Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!hplabs!hpfcso!hpfcdc!kingdom
From: kingdom@hpfcdc.HP.COM (Mike Kingdom)
Newsgroups: sci.electronics
Subject: Re: NEGATIVE VOLTAGE?
Message-ID: <4660008@hpfcdc.HP.COM>
Date: 11 Mar 91 17:59:42 GMT
References: <1991Mar8.140031.20095@uncecs.edu>
Organization: HP Fort Collins, Co.
Lines: 13

> I'm in the midst of a construction project that, when complete, will
> require a -12 volt power supply, a +5 volt, and a +12 volt supply.
> I can handle the +5, and the +12, but the -12 is vexing me.  Can
> I use another independent 12 volt supply, and reverse the leads, or
> would this be a fire hazzard?  Whats the scoop on negative voltage
> power supplies anyway?

You'll probably be best off to buy one from any of the millions (well
that's an exaggeration :-) of surplus dealers around. These are very
common types of supplies. It's tough to build one for less than you
can buy one. 

-- Mike