> 16f84 to drive an IR led but i'll need to modulate it at 38kbps

A 555 example

http://home.clear.net.nz/pages/joecolquitt/txless.html

or set up a 38kHz PWM output and turn it on/off.

I recommend Zetex transistors for the LED switching. They're
heaps better than common junk-box transistors (eg 2N2222,
BC548, BC337 etc)

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