Re: audio amp with dc output?



Charles Rowe wrote:

I've been away from designing circuits for about a decade, so my knowledge
of current components is, well, nonexistent.

I want to make a device that amplifies a signal from a microphone and puts
out a dc signal up to 3 volts based on the sound volume. 50mA should
suffice. 3 volt supply for the circuit.

3 volts is a lowish supply for good audio noise performance (should that be
important) and introuces certain other issues. You may need an internal DC-DC
converter to supply some more useful internal voltages.


This is my first post here. I hope it fits within your guidelines.

Any and all help is greatly appreciated!

You need a mic preamp followed by an active rectifier using at least one
moderately high output current op-amp.

You will need to define the attack and decay time constants required for your
application.

Graham


.

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