I have working a PWM output driving the input of a 0 to 200mV digital panel meter, but would like some input/review of the filter. I'm running the uP @ 4MHz, the PWM at 3.9kHz with 10 bit resolution and it seems to run just fine for my application but I'm not sure if I can improve on the RC filter, it was basically pulled from the net and I can't seem to find a good online design program to help.

I found by trial and error that the 1.46M voltage divider load worked well, any advantage / disadvantage to going higher?

Any comments would be appreciated.