That statement is only applicable to the actual electret element itself
which has very low output. There are very few bare electret elements
available in the marketplace.
Practical implementation of the electret element uses a built-in
amplifier inside the package that is normally sold as an "electret
microphone element" - that amplifier does need a voltage to operate, but
the current draw is quite low.
73,
Don W3FPR
On 10/29/2013 6:20 PM, David Woolley (E.L) wrote:
Electret microphones don't need any real bias, as the electret
provides a permanent electrostatic field.
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