Microphone/sound card question

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John Dunkley - 29 Jun 2003 12:16 GMT

I want to use the 'stereo' line-in of my sound card as two microphone
inputs, one microphone in each channel (left and right.)

If I construct a simple amplifier to boost the microphone level to 'line
in' level, is any compensation required or is a straight amplification OK?

I want two separate microphones to produce two independent tracks in my
software program and using one sound card will allow this if I use the
'line in' line rather than purchase two sound cards to get two
microphone inputs into my software.

JD

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Rod Speed - 29 Jun 2003 21:48 GMT

> I want to use the 'stereo' line-in of my sound card as two microphone
> inputs, one microphone in each channel (left and right.)

> If I construct a simple amplifier to boost the microphone level to 'line
> in' level, is any compensation required or is a straight amplification OK?

Hasnt the sound card got a stereo mic in socket ? Most do.

Whether it requires compensation with the
line in socket varys with the mics used.

> I want two separate microphones to produce two independent
> tracks in my software program and using one sound card will
> allow this if I use the 'line in' line rather than purchase two
> sound cards to get two microphone inputs into my software.

You could use what is basically just a passive Y adapter to
the mic input of the sound card if it has one. Basically just
connecting two mono mics to each side of the stereo mic in.

Might get a bit tricky with what are often called
powered mics tho, and quite a few of the cheap
mics are. You'd just have to allow for that too.

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Electronics Forum / Electronics / June 2003

Microphone/sound card question