In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

Mr Bean,

I would advise that you place an op-amp based (TL082 ? ) active low pass filter to clean out the voice before it goes 
into the audio amplifier.  
This way you can even use 1pin PWM output safely without using the whole 8 pin port.

Sorry to have to recommend additional costs.   : (

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