I'm not that good? Would it require much more than a cap or two and resistors?
IIRC vanilla PWM is 490 Hz variable width pulse, or is it closer to 500 Hz?Couldn't the same low-pass filter work for 0-100 PWM?
RC = 1/2piFF = 1/2piRC
Yes but vanilla Arduino PWM has a default full cycle that doesn't change the clocks. It should be fast enough.But as I read, how fast I want to change the PWM -level- (assuming like 10% duty cycle to 90%) is more the deal? QuoteRC = 1/2piFF = 1/2piRCDoes this frequency limit how smoothly DC output will change as PWM level changes?If so, that would be the smoothness the audio circuit the filtered PWM could change frequency as well as how fast I could jump from one note to another.
But trying to generate variable audio frequencies via PWM output is just not a very practical solution in my mind.