Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site wateng.UUCP 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)