Many thanks to all for the very useful advice. Now I am actually looking
forward to getting started.

I noticed the PIC DTMF generator circuit (via link) suggested by Scott uses
a 16F84. However, other respondents mentioned the 18xxx series. Am I
correct in assuming that the differing amplitudes of each SW necessitate
the hardware multiplier of the latter micro? I am a bit concerned as have
heard these are more complicated to program. Is there a way to do this with
the 16F84? I recall something called "twisting".

An off-list reply suggested a special PIC designed for motor control which
has 3 PWM outputs. The differing amplitudes could then be trimmed
externally. Is this a much simpler approach for a beginner?

For someone with general electronics experience, which "how-to" book would
be most applicable to these type of signal related projects? IOW maybe one
that contains proportionately fewer control apps than others.

Sorry if that's alot of questions, but I am desparate to succeed within the
next few months to get my grade.

Peter

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