Does it have to come from the PIC? There's several other oscillator options
available that you could *control* with a PIC. I'm thinking some kind of
VCO using the PWM to adjust the voltage, or maybe just "gating" the signal
(analog switch?)

You'd get a cleaner signal with much less complicated software.

At 1.3KHz you could also implement some crude freq meter function to
provide a feedback loop...  Assuming exact freq is important to you.

Just some ideas.
-Denny



> Hi,
>
> I need to generate a 1300Hz ish sine wave pulse, from a pic, that I can
plug
> into a tape recorder's line in jack to log.
>
> Obviously, it's fairly easy to get a 1300 Hz square wave, but what can I
do
> to simply and easily smooth this out a bit, so it's reasonably close to a
> sine wave?
>
> Any pointers appreciated
>
> Thanks
>
> Jon
>
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