> 2. PWM in software

Barry, I have a PIC running at 40MHz that puts out 6-bit PWM
from 100Hz to 279Hz

http://www.piclist.com/techref/microchip/HV_PWM_Proto.htm

Both frequency and duty cycle are pot-controlled

There is plenty of spare processing power and could be expanded
to 7-bit or faster/slower speeds

One pot sets the reload value for TMR0, the other sets the ratio
of 'off' and 'on'

Joe
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