Electret microphone

LM386 and electret circuit.

Tonight's project was to try out the LM386 together with the electret microphones I intend to use in my radio-beacon project. The microphones are intended to listen to a specific signal and provide the time difference between a radio signal and sound to give me a distance between the sender and the radio-beacon.

I had some issues getting this circuit to work. After much work I realized the electret microphone was not attached all the way into the breadboard. After that it worked as intended. But even with this success I have some doubts that the intended use will work. Well next time I will attach the speaker to another Arduino and see if I can receive the sound and perhaps measure the time it traveled.

Links to circuit´s:

http://lowvoltage.wordpress.com/2011/04/23/lm386-audio-amplifier/

http://lowvoltage.wordpress.com/2011/05/15/lm386-mic-amp/

* http://www.electrokit.com/productFile/download/55

Hardware:

http://www.electrokit.com/electret-mikrofon-o9-7-x-6-7mm.43370
http://www.electrokit.com/productFile/download/753

http://www.electrokit.com/lm386n1-dip8-0-5w-forstarkare.41735

Code:

https://raw.github.com/lowvoltage/Miscellaneous/master/minmax.pde