Can't get sound detecting circuit to work with picaxe 28x1
July 23, 2010
Greetings from Finland
I am trying to build this sound detecting circuit from picaxes homepage to use with a picaxe 28x1. ( http://www.rev-ed.co.uk/docs/picaxe_sound.pdf )
I have breadborded the circuit and double checked every connection. The problem is that it won't react to sound in any way. I wrote this code:
readadc 1, b1
The reading (b1) I get from the debug window is changing when I turn the pots but it does not react to sound. I have swapped out all the transistors and the pots and tried another microphone without any difference.
I am not sure that I understand how the adjustment on this circuit works, but I have bean playing around with the pots a lot and at no point have I got this circuit to react to sound.
Any help is highly appreciated!
I breadborded the whole circuit from the beginning and the same problem. It is got to be something simple that I don't understand. This is driving me crazy! The only components I could have placed the wrong way is the microphone, diode and the transistors, but according to the datasheets they should be alright. hmm...