PWM audio driver

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yardleydobon

Joined Apr 19, 2009
19
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?
 

SgtWookie

Joined Jul 17, 2007
22,210
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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