How to determine a Powersupply pinout
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Posted by Uriah on October 21, 2006, 1:30 am
Please log in for more thread options I have an old piece of test equipment that uses a 5 pin DIN plug as the input from the powersupply. I don't have this particular PS. How would I go about figuring out the powersupply requirements and pinouts that need to go into this 5 pin DIN. They company is long gone and I can't find anyone else who has one. It is a International Test Systems 2000S. Circuit Test. Thanks Russ | |||||||||||||||||||
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Posted by Homer J Simpson on October 21, 2006, 1:48 am
Please log in for more thread options I would try to figure out that part of the circuit and determine the voltages from that. First, figure out the ground or common pins. | |||||||||||||||||||
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Posted by Chris on October 21, 2006, 12:57 pm
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Uriah wrote: > I have an old piece of test equipment that uses a 5 pin DIN plug as the
> input from the powersupply. I don't have this particular PS. How > would I go about figuring out the powersupply requirements and pinouts > that need to go into this 5 pin DIN. They company is long gone and I > can't find anyone else who has one. It is a International Test Systems > 2000S. Circuit Test. > > Thanks > Russ There's no standard pinout. These 5-pin DIN power connectors more often than not had +5V, +/-12V and GND, but no guarantees. You could do a lot worse than starting with Mr. Simpson's advice. Just open the case and look on the circuit board itself, and poke around with an ohmmeter on the 20K range. Even if the power supply voltages aren't silkscreened onto the board, you can make some easy assumptions. For instance, if you see a 16-pin 74XX IC, you've got GND and one of the power supply voltages right there. The pinout of an op amp will probably tell you the analog V+ and V-. Be sure to trace back to the connector before plugging anything in -- there may be voltage regulators on board that are regulating the power supplies. If you've got a little time and patience, you might want to use eBay to find prior sellers of this piece of equipment. They may have more information to help you, or even may have scanned a manual which may have the information there. You also might want to try posting at sci.electronics.equipment. Good luck Chris | |||||||||||||||||||
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Posted by Michael Black on October 21, 2006, 1:27 pm
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"Chris" (cfoley1064@yahoo.com) writes: > Uriah wrote:
>> I have an old piece of test equipment that uses a 5 pin DIN plug as the
>> input from the powersupply. I don't have this particular PS. How >> would I go about figuring out the powersupply requirements and pinouts >> that need to go into this 5 pin DIN. They company is long gone and I >> can't find anyone else who has one. It is a International Test Systems >> 2000S. Circuit Test. >> >> Thanks >> Russ >
I started to write a reply, and then realized complications that I didn't
> There's no standard pinout. These 5-pin DIN power connectors more > often than not had +5V, +/-12V and GND, but no guarantees. > > You could do a lot worse than starting with Mr. Simpson's advice. Just > open the case and look on the circuit board itself, and poke around > with an ohmmeter on the 20K range. Even if the power supply voltages > aren't silkscreened onto the board, you can make some easy assumptions. > For instance, if you see a 16-pin 74XX IC, you've got GND and one of > the power supply voltages right there. The pinout of an op amp will > probably tell you the analog V+ and V-. Be sure to trace back to the > connector before plugging anything in -- there may be voltage > regulators on board that are regulating the power supplies. > feel like spelling out at the time. ONe thought that occurred to me is that the AC adaptor could be AC output. In which case, one is likely looking for a bridge rectifier connected to the connector. In that case, there'd be no continuity between the connector and the supply voltages of the IC. Likewise if regulation was on the board, there's be no continuity between the connector and IC power pins, since the voltage would go through a regulator. The board should reveal enough information (unless someone's potted it or rubbed off all the IC numbers). But of course, being able to read that information depends on who is doing it. What's obvious for someone who's been around electronics for decades is not so obvious for someone who may be looking for the first time. Michael > If you've got a little time and patience, you might want to use eBay to
> find prior sellers of this piece of equipment. They may have more > information to help you, or even may have scanned a manual which may > have the information there. > > You also might want to try posting at sci.electronics.equipment. > > Good luck > Chris > | |||||||||||||||||||
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Posted by Uriah on October 21, 2006, 4:58 pm
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Thank you, everyone. I am going to take my time on this one. I have waited a few years to get one of these.. They are really rare. I notice on ebay you can't really search that far back on completed auctions. Is there any way around this? I used to be able to go back a year or two and see what items sold for but now it only goes back about a month. Here is the link to the unit I just bought. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=010&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=200037943572&rd=1&rd=1 I have never seen a manual for it and few people own one. I appreciate the help. Thanks Russ Michael Black wrote: > "Chris" (cfoley1064@yahoo.com) writes:
> > Uriah wrote:
> >> I have an old piece of test equipment that uses a 5 pin DIN plug as the
> >> input from the powersupply. I don't have this particular PS. How > >> would I go about figuring out the powersupply requirements and pinouts > >> that need to go into this 5 pin DIN. They company is long gone and I > >> can't find anyone else who has one. It is a International Test Systems > >> 2000S. Circuit Test. > >> > >> Thanks > >> Russ > >
> > There's no standard pinout. These 5-pin DIN power connectors more > > often than not had +5V, +/-12V and GND, but no guarantees. > > > > You could do a lot worse than starting with Mr. Simpson's advice. Just > > open the case and look on the circuit board itself, and poke around > > with an ohmmeter on the 20K range. Even if the power supply voltages > > aren't silkscreened onto the board, you can make some easy assumptions. > > For instance, if you see a 16-pin 74XX IC, you've got GND and one of > > the power supply voltages right there. The pinout of an op amp will > > probably tell you the analog V+ and V-. Be sure to trace back to the > > connector before plugging anything in -- there may be voltage > > regulators on board that are regulating the power supplies. > > > I started to write a reply, and then realized complications that I didn't
> feel like spelling out at the time. > > ONe thought that occurred to me is that the AC adaptor could be AC output. > In which case, one is likely looking for a bridge rectifier connected > to the connector. > > In that case, there'd be no continuity between the connector and the > supply voltages of the IC. Likewise if regulation was on the board, > there's be no continuity between the connector and IC power pins, > since the voltage would go through a regulator. > > The board should reveal enough information (unless someone's potted > it or rubbed off all the IC numbers). But of course, being able > to read that information depends on who is doing it. What's obvious > for someone who's been around electronics for decades is not so > obvious for someone who may be looking for the first time. > > Michael > > > If you've got a little time and patience, you might want to use eBay to
> > find prior sellers of this piece of equipment. They may have more > > information to help you, or even may have scanned a manual which may > > have the information there. > > > > You also might want to try posting at sci.electronics.equipment. > > > > Good luck > > Chris > > | |||||||||||||||||||
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> input from the powersupply. I don't have this particular PS. How
> would I go about figuring out the powersupply requirements and pinouts
> that need to go into this 5 pin DIN. They company is long gone and I
> can't find anyone else who has one. It is a International Test Systems
> 2000S. Circuit Test.