Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site sdcrdcf.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!vax135!cornell!uw-beaver!tektronix!hplabs!sdcrdcf!darrelj From: darrelj@sdcrdcf.UUCP (Darrel VanBuer) Newsgroups: net.analog Subject: Re: AUTO-TURNON POWER STRIP Message-ID: <1917@sdcrdcf.UUCP> Date: Sat, 20-Apr-85 11:04:43 EST Article-I.D.: sdcrdcf.1917 Posted: Sat Apr 20 11:04:43 1985 Date-Received: Tue, 23-Apr-85 06:20:43 EST References: <175@ski.UUCP> <555@intelca.UUCP> Reply-To: darrelj@sdcrdcf.UUCP (Darrel VanBuer) Distribution: net Organization: System Development Corp. R+D, Santa Monica Lines: 35 Summary: I have a homebrew auto outlet (based on a electronics article of 10 years ago) which uses all of three components. Here is a crude diagram. White -------------------------------------------------------- (AC plug) | Master | Controlled = = | | Black --+-->|-->|--+------+--^v^v^v----\ | +--|<--|<--+ G \|>| | +--------------------------------|<|-----------------+ MT1 MT2 Bridge rectifier 10 ohm Triac or 4 diodes resistor Voltage rating of bridge is not important, current rating should exceed the master load (e.g. mine has 3 amp diodes, 300 watts worth). Even a small load will trigger the switch--minimum is the trigger current of the triac. The triac needs voltage and current ratings to match the load (e.g. mine has 200 V 6A rating for 110V 600 watts). The resistor is 1/2 watt. The effect is about a 1.5 volt drop on both outlets, switching noise is negligible since the triac gets turned on within a few volts of each zero crossing. (Just to clarify the diagram, the bridge is in series with one outlet, the triac in series with the other. The resistor connects the gate to the hot side of the master outlet). -- Darrel J. Van Buer, PhD System Development Corp. 2500 Colorado Ave Santa Monica, CA 90406 (213)820-4111 x5449 ...{allegra,burdvax,cbosgd,hplabs,ihnp4,orstcs,sdcsvax,ucla-cs,akgua} !sdcrdcf!darrelj VANBUER@USC-ECL.ARPA