Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!sharkey!mcf!teemc!mibte!jbh From: jbh@mibte.UUCP (James Harvey) Newsgroups: comp.sys.cbm Subject: Re: COMMODORE 64 power supply Summary: another source (no pun intended) Keywords: Help Message-ID: <2789@mibte.UUCP> Date: 19 Apr 89 16:23:34 GMT References: <185@hhb.UUCP> <1893@csd4.milw.wisc.edu> Organization: Michigan Bell Telephone Company Lines: 43 In article <1893@csd4.milw.wisc.edu>, jgreco@csd4.milw.wisc.edu (Joe Greco) writes: > In comp.sys.cbm article <185@hhb.UUCP>, simon@hhb.UUCP (simon chan) wrote: > > (b) a transfomer which convert the 120v AC into 9v AC. > > So I can cut the cable and put the patch 9v. > > Try Radio Shack. I did. I think I ended up with an 11VAC unit which > works just fine. > > > (c) a way to jump the Commodore64 to use DC only. > > I don't understand why the stupid thing need 9v AC. > > The AC is used for the clocks, and to generate some voltages inside > the machine. Additionally, many user port devices need it. It can > probably be "fudged" if you have a 12VDC supply and a little > creativity. Anybody made a DC -> AC circuit and made a portable 64? > -- > jgreco@csd4.milw.wisc.edu Joe Greco at FidoNet 1:154/200 > USnail: 9905 W Montana Ave PunterNet Node 30 or 31 > West Allis, WI 53227-3329 "These aren't anybody's opinions." > Voice: 414/321-6184 Data: 414/321-9287 (Happy Hacker's BBS) There was a series on converting the C64 to 12 volt operation in Computer Trader Magazine (or CTM, now defunct) in 1987. For an AC supply, find one of the surplus Coleco supplys, part PS 72559 (there are other part numbers but this is the most common). A lot of 64 users here in Detroit are using these, they are stiff enough to run two 64's at once. Plus five volts is available and you use the transformer winding originally intended for the minus 5 volt supply to furnish 9 volts AC. These supplys go for around twelve bucks. -- Jim Harvey | "Ask not for whom the bell Michigan Bell Telephone | tolls and you will only pay 29777 Telegraph | Station-to-Station rates." Southfield, Mich. 48034 | ulysses!gamma!mibte!jbh