Yes!I am design a circuit to control the output signa.I want to make the output a fixed value with the dynamic input. the circuit is used in the audio amplifier circuit!
**broken link removed** is a previous discussion on the general topic of AGC. The material can be applied to your situation.
Take special notice of the delayed method in the topic. Usually you do not want to make the gain change range so high that the amplifier hiss comes out when there is no program material.