PWM audio driver

Discussion in 'The Projects Forum' started by yardleydobon, Sep 6, 2011.

  1. yardleydobon

    Thread Starter Member

    Apr 19, 2009
    19
    0
    I want to amplify PWM audio I'm outputting from a microcontroller. I want to play it on an 8ohm 0.5W speaker. Can someone recommend how I should do this?

    I think something like a class D amp output stage chip is what I need, but I can't find one that meets my requirements. I need it to run at 5V. Does anyone know of one that will work for me?

    I tried making a push pull circuit out of 2N7000s but it was still quiet. Would I have better luck with different transistors?
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    Show a schematic, and we might be of more help.

    Pulse Width Modulation

    It sounds like you need a different driver, something more push pull-ish.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You might just use an RC low-pass filter to change the PWM to a pseudo-sine wave, and just use an inexpensive LM386 audio amplifier.
     
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