pic microcontroller discussion list <> wrote:
> this to be polarized or non polarized?

Non polarised, ideally.  Have a search on the web for recommended capacitor
types for audio applications, electrolytics in the signal path are usually
best avoided!

> would guess that for the most part I will be using dynamic mics,
> professional ones, but low output level.

If you don't want to go through the cycle of build it, test it, change the
gain that I suggest in my other mail, you can try working out the gain for
yourself.

You can probably guess the SPL at the recording position to within 10dB,
even if you don't have an SPL meter.  The mics will specify sensitivity so
you can work out the corresponding electrical output from the mic.  Then
you can figure out how much gain you need to get that up to the input level
for your recording device.

e.g. if the SPL is 100dB, and the mic sensitivity is 1mV @ 100dB, the
output voltage will be 1mV.  If you need 100mV (-10dBV) output, you need
x100, 40dB gain.  More likely the specs will be in mV/Pa and dBm, so you
will need to fight your way through the numbers.

It would probably be more interesting to just build one and try it :-)

Nigel
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