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Anybody know how to build guitar amplifiers?

Discussion in 'Electronic Components' started by 12 String, May 24, 2007.

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  1. 12 String

    12 String Guest

    I've got some schematics published in this month's Make magazine. What a
    hoot! Build an amp using a cereal box as the case.
    So here's one of my first questions I hope somebody can discuss.

    Does the type and capacity of a battery affect an amplifier's ability to
    output volume? Some of the teeny little practice amps run on a 9v battery
    but can't be heard well outside. Given the other concerns being met is it
    possible to get more volume using a different power source such as a battery
    from a laptop computer typically 10.8v or some other battery type with
    greater voltage?
     
  2. Eeyore

    Eeyore Guest

    Very much so. Larger capacity batteries have lower internal resistance and that
    equates to the voltage sagging less when some power is demanded, so it sounds
    louder.

    Internal resistance will vary with battery 'chemisty' too.

    Graham
     
  3. Yes of course. You'll do much better if you use a lead-acid truck
    battery. And if you can lay your hands on an old submarine battery
    you'll be able to play really loud.
     
  4. Marra

    Marra Guest

    I design and build my own amplifiers.
    My current one is used for a disco and a guitar.
    I play along to CD's in pubs and clubs.
    My latest amp is 600 watts RMS.
    It would need a pretty big battery LOL

    It uses a differential amplifier driving some 20 amp MOSFETS
     
  5. Eeyore

    Eeyore Guest

    The last MOSFET amp I designed has *24* mosfets and was rated at 1200W at the
    nominal load impedance and 1600W into 2 ohm loads.

    I've designed bigger bipolar amps since (up to 2kW)

    Graham
     
  6. Yes. Either use D cells or a small 12 V sealed lead acid battery for more
    power, and design an amp around that.

    Try (build your own portable guitar amplifier) or look at
    http://www.smokeyamps.com/
     
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