Author: grubertm@gmail.comDate: 20:14 30-04-07
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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 ?
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Author: Lord GarthDate: 20:39 30-04-07
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<grubertm@gmail.com> wrote in message
news:1177978474.155082.237790@e65g2000hsc.googlegroups.com...
> 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.
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Author: EeyoreDate: 23:21 30-04-07
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Lord Garth wrote:
> <grubertm@gmail.com> wrote
>
> > 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.
It's doesn't run on 2.5V though does it ?
A TLC271 might be ok.
Graham
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