| OK, I know I'm getting obsessed with the FPC so sorry for all the posting. Just wanted to show the PWM operation . Here are some pictures I took while monitoring the speeds using my digitizing O-scope. I offset the trace to make it easier to see the start and stop markers. The way that PWM works is, the wider the pulse the faster the motor speed. So the higher the frequency, the closer the pulses will be to each other, and the slower the speed will be. This first picture is during low speed. Just a note. I was using a fixed power supply during this test and it runs close to 15 volts. I did not adjust the scope offset to run the zero line for these pictures, sorry. The grids are currently set to indicate 5 volts per division. At low speed the pulse width frequency is around 76 hz.
 This picture is during medium speed. At medium speed the pulse width frequency is around 52 hz.
 At high speed the MOSFETs are saturated and the voltage to the pump is wide open. Ignore the stop and start markers. They are just reference and still set from when I took the picture at slow speed.
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Some more info on the FPC operation. - 
