Ok, yall, I got it to work. It works just as everyone advertised. It
does not help that the one of the two that I was working on was stone
cold dead.. And I did not think to swap them. Duh. As soon as I tried
the second one I had lots of complex voiceband waveforms.

Thanks all..
Chris~

"Peter L. Peres" wrote:
>
> The carbon mike needs a good current through it to make it work. Try to
> feed it through a resistor calculated for 20mA through the mike (from 12V
> or such). The impedance is what you measure across the mike when biased,
> in parallel with the bias R, plus a small capacitive parallel component
> (<5nF afair). The output signal will be large (1 Vpp is easy at 1" from
> speaker's mouth with the indicated bias circuit).

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