Martin McCormick wrote: > Assuming that the RC time constant of the low-pass filter is > long enough to smooth out the PWM ripple, is the relationship between > output voltage and duty cycle a linear percentage of the voltage based > on the percentage of the duty cycle? Sort of. Yes, if the 'output' is unloaded (as Scott and Olin have stated.) Dave -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu