> > is it possible to demodulate a 38khz signal to get data using discretes
> and> logics?

> 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

It isn't. I've tried and failed. But....I'd still like to do it one day
for power consumption reasons. The 3-terminal types use
around 3-5mA and the VCR can types 1-3mA, and both have
just a few kHz bandwidth. It should be possible to make some
thing with discretes and/or CMOS op-amps that uses the minimum
of current. One particular application is waking a sleeping PIC
with IR. I've managed it with PIR using a micro-current piezo sensor
not with IR

Data sheet showing gizzards of the IS1U60

http://faculty.plattsburgh.edu/stephen.linder/Academic/techLinks/dataSheets/
is1u60.pdf

Very different from the internals of an SL486 IC, which requires
a s...load of external components and doesn't really perform
any better

PIC remote control using the IS1U60

http://www.picbasic.co.uk/Article.pdf

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