On 22 Feb 2005 15:42:00 -0800, wrote:

Paul, I don't want to sound critical here, but this newsgroup is
about "homebrew." In that light, I'd suggest a simple quad
op-amp circuited as two phase-shift oscillators (pick the AF
desired) out of two of the op-amps in the quad package, use
the third as a resistive summing mixer.

Did I miss something or are you suggesting using a Wien bridge circuit
as an audio oscillator ? How should the amplitude be stabilised in
order to get nearly a sine wave output ?

While I guess that quite a few radio amateurs with professional
background in electronics are following this newsgroup, do not forget
that most young radio amateurs (with limited test equipments) are much
more used to playing with computer programming and computer hardware
than working with circuit design.

Both the traditional approach as well as some more day to day approach
is required, in order to make amateur radio a viable hobby even in the
future.

Paul OH3LWR