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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. |
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#1
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Isolation transformer source
Can anyone recommend a good isolation transformer for sale on-line?
Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. |
#2
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Isolation transformer source
In article ,
JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... I'm in the UK so it's 240 volts, but found it a lot cheaper to buy the transformer bare and box it up myself. They're not a mass produced device like say a 240 - 110 type so that may be the reason. They used to be common for stage etc use, but RCDs etc seem to have replaced them. As well as safer electronic instrument design. They might well come up on Ebay secondhand, though. -- *When cheese gets its picture taken, what does it say? * Dave Plowman London SW To e-mail, change noise into sound. |
#3
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Isolation transformer source
JW wrote:
Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. http://www.news-leader.com/article/2...elor-sentenced A former camp counselor who pleaded guilty to sexually abusing several children received two life sentences plus 30 years in prison on Wednesday. Peter D. Newman, who worked at Kanakuk Kamps near Branson, was given the sentence by Circuit Judge Mark Orr in Taney County after testimony from a pair of psychologists, a Kanakuk staff member, a friend of Newman's, two of his brothers and Newman himself. Victims and their families did not testify at the hearing. They had submitted written statements to Orr at an earlier time. Newman had pleaded guilty in February to three counts of second-degree statutory sodomy, two counts of first-degree statutory sodomy and two counts of enticement of a child. According to court records, Newman enticed children to join him for "Bible studies" in a hot tub where they would engage in mutual masturbation. At least one other victim said he and Newman performed oral and anal sex on each other. The victim also described Newman as his "spiritual mentor." The abuse began when Newman first became a counselor in 1999 and continued until 2009 when he was fired after camp administrators learned of the allegations. Newman's eight charges ultimately involved activity with six children. However, Merrell said after the sentencing that Newman had admitted to sexual activity with 13 other children as well. Many families chose not to get involved. "We won't try to force families to come forward," Merrell said. "Particularly considering today's sentence." Newman's attorney, Tom Carver, said he was disappointed in the outcome. "I think it was a pretty severe sentence, given Pete's promising ability to be amenable to treatment," he said. A psychologist specializing in sex offender issues, Joseph Plaud, had testified that Newman was a good candidate for treatment. Another psychologist, Anna Salter, who testified for the state, said that Newman could pose a danger because he had been able to abuse children for a decade without being caught. Newman also spoke to the judge and apologized for his actions. "I was supposed to model Christ and I didn't," he said, fighting back tears. "I made him look bad." Taney County Prosecutor Jeff Merrell told Orr that Newman was "the most prolific child molester" he's been aware of. Taney County Sheriff Jimmie Russell said it was a difficult case to investigate, both personally and logistically. "It's hard on the investigators, the families and the victims," he said. He said he was satisfied with the sentence and that it makes a strong message to the community that Newman's behavior is not tolerated. "What's upsetting is that he used religion to groom these kids for his sexual gratification," he said. "That's very upsetting." Merrell could not specify when Newman would be eligible for parole, but he said it would be a long time. Newman still could face charges in Colorado where he committed some of his crimes at another Kanakuk camp. |
#4
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Isolation transformer source
JW wrote:
Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. I think the $100 and "good quality" exclude each other for a transformer that size. the smaller units as used with cash registers and POS systems tend to max out at 4 amps. is used is ok, look for stuff from acme, topaz, oneac, shape, powervar. powervar even had some interesting ones based off toroidal tranformers if you want the ooh and aah factor. |
#5
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Isolation transformer source
In article ,
Cydrome Leader wrote: JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. I think the $100 and "good quality" exclude each other for a transformer that size. A 625VA toroidal in the UK would cost about 50 gbp as a bare unit. Slightly more for a one off. -- *Never underestimate the power of stupid people in large groups. Dave Plowman London SW To e-mail, change noise into sound. |
#6
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Isolation transformer source
In article , Cydrome Leader wrote:
JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. I think the $100 and "good quality" exclude each other for a transformer that size. the smaller units as used with cash registers and POS systems tend to max out at 4 amps. is used is ok, look for stuff from acme, topaz, oneac, shape, powervar. powervar even had some interesting ones based off toroidal tranformers if you want the ooh and aah factor. Not cheap. Surplus Sales of Nebraska has some. Depending on what your going to do, check if it has the secondary to ground bonding which you should remove if you are seaking ground isolation. greg |
#7
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Isolation transformer source
GregS wrote:
In article , Cydrome Leader wrote: JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. I think the $100 and "good quality" exclude each other for a transformer that size. the smaller units as used with cash registers and POS systems tend to max out at 4 amps. is used is ok, look for stuff from acme, topaz, oneac, shape, powervar. powervar even had some interesting ones based off toroidal tranformers if you want the ooh and aah factor. Not cheap. Surplus Sales of Nebraska has some. I'd avoid surplus sales. Why pay twice new prices for old stuff when you don't have to? It's an interesting place browse, and I've been there in person, but the ripoff factor is pretty incredible. |
#8
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Isolation transformer source
On 6/10/2010 4:57 PM, Cydrome Leader wrote:
wrote: In , Cydrome wrote: wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. I think the $100 and "good quality" exclude each other for a transformer that size. the smaller units as used with cash registers and POS systems tend to max out at 4 amps. is used is ok, look for stuff from acme, topaz, oneac, shape, powervar. powervar even had some interesting ones based off toroidal tranformers if you want the ooh and aah factor. Not cheap. Surplus Sales of Nebraska has some. I'd avoid surplus sales. Why pay twice new prices for old stuff when you don't have to? It's an interesting place browse, and I've been there in person, but the ripoff factor is pretty incredible. Surplus sales has its place in the food chain. Its NOT a salvage place that just haphazardly throws stuff in piles, its all gone through sorted,labeled and cataloged. Lots of nice old ham gear stuff if you into it. Yea, most of it is not cheap. but try to find some of it from other sources. Some of the stuff they have will NEVER sell at the prices they have it at. Everyone knows how hot tube oscilloscopes are..... With the number of shops closing, i would wait for a going out of business sale or Ebay. bob |
#9
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Isolation transformer source
bob wrote:
On 6/10/2010 4:57 PM, Cydrome Leader wrote: wrote: In , Cydrome wrote: wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. I think the $100 and "good quality" exclude each other for a transformer that size. the smaller units as used with cash registers and POS systems tend to max out at 4 amps. is used is ok, look for stuff from acme, topaz, oneac, shape, powervar. powervar even had some interesting ones based off toroidal tranformers if you want the ooh and aah factor. Not cheap. Surplus Sales of Nebraska has some. I'd avoid surplus sales. Why pay twice new prices for old stuff when you don't have to? It's an interesting place browse, and I've been there in person, but the ripoff factor is pretty incredible. Surplus sales has its place in the food chain. Its NOT a salvage place that just haphazardly throws stuff in piles, its all gone through sorted,labeled and cataloged. Lots of nice old ham gear stuff if you into it. Yea, most of it is not cheap. but try to find some of it from other sources. Some of the stuff they have will NEVER sell at the prices they have it at. Everyone knows how hot tube oscilloscopes are..... With the number of shops closing, i would wait for a going out of business sale or Ebay. bob I think the whole basis for surplus sales is the guy has a really large building, and can store infinite amounts of crap inside it forever. Storing something there for decades doesn't seem to waste any space or compete with shelf space for stuff that does sell. It's a fun place to checkout if you're ever in Omaha. Lots of stuff on the floor you can walk around isn't on the website. Unfortunately the next best place like that that was in chicago called the Radio TV Lab closed years ago. It was a serious time machine in there. The guy had NIB replacement parts for wire recorders- and not ones from planes, but from before magnetic tape worked at all, plus service guides for pretty much anything with tubes in it. Getting in and out of the shop was a single file line type operation and people having to all leave to let customers out wasn't uncommon. Stuff was stacked to the ceilings in every direction. If you needed a part that wasn't current it was there. Maybe somebody here knows what this- He had some sort of capacitor that looked like a large can electrolytic but it was filled with liquid that sloshed around. I don't recall the ratings at all. It was explained that if shaken, and if the case started to feel colder the cap was still good, sort of like an chemical ice pack. Does anybody have any idea what sort of capacitor this was? |
#10
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Isolation transformer source
"JW" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. 2. Neutral conductor isolation. Most you see offered for sale in the USA are of the *second* kind. ..... Phil |
#11
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Isolation transformer source
In article ,
Phil Allison wrote: "JW" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. 2. Neutral conductor isolation. Most you see offered for sale in the USA are of the *second* kind. .... Phil Surely an isolation transformer is just that - a one to one device with DC isolation between windings. How it is subsequently configured is a different matter. One use is where you can't be sure the line and neutral of the supply are connected correctly - if they have a ground reference. -- *To be intoxicated is to feel sophisticated, but not be able to say it. Dave Plowman London SW To e-mail, change noise into sound. |
#12
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Isolation transformer source
In article , "Dave Plowman (News)" wrote:
In article , Phil Allison wrote: "JW" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. 2. Neutral conductor isolation. Most you see offered for sale in the USA are of the *second* kind. .... Phil Surely an isolation transformer is just that - a one to one device with DC isolation between windings. How it is subsequently configured is a different matter. One use is where you can't be sure the line and neutral of the supply are connected correctly - if they have a ground reference. An isolation transfor is typically 1:1.1 in real life. Its acts as 1:1 with FULL load. Well all transformers are rated FULL LOAD. They really need to start calling these things different names. A regular "isolation transformer", and they should not be calling it that, is NOT ground isolated since the secondary is tied to ground. The purpose of this transformer is noise reduction, period, using an isolation transformer. Find another name. greg |
#13
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Isolation transformer source
In article ,
GregS wrote: They really need to start calling these things different names. A regular "isolation transformer", and they should not be calling it that, is NOT ground isolated since the secondary is tied to ground. The purpose of this transformer is noise reduction, period, using an isolation transformer. In the UK the secondary of a (safety) isolating transformer is *not* tied to ground - that would entirely defeat the purpose. So someone needs to invent a new name for your type. ;-) -- *Funny, I don't remember being absent minded. Dave Plowman London SW To e-mail, change noise into sound. |
#14
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Isolation transformer source
"Dave Plowman "Pommy Nutcase" Phil Allison "JW" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. 2. Neutral conductor isolation. Most you see offered for sale in the USA are of the *second* kind. Surely an isolation transformer is just that... ** Shame it is not in the USA - you steaming great ****wit. .... Phil |
#15
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Isolation transformer source
In article ,
Phil Allison wrote: Surely an isolation transformer is just that... ** Shame it is not in the USA - you steaming great ****wit. Given your supreme command of the English language it's not a surprise you don't understand what 'isolate' means... -- *I don't suffer from insanity -- I'm a carrier Dave Plowman London SW To e-mail, change noise into sound. |
#16
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Isolation transformer source
"Dave Plowman " Rabid Pommy Nutcase" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. 2. Neutral conductor isolation. Most you see offered for sale in the USA are of the *second* kind. Surely an isolation transformer is just that... ** Shame it is not so in the USA - you Steaming Great ****wit ............... .... Phil |
#17
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Isolation transformer source
On Fri, 11 Jun 2010 10:30:56 +1000 "Phil Allison"
wrote in Message id: : "JW" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. Galvanic. Thanks - didn't realize there are different kinds. Don't want to kill myself! |
#18
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Isolation transformer source
In article ,
JW wrote: On Fri, 11 Jun 2010 10:30:56 +1000 "Phil Allison" wrote in Message id: : "JW" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. Galvanic. Thanks - didn't realize there are different kinds. Don't want to kill myself! It certainly seems to me stupid to have the same name for different devices like this. What is the point of an isolating transformer which doesn't isolate? -- *When a clock is hungry it goes back four seconds* Dave Plowman London SW To e-mail, change noise into sound. |
#19
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Isolation transformer source
In article , "Dave Plowman (News)" wrote:
In article , JW wrote: On Fri, 11 Jun 2010 10:30:56 +1000 "Phil Allison" wrote in Message id: : "JW" Can anyone recommend a good isolation transformer for sale on-line? ** What kind ?? There are two: 1. Galvanic isolation - for use on a service bench. Galvanic. Thanks - didn't realize there are different kinds. Don't want to kill myself! It certainly seems to me stupid to have the same name for different devices like this. What is the point of an isolating transformer which doesn't isolate? Noise reduction. greg |
#20
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Isolation transformer source
JW wrote:
Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. You could always salvage a couple of microwave oven transformers and connect them back to back. Make sure and disconnect the secondaries from the cores though, of course. Jon |
#21
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Isolation transformer source
"Jon Danniken" You could always salvage a couple of microwave oven transformers and connect them back to back. Make sure and disconnect the secondaries from the cores though, of course. ** Massively STUPID idea. Absolutely WILL NOT WORK. ...... Phil |
#22
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Isolation transformer source
Jon Danniken wrote:
JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. You could always salvage a couple of microwave oven transformers and connect them back to back. Make sure and disconnect the secondaries from the cores though, of course. Jon I've been tempted to try that just to see how awful the regulation is and what sort of waveform would even come out before the things burned up. |
#23
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Isolation transformer source
On Thu, 10 Jun 2010 09:44:12 -0400, JW wrote:
Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. MCM Electronics has one. Chuck |
#24
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Isolation transformer source
"Chuck" MCM Electronics has one. ** One what ?? ..... Phil |
#25
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Isolation transformer source
Referring to one (1) of 'em
I think Yep, they have 'em. -- Cheers, WB .............. "Phil Allison" wrote in message ... "Chuck" MCM Electronics has one. ** One what ?? .... Phil |
#26
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Isolation transformer source
"Wild_Bill" MCM Electronics has one. ** One what ?? The question is not about the number but the nature of the item. .... Phil |
#27
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Isolation transformer source
Apparently you assume that I didn't understand that.
-- Cheers, WB .............. "Phil Allison" wrote in message ... The question is not about the number but the nature of the item. .... Phil |
#28
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Isolation transformer source
On Fri, 11 Jun 2010 08:24:36 -0500 Chuck wrote in Message
id: : On Thu, 10 Jun 2010 09:44:12 -0400, JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. MCM Electronics has one. Chuck Thanks Chuck. Looking at these for the moment: http://www.mcmelectronics.com/produc...S500-/28-10160 http://www.mcmelectronics.com/produc...-1097-/72-1097 A bit more than I wanted to spend and a little less current capability, but those may be the breaks. |
#29
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Isolation transformer source
In article , JW wrote:
On Fri, 11 Jun 2010 08:24:36 -0500 Chuck wrote in Message id: : On Thu, 10 Jun 2010 09:44:12 -0400, JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. MCM Electronics has one. Chuck Thanks Chuck. Looking at these for the moment: http://www.mcmelectronics.com/produc...N--IS500-/28-1 0160 http://www.mcmelectronics.com/produc...-1097-/72-1097 The Tripp-Lite device has secondary attached to GROUND. This is NOT want you want. All Tripp-Lite supplies are attached to ground forming a new neutral to make a noise reduction device, period. I hope the second device has ground isolation. Greg |
#31
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Isolation transformer source
On Sat, 12 Jun 2010 07:01:32 -0400, JW wrote:
On Fri, 11 Jun 2010 08:24:36 -0500 Chuck wrote in Message id: : On Thu, 10 Jun 2010 09:44:12 -0400, JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. MCM Electronics has one. Chuck Thanks Chuck. Looking at these for the moment: http://www.mcmelectronics.com/produc...S500-/28-10160 http://www.mcmelectronics.com/produc...-1097-/72-1097 A bit more than I wanted to spend and a little less current capability, but those may be the breaks. Check out stock number 72-6670 isolation transformer $65.00. We've had one for years and it works very well. Chuck |
#32
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Isolation transformer source
On Mon, 14 Jun 2010 09:58:33 -0500 Chuck wrote in Message
id: : On Sat, 12 Jun 2010 07:01:32 -0400, JW wrote: On Fri, 11 Jun 2010 08:24:36 -0500 Chuck wrote in Message id: : On Thu, 10 Jun 2010 09:44:12 -0400, JW wrote: Can anyone recommend a good isolation transformer for sale on-line? Need one that will handle 5 amps or so at 120VAC, and have a standard AC plug at the outlet. Prefer one for less than $100 or so, unless that seems unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. Getting lots of irrelevant hits on google... Thanks. MCM Electronics has one. Chuck Thanks Chuck. Looking at these for the moment: http://www.mcmelectronics.com/produc...S500-/28-10160 http://www.mcmelectronics.com/produc...-1097-/72-1097 A bit more than I wanted to spend and a little less current capability, but those may be the breaks. Check out stock number 72-6670 isolation transformer $65.00. We've had one for years and it works very well. Chuck Looks like we have a winner. Thanks again, Chuck. And thanks to all who contributed to the thread. |
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