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Audio Amp

Discussion in 'Electronic Basics' started by sahil, Sep 25, 2006.

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  1. sahil

    sahil Guest

    Hello friends .Its sahil wants ur help. I am currently using an audio
    Amp of transistor 2N3055 .It uses two transistors for one channel
    ..Transformer is of 12-0-12 , 5A .I am not satisfied with the amp
    performance.I want some what powerful amp schematic whose transistors
    are easily available .I want to drive 12" SUB WOOFER. Hey I hope U are
    the person Who can HELP me......Reply .........
  2. YOu asked this before, on Sept. 14. There were a fair number of

    There is no reason to ask again until you've actually read the previous

  3. Jamie

    Jamie Guest

    you can buy them cheaper than making them..
    if your using 12 volt system, you need an inverter to bump up
    the voltage and a 2 or more channels bridge together driving the
    lowest impedance speakers you can find.
    happy woofer thumping.
  4. Bob Masta

    Bob Masta Guest

    Hmm, do you mean one channel uses 2 x 2n3055, *plus* a
    few other transistors? The best 2n3055 design I have used
    is a pseudo-Darlington that uses a small PNP to turn one
    2n3055 into a fake power PNP so you can have a push-pull
    output stage. (The other 2n3055 uses a small NPN in a
    normal Darlington.) The amp runs class AB. If you are
    running your devices class A, then that is one area where
    you are losing a lot of efficiency. On the other hand, as
    others have noted, you need more volts to get more
    watts, and running in bridge mode is best of all.

    You can measure the output swing you are getting
    to see if it is taking full advantage of your +/-12 supplies.
    Note that for subwoofers you may need big supply caps
    to handle low frequency current demands. If you can
    swing +/-8 volts from one amp, that's pretty good.
    You can then bridge two amps to get +/-16, which is
    4x the power into a fixed load. Beyond that, you
    just need more volts.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    Home of DaqGen, the FREEWARE signal generator
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