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Ask an Expert Forum I have a small audio amplifier project I am working on.
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I have a small audio amplifier project I am working on.

rcayot
rcayot over 2 years ago

  The power amplifier requires 12v ac *2 which I am providing via a 24v CT transformer.  I also have a preamplifier board which requires 12vDC for power.  I was wondering if I could tap each 12 feed for the power amp, and run each through a diode followed by a capacitor, would that rectify the source enough to be considered 12VDC?  If so, what value of cap do I need?

Roger

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  • shabaz
    shabaz over 2 years ago +4
    It depends, but since a preamplifier might not consume much current, around 2200uF could be fine. However, the output won't be at precisely 12V, it will be a bit higher (as you'll see with a multimeter…
  • michaelkellett
    michaelkellett over 2 years ago in reply to rcayot +3
    The power supply voltage won't affect the gain of the power amplifier. There are some suggestions about changing the pre-amp to have a gain of 1 here: https://theartofsound.net/forum/showthread.php…
  • shabaz
    shabaz over 2 years ago in reply to rcayot +2
    Hi, You mention it is a 24V CT transformer, and that you wish to rectify it to 12V DC, so it can be wired as shown: If you actually have access to the amplifier circuit and can identify a 12V DC…
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  • dougw
    dougw over 2 years ago

    It should work fine as shabaz  indicates. Just remember to put an ac coupling capacitor between the preamp output and power amp input signals.

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  • rcayot
    rcayot over 2 years ago in reply to dougw

    These amps are made to work together sort of.  Each has its input and output stages set up to work with line stage voltages.  The volume control is on the pre-amp.

    Roger

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  • rcayot
    rcayot over 2 years ago in reply to dougw

    These amps are made to work together sort of.  Each has its input and output stages set up to work with line stage voltages.  The volume control is on the pre-amp.

    Roger

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