combination oscillator, PWM with throttle and gate drive circuit for doing nasty things
from left to right
U1: lm239 dual comparator
Q1: BC945
Q2: BC337
Q3: PN100
Q4: PN200
Q5: IRFP250 (the gate capacitors are just for simulation)
not shown are the 1kΩ pullups on the comparator outputs.
frequency is set to 7.5kHz and duty cycle is throttled to about 80%
