wakeke
New Member
You don't seem to know anything about a simple opamp circuit.
An electret mic makes an output of 1V p-p if it has an explosion beside it. A voice makes about 0.02V p-p. That is why a preamp is used to amplify it to about 2V p-p with a gain of 2V/0.02V= 100.
You saved your schematic as a fuzzy JPEG file type instead of as a very clear GIF or PNG file type so I couldn't remove the fuzz.
This is a non-inverting electret mic preamp circuit:
Attached Thumbnails
help-mic-preamp-mic-preamp-again-again.jpg
tried simulating it, worked fine but I didn't notice the shift of the waveform when the 100k pot's value was changed...
R5=50kohm Vout=493.302mV
**broken link removed**
R5=100kohm Vout=(*shifted downward)
**broken link removed**