July 05 -- Pulse width modulation controller for heater fan speed. RV1 replaced by a set of 4 resistors switched by the Z3 donor's heater knob. Resistance values chosen to give a range of fan speeds ranging from just above stall to max at about 1.2Amps. Diode 2 gets very hot - I added a second diode in parallel to keep the temperature down.
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