Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site duke.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!mcnc!duke!crm From: crm@duke.UUCP (Charlie Martin) Newsgroups: net.micro Subject: Re: Voltage protection for micros Message-ID: <5391@duke.UUCP> Date: Sun, 10-Feb-85 13:38:03 EST Article-I.D.: duke.5391 Posted: Sun Feb 10 13:38:03 1985 Date-Received: Wed, 13-Feb-85 01:35:25 EST References: <8159@brl-tgr.ARPA> Reply-To: crm@duke.UUCP (Charlie Martin) Organization: Duke University Lines: 21 Summary: There is a way to do an uninterupptible power supply that will work for short periods that I have always wanted to try, but never had the need/ambition... what you would do is find the cheapest 110/60 alternator you could, and a cheap electric motor, and build a GREAT BIG HEAVY mucking flywheel; drive the flywheel with the motor, then drive the alternator with the flywheel. When the power was working OK, then you have a mechanical loss between the line and the load -- so it costs a little more to run the thing. When the power changed over time (voltage or freq) then the flywheel's inertia would smooth the change. In addition, stored energy of rotation would provide a short-term source of power which would keep you up at least long enough to save and shut down. I've never tried it, as I said -- if you do and it works, let me know. -- Opinions stated here are my own and are unrelated. Charlie Martin (...mcnc!duke!crm)