Subject: Re: Apple IIc power supply brick questions Newsgroups: comp.sys.apple2 From: dempson@actrix.gen.nz (David Empson) Date: Sun, 2 May 1999 03:06:28 +1200 Message-ID: <1dr5hc6.1m0nok5wy8ncwN@dempson.actrix.gen.nz> References: <7gcv7b$3djm$1@newssvr04-int.news.prodigy.com> <7gd1e8$uca$1@jetsam.uits.indiana.edu> Organization: Empsoft X-Newsreader: MacSOUP 2.3 NNTP-Posting-Host: 202.49.157.176 X-Trace: 2 May 1999 03:04:43 NZST, 202.49.157.176 Lines: 23 Path: lobby!newstf02.news.aol.com!portc03.blue.aol.com!newsfeed.cwix.com!207.136.66.98!cyclone.news.idirect.com!island.idirect.com!usenet.net.nz!news.iprolink.co.nz!news.actrix.gen.nz!dempson Keith Parker wrote: > It's been a while since I've looked at one, but this is what I > remember: > > 1. There's a transformer, 4 diodes, and a few capacitors. As far as > I know, this would fall under "not a switching power supply". Not unless there was (at a minimum) a small IC associated with the capacitors, and a coil somewhere. It sounds like the first three parts of a simple linear power supply: transformer, rectifier and filter. (The fourth stage is the regulator.) The IIc expects an unregulated DC power source in the range 9V to 20V, so a linear supply as described would be quite sufficient. The internal power converter is probably switch-mode. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand