Hi PICList,

I need to generate a sine wave signal for input to an existing electronic
circuit.  The signal will vary in frequency as a function of some other inputs
to a 16F877.  I'm thinking I could generate a 0V to 5V output pulse with the
PIC but need a circuit to convert this signal to a +/- sine wave. The
peak-to-peak voltage has to be a least 2.0V.

I've experimented with a cap in series with the PIC output, and a resistor to
ground.  This generates a nice positive and negative spike with clean zero
crossings but this is not good enough.  The device I am sending the signal to
is also looking at the slew rate of the signal.  I need a relatively genuine
sine wave.

Thanks in advance if you have an ideas.

Freddie.


=====
Best Regards,
"If it can't be done with a PIC, it can't be done :+)"

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