[Elecraft] Using a PC headset with K3, connections reverse at rear MIC jack?

[Don Wilhelm]

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.
>