At 11:45 04/02/99 +1100, you wrote:
>Yes I have tried it. It just works with a dynamic microphone but I get
>nothing from an electret microphone.

That is puzzling- are you sure the electret mic is connected and working
properly?

Typicaly dynamic mic sensitivity is -75dB to -60dB, typical electret
capsules are about -60dB, so should, if anything, have a higher output
signal.  They _do_ usually need a supply to the capsule- usually 1.5-10V
DC, with the correct polarity, to drive the internal FET amplifier- maybe
the chip you used to use supplied this?  Or the mic polarity has been
accidentally reversed?

Anyway, if it works with a dynamic, there's no reason at all why it
shouldn't with an electret.

Nigel
--
Nigel Orr                  Research Associate   O   ______
        Underwater Acoustics Group,              o / o    \_/(
Dept of Electrical and Electronic Engineering     (_   <   _ (
     University of Newcastle Upon Tyne             \______/ \(