Dumitru Stama wrote:
> Hi Olin, thank you for your answer
> Do you happen to have a suggestion for the type of mic i should use in
> this project ? I really don't know what should i look for. Can i use a
> mic from a pair of headphones with microphone for computer use ? I
> have a broken pair and i can take the mic from them.
> I could only find an electret microphone at the electronics store we
> have here :
> ECM30B - Microphone condenser - 61db, 9.83mm
> They are not listing any impedance and there is no datasheet available
> for this part number on google or other sites.
> Is there another preamplifier i could use ? a much better one than
> opamp solution adopted by the schematic i attached in my previous
> message ?

Too many questions.  There is nothing wrong with an electret mic.  Read the
data sheet to see how it needs to be driven, then drive it that way.  As I
said before, I think you should have more gain in your amplifier and it
should be AC coupled between stages.


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