When trying to keep costs down, I keep in mind the "Three Diddle Rule". What would be the cost if someone has to go into the unit three times after it is installed to make adjustments? Pookie ----- Original Message ----- From: "Russell McMahon" To: Sent: Monday, July 01, 2002 1:59 AM Subject: Re: [PIC]: A bit more on"How to implement a Infrared communications" > > is it possible to demodulate a 38khz signal to get data using discretes > and > > logics? > > > Yes. > But it is very unlikely to be worthwhile unless you mainly value the > learning experience or have an extremely demanding requirement (and even > then it may not be). > > For about $US2 retail you can buy a 3 chip device that has an optical filter > (piece of coloured plastic), amplifier, bandpass filter and > detector/demodulator plus associated gain control circuitry. To reproduce > this yourself with equal results would take a handful of transistors or > several op-amps and associated components in each case. The size would be > much larger and achieving performance similar to the $2 part would not be > trivial. > > > Russell McMahon > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads