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From: jeff@abnji.UUCP (jeff)
Newsgroups: net.micro
Subject: Uninterruptable Power Supplies
Message-ID: <412@abnji.UUCP>
Date: Tue, 12-Mar-85 13:21:16 EST
Article-I.D.: abnji.412
Posted: Tue Mar 12 13:21:16 1985
Date-Received: Wed, 13-Mar-85 01:15:10 EST
Lines: 29

[why do transformers hum? Because they don't know the words]

	The March edition of Radio Electronics has an article describing
how to build your own UPS.  It's a DC to AC converter (12VDC in,
120VAC out).   They  show the waveform, and it obviously is more of a
square wave than a sine wave.  They did not reccommend it for use with
everything, and since computers were not explicitly mentioned I'd
say it is NOT suitable for use with micros.

	Jameco's Winter Flyer is out and they have the following
from Data Shield

model AT800	800 watts of power & sine wave output			$800
model AT500	500 watts of power for most multi-user PCs		$700
model XT300	300   "     "  "					$400
model PC200	200   "     "  "					$300



also of possible interest
model S75	surge protector with a 200 joule rating			$50
		(most others I've seen are only 70 joules)


			hope this is informative

			Jeff Skot

			{ ihnp4 | mcnc | cboscb} abnji ! jeff