via my Web site and I'll reply with a valid email address. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
MIG welding with DC power supplies | Metalworking | |||
MIG welding with DC power supplies | Metalworking | |||
Underground wiring questions... | Home Repair | |||
Generator FAQ | Metalworking |