|LM386 and electret circuit.|
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: