I am using a Logitech/Labtech USB microphone which is doing an okay job but could benefit from some more gain. I don't want to touch their ADC and USB circuit but would prefer adding something in-line. Given that their 2-wire electret micro is powered by 2.5v on the signal line what would be a simple way to say double the signal seen by the circuit downstream ?
Simple electret "pre-amp"
May 01, 2007
2 Replies
Use an opamp configured to provide a gain of 2.
The o-l-d LM1458 dual opamp would work fine and it runs on a single ended supply.
It's doesn't run on 2.5V though does it ?
A TLC271 might be ok.
Graham
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