JRock Posted October 20, 2010 Report Share Posted October 20, 2010 Not real sure where to post this... My PSU ended up being -12/+11.74. I took the other 2 leads out of this transformer (It has 7) and built a -15/+14.74. I used the method described in the Bi-polar PSU Wiki with the Voltage Doubler. First, Is this something to worry about? I'm guessing for a Bi-polar supply you want both sides equal. If it is, What can I do? Should I slip a resistor into the high side and bring them both down to XX.74? Quote Link to comment Share on other sites More sharing options...
Duggle Posted October 20, 2010 Report Share Posted October 20, 2010 First of all, which circuit on the linked article did you build? Quote Link to comment Share on other sites More sharing options...
Flemming Posted October 20, 2010 Report Share Posted October 20, 2010 (edited) I just built a voltage doubler too, from the handdrawn schem here Mine was also a little bit off, but it seems that when it's under load it behaves just as expected - i use mine for MBFM Tried to clear the schem up a bit (built to run MBFM from C64 PSU) Edited October 20, 2010 by Flemming Quote Link to comment Share on other sites More sharing options...
Shuriken Posted October 20, 2010 Report Share Posted October 20, 2010 If you had a look at the datasheet of either the 7812/7815, you would have seen that it's well within the specified limits. Quote Link to comment Share on other sites More sharing options...
nILS Posted October 20, 2010 Report Share Posted October 20, 2010 JRock doesn't do datasheets. :flowers: Quote Link to comment Share on other sites More sharing options...
JRock Posted October 20, 2010 Author Report Share Posted October 20, 2010 (edited) Not if I can avoid it :ninja: They're like goddamn stereo instructions! Strike that. I like reading stereo instructions :laugh: {(That's me laughing @ my own joke) It didn't even occur to me. I didn't think it might be the regulators... I was figgering Human Error if anything. So I can continue to feel proud of myself for building this PSU :cheer: Honestly I don't even know where I got the transformer from. I think i found a stereo for free on the roadside. Should've read the manual. It has Seven leads. I managed to get +/-12V and +/-15V out of it. I thought I was gonna be able to get 5V too but after I hooked the other Johnsons up I was only getting 2.5V from the remaining leads. I don't know what the amperage is cause the fuse in my Multimeter kept blowing out when I tried to test it. I went through 4 of them. Let's see what it does under load. I rent so fire's not a huge concern That's nice Flemming! I couldn't understand why my 1N9148s kept blowing up, then I googled bi-polar PSU and saw they were supposed to be 1N4004s (or 7s) I robbed some 4002s off that stereo PCB and they seem to be working alright. Edited October 20, 2010 by JRock Quote Link to comment Share on other sites More sharing options...
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