Hi !
To everyone interested in/ discussing electret preamp/ (etc) circuits.
Just a quick question / thought.... how about adding a simple AGC circuit to
the electret preamp ? Complicates things a little, but takes care of a lot of the
problems that are being voiced.... can be something as simple as bleeding off
a little signal from the preamp (or later), rectifying the signal, averaging it with
a simple RC filter, and using this 'running average' to drive the gate of an FET.
The FET's function is to bleed to Gnd some of the signal from an 'early' part of
the circuit / amp, thereby decreasing overall gain, and maintaining a reasonable
output level for very faint sounds, and for loud , 'overdriving' sounds (assuming
adequate gain is present to pick up the faint sounds). Anyway, my two cents worth...
thoughts ?