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Test Audio Amp

Discussion in 'Electronic Design' started by gene ohara, Jul 13, 2003.

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  1. gene ohara

    gene ohara Guest

    Would like to be able to quickly and easily test various output
    semiconductors and other critical components so am thinking of
    building an audio amp with sockets for these components.

    Appreciate any suggestions, especially by someone who has already
    done something like this.


  2. Ken

    Ken Guest

    A curve tracer won't work?
  3. Rich Grise

    Rich Grise Guest

    A couple of suggestions: If you test in-circuit, by mock-up, be
    sure to have a full set of known good components, or either a
    dedicated jig per part to be tested. IOW, test one thing at a

    2. A curve tracer can do wonders for semiconductors, and can actually
    give useful information for passive components (like, you can see the
    phase shift from Ls and Cs and stuff, you can see the Zener knee, it'll
    even do ordinary diodes.)

    In any case, Keep It Simple. IOW, I wouldn't recommend adapting
    a production-type amp to be a test bed - I'd build something from
    scratch, where I know exactly what each component is and etc. etc.

    Good Luck!
  4. bruce varley

    bruce varley Guest

    Using a 'hifi' amp design, with lots of feedback, would not be a good idea
    because the feedback will obscure any variations in the characteristics of
    the devices. Any testing should be done outside a feedback loop if you want
    to maximise the sensitivity of your testing.
  5. gene ohara

    gene ohara Guest


    Sounds interesting where do I get more info.

  6. gene ohara

    gene ohara Guest

    Thanks everyone for your input.

    Forgot to mention am not trying to break new ground in audio amp
    design but only want to find out how subsitution of cross referenced
    components affect the amps's performance.

    Would keep one channel stock and only change one thing at a time with
    the other channel.

    Hopefully someone else has already done this.

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