Simple electret "pre-amp"

[[email protected]]

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 ?

 

[Lord Garth]

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 ?

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.

 

[Eeyore]

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