Tag Archives: power supply

More unhappy capacitors

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My power supply started emitting smoke today. Opened it up and found some bulging capacitors and greasy residue on the top of the chassis directly underneath them. Two 4700uF @ 16v caps. I don’t have any of those values on hand, so I had to use a pile of different ones to do the repair. Fortunately the PCB is resting on a set of metal standoffs so there was adequate room to solder some in underneath.

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I put everything back together and it works fine now. I had to adjust two pots for the variable +- 15vdc outputs. The +5v and -5v were spot on. The AC 6v out measures 7v and the AC 12v out measures 13.5v. Nothing I can do about that, those lines come directly out of the transformer.