Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ukma!tindle
From: tindle@ms.uky.edu (Ken Tindle)
Newsgroups: sci.electronics
Subject: Re: wanted - infrared remote control repeater
Keywords: remote, ir
Message-ID: <13043@s.ms.uky.edu>
Date: 25 Oct 89 12:33:35 GMT
References: <254@sea375.UUCP>
Reply-To: tindle@ms.uky.edu (Ken Tindle)
Distribution: usa
Organization: U of Kentucky, Mathematical Sciences
Lines: 16

Radio-Electronics May 1989 has a circuit that does what you want- but my
experience is that the pickup stage is not very good.  One needs to change
the phototransistor to a photodiode design with an IR filter in front.  A
reasonably good IR filter can be made from an exposed piece of color negative
film.  

An alternative is a darlington phototransistor.  Oh, and Rat Shack has in 
some stores now something that looks like the front end IR receiver from a
VCR; one could possibly use it (it's cheap!) but I haven't got one yet, so
I'm not sure how good they'd be for this.

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INTERNET:tindle@ms.uky.edu | "I heard you." -Kirk 
BITNET:tindle@ukma.bitnet  | "He simply could not believe his ears."     
Ken Tindle - Lexington, KY | -Spock, The Trouble With Tribbles
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