They are effectively a carbon resistor that varies depending on the =
pressure in the diaphragm. To see a voltage change you'd need to place it =
in a voltage divider - a series resistor equivalent to the mikes resistance=
.

Need to go home - typed .com at the end of a sentence just now.

>>> ceddy@NB.NET 02/20/02 04:49PM >>>
I have a handset, identical to a regular telephone handset. It has one
of those carbon electret microphones in it. I cannot get any sort of
signal on my scope when I holler in the mic. I am used to the active
mics, like the two pin device that takes a 1K pullup to power it. Does
anyone know what sort of amplifier is necessary? Impedance of the mic
element? Gain that is necessary?

Thanks all
Chris~

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