On Sat, Oct 8, 2011 at 3:35 PM, Michael Watterson wrote= : > At 80kHz 16bits is 1/65K mark space and clock interval over 5MHz. 16bits > is not "free". Unless you are doing "hiFi" consider 8bit to 10bit (clock > 256 to 1024 times frequency). Ok. This will teach me to do the math before posting. I'm not sure I follow yours, but if I use a 16 MHz base clock and 8-bits, I'm already down to 62,500 kHz PWM -- if I have my math right. And suddenly I realize the advantage of CCR units that can multiply the system clock as well as divide from it, and why uCs are generally not used for real Class D amplifiers. Despite this, I still believe the design should be just fine for my application, in addition to being a great learning tool -- which is why I am really doing this, of course. -p. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .