Hi Audio guru.
thanks for the amp diagrams, the microphone I will use will probably be something salvaged from an audio system. What I will do is aquire an amp connect it to the mic run the machine and see what value the amp output is and then scale the panel meter...
I am looking for help to design an amplifier which will take the output from a microphone and amplify it to a milliamp or millivolt signal suitable to input to a process panel meter. The meter will accept 0 to 20 milliamp 0 to 199 millivolt 0 to 5 volt 0 to 10 volt etc and has a 10 or 24 volt...