Audio Amplification using microcontroller???

Thanks very much. You're quite right, a proper engineer tries to think of a way to get round a problem especially for someone starting off with some circuit. It is much more interesting anyway than just being given something that does the job. And as you say the clocks are high enough now to do a proper job rather than things like Baa Baa Black Sheep, the Lone Ranger music and Jet Set Willy.

Anyway if you want to do the simplest possible input as well you might I guess be able to make a successive approximation ADC by using two GPIO pins and a few resistors to balance the output against your input and the voltage range to match the bottom of the input hysteresis range of one pin and the top of the other. No I've never tried anything like that and make no guarantees but you might find it fun trying ;-)

Thanks very much. You're quite right, a proper engineer tries to think of a way to get round a problem especially for someone starting off with some circuit. It is much more interesting anyway than just being given something that does the job. And as you say the clocks are high enough now to do a proper job rather than things like Baa Baa Black Sheep, the Lone Ranger music and Jet Set Willy.

Anyway if you want to do the simplest possible input as well you might I guess be able to make a successive approximation ADC by using two GPIO pins and a few resistors to balance the output against your input and the voltage range to match the bottom of the input hysteresis range of one pin and the top of the other. No I've never tried anything like that and make no guarantees but you might find it fun trying ;-)