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audio amp question

Discussion in 'Electronic Basics' started by Dan Stephen, Sep 26, 2004.

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  1. Dan Stephen

    Dan Stephen Guest

    I have a client who is looking for the following:

    a 9 volt audio amplifier into which a microphone and headphones plug.

    The purpose is for him to be able to speak to a man who is extremely hard of

    Any ideas for a cheap circuit?

  2. Graham Knott

    Graham Knott Guest

  3. Roman Arnet

    Roman Arnet Guest

    I he going to blow up his ears?!
  4. BobGardner

    BobGardner Guest

  5. Rich Grise

    Rich Grise Guest

  6. Dan Whelan

    Dan Whelan Guest

    Ok, seriously, I suggest staying away from building a hearing aid.
    It's not about one's skill's more about who's going to be
    the one blamed if something were to go wrong. It doesn't matter if
    your circuit is the cause.

    That being said.....

    Williams Sound has made some products called "assistive listening

    I'm not sure how willing they would be to part with their schematics,
    but there you have it.

    Other than that, if you're still interested in making the device...

    You can combine a mic pre-amp with a generic op-amp amplifier circuit
    for headphones to accomplish the same thing. A good source for
    schematics is

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