amplifier power supply

Discussion in 'Homework Help' started by rchandu, Oct 11, 2010.

  1. rchandu

    Thread Starter New Member

    Sep 28, 2010
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    what is the need to give power supply for an amplifier, does it convert into the form of ac signal, which is the input given by us.
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,738
    759
    Without PSU, the circuit will not work, no biasing, no out put...nothing.

    And yes from the power supply output is produced. Dc is converted to AC with respect to input.
     
  3. rchandu

    Thread Starter New Member

    Sep 28, 2010
    3
    0
    thanq...,
    can you send any schematic equations to let me understand the process exactly.......
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,738
    759
    It all depends on the amplifier tht U have in mind.
    Stereo or mono and Power requirements to the desired load.

    All in all a stereo one will need twice the current rating that is needed for the same mono amp.
    Current and voltage depends on the amp power rating.
    Voltage supplied from the PSU should typically 3 to 5V higher than the output voltage swing to prevent clipping at full output.

    Clipping will damage any amp plus speakers. And will also result in severe distortion.

    For further info go here .

     
  5. David Bridgen

    Senior Member

    Feb 10, 2005
    278
    0
    Where else would the output sound (the output power) come from?

    The power input to the amplifier, from either a battery or from a mains power source, is converted by the loudspeaker/s into audio power.

    The very simplified diagram aims to show that the amplifier's output stage/s and the loudspeaker are in series across the supply.

    During a positive excursion of the input signal current flows from the positive supply, the upper output transistor and the 'speaker.

    During a negative excurion of the input signal current flows from the negative supply, the 'speaker and the lower output transistor.


    [​IMG]
     
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