From: harry@neuron6.jpl.nasa.gov (Harry Langenbacher) Subject: Re: Uninterruptible Power Supply Article-I.D.: jato.1993Apr15.225326.22831 Organization: JPL Pasadena CA Lines: 25 Nntp-Posting-Host: neuron6.jpl.nasa.gov In article NURDEN1@elaine.ee.und.ac.za (Dale Nurden) writes: >I'm wanting to build a simple UPS for my PC. ... sustain the computer long enough to complete >the current task and save, 5 to 10 minutes should be enough.... >I think, though I don't really need to keep the monitor active (I can try to >remember what to do) so maybe I can avoid a DC-AC inverter and just use a >battery to directly supply the motherboard and peripherals. Now there's a good idea ! All you need is 20 amps DC for a few minutes, and a good (wetware) memory (was I using wp or autocad or ...). I thought of the same idea myself a few days ago. I've got a fairly new car battery that I take along in my 4x4 when I go camping, and it sits around useless when I'm home. I wish I could get a batteryless ups to use it with, or use it with a heavy duty 5-volt regulator to supply the PC. But I guess you'd need -5v and -12v (and +12) too (2 more batteries ?). An alternative would be to leave a 40 AMP battery charger hooked up to the battery and run a 12vdc to 110vac converter running all the time, and when the power goes out, voi-la ! the 110vac converter keeps on running off the battery ! and then I could take the 110vac converter and my computer on the camping trips !-) -- Harry Langenbacher 818-354-9513 harry%neuron6@jpl-mil.jpl.nasa.gov FAX 818-393-4540, Concurrent Processing Devices Group, Jet Propulsion Laboratory, M/S 302-231, 4800 Oak Grove Dr, Pasadena CA 91109 USA