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Path: utzoo!watmath!wateng!ksbszabo
From: ksbszabo@wateng.UUCP (Kevin S. B. Szabo)
Newsgroups: net.analog,net.video,net.audio
Subject: Re: Do-it-yourself IR control?
Message-ID: <1071@wateng.UUCP>
Date: Wed, 6-Jun-84 01:41:59 EDT
Article-I.D.: wateng.1071
Posted: Wed Jun  6 01:41:59 1984
Date-Received: Wed, 6-Jun-84 07:01:55 EDT
References: <376@ihu1g.UUCP>
Organization: U of Waterloo, Ontario
Lines: 24

I'm just back from holidays (actually marriage) so I hope this info isn't
redundant. 

Motorola has a chip set MC14457 and MC14458 which are a transmitter and
receiver pair in CMOS technology. There features are :

	Ultrasonic/Infared remote control
	Selection of 16 channels with a single keypress, 256 with two presses
	One analogue output, 6 bit resolution.

This is obviously a TV controller, with certain keys increasing the analogue
output and others decreasing or setting it to zero (i.e. Mute). Anyway,
you can do what you want with the digital channels, i.e. probably run them
into a few counters and then into some DAC's to control the audio.

Caveat: I haven't used these chips so I can't personally vouch for them.
Apparently the hardest part in building the control is the preamp for the
IR photodiode. It has to be very sensitive, ignore room lights and direct
sunlight and also any nearby electronic interference from the digital 
decoding circuitry. Anyway, have a look in the Motorola Cmos DataBook.

			Kevin
-- 
	Kevin Szabo  watmath!wateng!ksbszabo (Elec Eng, U of Waterloo)