Hi All My old DC PS finally Quit regulating, problem is it was built so many years ago that I no longer have the schem. It controls the Voltage output from 35 V down to about 1.5V The current can be adjusted from 2A down to about 5ma. I've found some bad caps and replaced them but it still does not regulate down below 10 V and it used to. The main problem (I think) is the reg. IC# is IC321 and I can't find it or cross it. It is a 5/16" can type with 8 legs on it. The IC controls a large heat sinked T O 3 trans. Does anyone have info on this IC?? I would welcome your schematics for similar home made PS's Secondly where in Canada can I buy a ESR cap tester. No insult but I had a bad experience years ago with an electronics company in the States. I sent down a mail order for about $350.00 It was cashed but never received any thing for it and no replies afterwards..! TIA Warren Campbell Campbell's TV & Appliances Cannington On Canada ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: http://www.freelists.org/archives/techassist/