All your circuit should work.
Quote from: dhenry on Jan 13, 2013, 03:58 pmAll your circuit should work.But they don't and I don't know why.
I found a TDA2822M and the datasheet says its some kind of amplifier. Is it useful for this project?
Can I use a microphone like this without any additional circuit?
I dont have one, so I'd rather make one out of parts I already have.
Nobody else knows why either... We don't know if the problem is in your microphone, amplifier circuit, or in your firmware/sketch, or somewhere else... In order to troubleshoot your project, you need to test the individual sections and "zoom-in" on the problem.
What's happening? Anything?
Do you have a multimeter to measure the signal out of your microphone amplifier? Maybe try putting +5V on the Arduino input to make sure the Arduino and the firmware are working. (With 5V, I assume the VU meter will max-out.)