AMPLIFIER CIRCUIT FOR MICROPHONE

HI…
I need an amplifier circuit for my electret microphone so that it is very sensitive to different voices.With microphone as analog input I should get wide range of numbers on serial monitor sensitive to different voices.

thanks for your help
Regards

try a INA217 as the basis for a mic pre-amp, you can get free samples from TI.com, and there's a nice pro-quality preamplifier on the datasheet http://focus.ti.com/lit/ds/symlink/ina217.pdf

I should get wide range of numbers on serial monitor sensitive to different voices.

If you’re trying to distinguish human voices with an Arduino, forget it.

You could however filter the signal, say with six band-pass filters and ‘recognise’ different voices from their spectral components. Even better might be to use the arduino fft library. I doubt it will actually provide per-person recognition, but with some tweaking you might be able to distinguish a male voice from a female’s, or a child’s voice from an adult’s.

Hi, Project 21 in my book '30 Arduino Projects for the Evil Genius' is a VU meter that uses a microphone for input, but you could easily adapt it.

If you want the source code for the sketch, you can get that without buying the book at http://www.arduinoevilgenius.com

There was a post on this forum somewhere where I posted the circuit, but I can't find it. You may have better luck.

Simon.