Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!nrl-cmf!ames!pasteur!ucbvax!decwrl!sun!pitstop!sundc!rlgvax!smadi
From: smadi@rlgvax.UUCP (Smadi Paradise)
Newsgroups: sci.electronics
Subject: Re: Ever seen a switch like this?
Message-ID: <1093@rlgvax.UUCP>
Date: 31 Jan 89 01:40:00 GMT
References: <7485@ihlpf.ATT.COM>
Reply-To: smadi@rlgvax.UUCP (Smadi Paradise)
Organization: Computer Consoles Inc, Reston VA 22091
Lines: 34

warren@ihlpf.ATT.COM (Montgomery) writes:
>I am looking for a stunt box that will switch my stereo receiver on
>according to whether or not my turntable is running.

Here's a ``quick and dirty'' one:

neutral---------------------------------------------
				|		   |
			control (phono)		load (amp)
				|		   |
				|		  ___
				|		  /\/ T1
				|		  ---
				|		  /|
				|	   R1	 / |
				|________/\/\/\_/  |
				|	|	   |
				v	_	   |
				-	^	   |
			D1-D4	v	_	   |
				-	^	   |
				|	|	   |
live------------------------------------------------

R1 	100 ohm (?)
D1-D4	1N4001
T1	Triac, sensitive gate, > 2 * load current, 200V.

Load voltage is somewhat dirty sine wave; an .1uF/200V capacitor
across the triac is recommended.  Phono current should be < .7A AC.

Enjoy!

On (just a guest here) Paradise