Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!mailrus!csd4.milw.wisc.edu!leah!albanycs!crdgw1!uunet! From: prindle@NADC.ARPA (Frank Prindle) Newsgroups: comp.sys.cbm Subject: Making a C64 power supply Message-ID: Date: 15 Jun 89 18:12:37 GMT Sender: prindle@NADC.ARPA (Frank Prindle) Lines: 19 Last night I absolutely confirmed that the Radio Shack 18 Volt center-tapped 2 Amp transformer (currently on sale for $6.88 in Philadelphia area) works fine to supply the required 9 Volts A.C. The power supply for one of my 64s now consists of this transformer (use one side of the secondary and the center tap for 9 volts - tape up the other secondary lead), and a tiny Power General 5 volt, 4 amp potted switching supply that works right off of the 115VAC line (picked up 4 of them at Trenton for $4.00 each!). So for those of you looking for the right 9V transformer, it's as near as your local Radio Shack. With the typical load of a C64 (1 amp for older 64s, somewhat less for newer), the A.C. voltage at the center tap is about 9.5 volts, and the transformer, though it gets a bit warm, is running at half or less of it's rated current. Extra 5V reserve in the supply to handle accessories and/or a 17xx doesn't hurt either. Just make sure you don't use the full (18V) secondary winding, unless you like the odor of smoking electronic components! Sincerely, Frank Prindle Prindle@NADC.arpa