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help building function generator

Discussion in 'Electronic Basics' started by tempus fugit, Apr 12, 2004.

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  1. tempus fugit

    tempus fugit Guest

    Hey all

    I'm going to build a function generator using the MAX038 IC. Do the
    connectors for the output need to be BNC type, and do I need to use 50 ohm
    cables to connect things with, or will normal (shielded?) cable do?

    Thanks
     
  2. Well what are you using it for?

    At audio, the cable and the connectors will be less important than if
    you are using it to generate low radio frequencies. Maybe a signal
    generator in years gone by used banana jacks or 4-way binding posts.

    And if this is for home experimenting, it will matter less than
    if you plan to use it for precise work.

    On the other hand, BNC connectors are pretty handy. They are shielded,
    and yet are easy to connect and disconnect. They are likely to make
    a good connection, unlike some cheap connectors you might otherwise
    choose, and they certainly won't pull out by accident. They make
    for a standard connector, so you could easily make up different cables
    to work with them (ie one with a BNC connector on both ends, another
    with a pair of alligator clips on the other end, etc). I'd say
    the female connectors are infinitely reusable, I've never seen
    one go bad, so if you can scrounge up some used ones they should
    be cheap. And while wiring up the male connector looks like it
    might be complicated, it really isn't so long as you follow the
    directions.

    I suppose if I didn't have BNC connectors around, or a need
    for 50ohm impedance, I might be tempted to use Type F connectors,
    as seen in cable use. The connectors are likely to be more available
    (if nothing else one can pull them off tv sets and VCRs found in
    the garbage), and premade cables are available everywhere. They aren't
    as quick connect/disconnect as BNC, since they are threaded.

    Michael
     
  3. tempus fugit

    tempus fugit Guest

    Thanks Michael.

    This is definitely for home experimenting/troubleshooting, with an emphasis
    on audio. It will be a 20MHz generator, though (although I can't really
    forsee needing that much bandwidth), so it might be nice to have it set up
    to take advantage of the wide bandwidth. I also hope to use it to check caps
    for low ESR.

    Thanks
     
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