Hi! First off, thank you so much for any help. I am slowly learning electronics and arduinos etc... maybe one day I will be smart enough to help people on here.
I am attempting to build the audio detection circuit found here: http://www.picaxe.com/docs/picaxe_sound.pdf
I arranged it all on a breadboard and I thought I did everything perfect... I am powering the circuit by the 5v from the arduino. The output (0-3v) is connected to an led. presumably the led should turn on when the circuit detects sound.
It does not turn on at all no matter what sound is made. I have tried changing the sensitivity of the two potentiometers. I have also hooked up the output to a multimeter. it reads 0.52v no matter what sound is made or setting of the potentiometers.
Here is a high quality picture of the set up. Since some of the pins under the transistors and capacitors cannot be seen, I drew them in orange: http://i50.tinypic.com/r877r6.jpg
Let me know if you have anymore questions.
Thank you for any help!