Rebuilding my Old LARGE Homebrew P/S Adventure!

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Rebuilding my Old LARGE Homebrew P/S Adventure!	Reply
by N9MXY on October 12, 2009	Mail this to a friend!
Well I dug it out of the closet last week after over 10yrs of rest and it fired up like a champ but last night I lost a SK7075 diode so it looks like time for a rebuild. I built this as a culmination of College electronics projects back in the late 80's. A Voltage Variable 100Amp powersupply. Back in the day I could set it at 15Volts and draw 100 amps and only drop a tenth of a volt. Looking at it I can see many places the layout could be cleaned up and made look more professional. The parts can be had off ebay of all places so tonite the journey begins. A New Rectifier is on order and a bunch of LM723's I'll probably get new pass elements too 8X 2N3771. If I can find a deal on the filter caps they will be replaced. Hopefully I won't have to dig into the regulator breadboard, my eyes aren't that good up close anymore. lol Anybody out there "revisit" a major homebrew project a couple decades after it's genesis? I'm looking forward to it....

RE: Rebuilding my Old LARGE Homebrew P/S Adventure!	Reply
by W7ETA on October 13, 2009	Mail this to a friend!
Ever once in a while, I find good deals on 450V Nippon electric? on eBay. the last batch I got in were, I think, 330uF. Current production "lytics are really small, even compared to caps from 10 years ago. 73 Bob

RE: Rebuilding my Old LARGE Homebrew P/S Adventure!	Reply
by KE3WD on October 16, 2009	Mail this to a friend!
If the pass transistors are still good I doubt that replacing them would be of any benefit to anyone other than the guy sellin' parts.

RE: Rebuilding my Old LARGE Homebrew P/S Adventure!	Reply
by KU3X on October 18, 2009	Mail this to a friend!
You don't need 450V filter caps. The voltage is too high which will limit the capacitance. If you lived in PA I'd give you a frew 64,000 mf caps to be used next to the bridge rectifier. You need 3000 mf per amp of current, rule of thumb. Barry, KU3X

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