For anyone who has Rev F (the latest rev) of the PWM board set, I have made important updates to the documentation for the overload shutdown board (and one easy component change).
Also added an overall modulator schematic showing all components including power supply, filter, switching, board interconnections and everything else that makes a complete modulator.
Added the sequencer schematic - lots of folks were asking for this.
The PWM documentation is here:
http://www.classeradio.com/newpwm.htm