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Audio amplifier

Discussion in 'Electronic Basics' started by sahil, Sep 14, 2006.

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  1. sahil

    sahil Guest

    Hi ,

    I am using an audio amplifier of transistor 2N3055 .It uses two
    transistors for one channel and 4 for two channel amp.I have two
    channel amp with 4 transistors and using it with computer.The woffers
    used are one is 10 inches and other is 12 inches .I want to increase
    the power of amp.What i shoud do ? i am using 12-0-12 ,1A
    transformer.Help me to inprove its performance.........
     
  2. Chris

    Chris Guest

    Hi, Sahil. Sadly, you can't increase the performance of your amplifier
    by replacing the two output transistors. A higher voltage transformer
    won't do the trick, either. All that will do is make the transistors
    run hotter, and possibly burn them out.

    If you need more power, you might look at getting another amp.

    Good luck
    Chris
     
  3. BobG

    BobG Guest

    More power means more volts and more current. You could put beefier
    transistors that handle twice the current and run 4 ohm speakers
    instead of 8, but this assumes that the guy that specified how many
    watts in the transformer was an idiot and bought a transformer that was
    twice as big as what was needed just in case you might need some spare
    power. Not likely. The transformer isnt going to magically start
    producing 200 watts if it was designed to have just enough iron and
    copper to produce 100 watts. So once you change the transformer and the
    output transistors, you have rebuilt the whole amp.
     
  4. BobG

    BobG Guest

    More power means more volts and more current. You could put beefier
    transistors that handle twice the current and run 4 ohm speakers
    instead of 8, but this assumes that the guy that specified how many
    watts in the transformer was an idiot and bought a transformer that was
    twice as big as what was needed just in case you might need some spare
    power. Not likely. The transformer isnt going to magically start
    producing 200 watts if it was designed to have just enough iron and
    copper to produce 100 watts. So once you change the transformer and the
    output transistors, you have rebuilt the whole amp.
     
  5. You need to redesign the amplifier and rebuild it. Simple changes of parts
    won't alter the performance.
     
  6. Jamie

    Jamie Guest

    get a bigger amp and speakers.
     
  7. Eeyore

    Eeyore Guest

    Provided 2N3055s have enough heatsinking, they're easily capable of 50W output.

    Graham
     
  8. Eeyore

    Eeyore Guest

    Depending on the design of the amp and other devices used, you simply need to
    increase the supply voltage.

    A 24-0-24 supply would increase the power output by around 4 times.

    It's essnetial to provide good heatsinking though and all the active and passive
    devices need to be rated for adequate voltage and dissipation when working at
    the higher voltage.

    The general design of the amp would need to be looked at too to ensure there
    were no general issues at the higher voltage but this would often only amount to
    a few component value changes at most.

    These ppl who simply say 'it can't work' are talking nonsense btw.

    Graham
     

  9. 2n3055s can take 60 volts, so a higher rail to rail supply would
    double the output, if the first stages are fed at the right voltages.
    The old 40411 version was good for 100 volts, and used in a lot of early
    60 Watt audio amps in a quasi complementary circuit. RCA published a
    number of different schematics for different power levels for these
    types amps in their transistor data books all through the '70s.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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