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From: psfales@ihlpl.ATT.COM (Peter Fales)
Newsgroups: sci.electronics
Subject: Infra-Red Receiver?
Message-ID: <1922@ihlpl.ATT.COM>
Date: Wed, 18-Mar-87 00:41:21 EST
Article-I.D.: ihlpl.1922
Posted: Wed Mar 18 00:41:21 1987
Date-Received: Thu, 19-Mar-87 06:38:36 EST
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 25
Keywords: How do I make one?

I have been trying to come up with a simple method to receive IR signals
such as those produced by a television set remote control.  Since I don't
need a great range (even a few inches would suffice), I thought it would
be fairly simple, but I have come to the conclusion that there is
something I don't know.

In the March issue of Byte, Steve Ciarcia claims to the the job with
nothing more than a photodiode in series with a resistor (cleaned up
through a voltage comparator).  But I can't make this work.  I have
tried several different IR photodiodes and phototransistors and in all
cases the response time is too slow to accurately reproduce the square
wave signal of the carrier (~40 KHz).   One diode I have not tried yet
is the TIL413 used in Ciarcia's article.  Can I expect it to make that
much difference?  Anybody know where I can get one?

Any other suggestions?  As a result of the recent articles in Byte on
this topic, I suspect that there may be others on the net who would
be interested in any suggestions you may have.

Thanks in advance,
-- 
Peter Fales		UUCP:	...ihnp4!ihlpl!psfales
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