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  1. M

    sound to current or voltage amplifier

    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...
  2. M

    sound to current or voltage amplifier

    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...
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