What i want to do is detect when an audio signal is present .
eg . sound from a mic or guitar (low level input)
My method is ....
(MIC) > (PREAMP CIRCUIT / OPAMP) > (SINGLE STAGE RECTIFICATION) > (ARDUINO ANALOGUE IN )
and my code would just say :
if ANALOGUE IN is > a ref voltage then do events ect.
Any ideas or better suggestion?
and if my method is good some suggestions on a good amplication stage would be good .
cheers
luke