[sdiy] trying to understand amplification of an electret mic element

[Ingo Debus]

Am 06.09.2011 um 17:15 schrieb dan snazelle:

> normally when I want to add a lot of gain to something quickly, I grab a TL072 and use a resistor combination of say 1k to 1M.
> 
> However, with these microphone elements, things are all weird.
> 
> I started off as I understand you are supposed to by connecting the element to a 9v source through a 1k resistor. i tied the other end to ground. I took the signal out through a .1uf cap.

So you connected the mic through a 0.1 uF cap to a preamp with an input impedance of 1k? The cap is way too low then, try 10 uF.

Ingo