If it's a dynamic (moving coil) microphone you shouldn't have to use a capacitor at all.
John Fields
Professional Circuit Designer
Microphone For Computer
Apr 19, 2005
7 Replies
Heh, maybe so. Got a schematic?
Please bottom post.
I want to experiment using a dynamic mic with my computer. I believe i would have to connect a capacitor in series with the hot or negative side of the mic? Also what type & value of cap?
If it is an electret type, you will need a phantom power circuit.
Basically, the mic - is ground The mic + connects to a resistor. The other end of the resistor connects to the battery. The exact value depends on the voltage you supply and the current you want to provide but something like a 3k would be a start and 1.5 volts.
To extract the audio, connect a 1uF or so capacitor to the mic+ / resistor junction and send this to the sound card.
look here:
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connects
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Gotcha! first that would be very odd for any Sound Blaster compatible to provide power. They don't so if that is what you have, just plug in the dynamic mic. If you need to block DC because your sound card really does supply power, add a series cap...
1uF would be fine be aware that the low end may suffer a bit since Xc=1/(2*pi*F*C). You might simply reduce the high frequencies a bit to adjust the response.
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