Looking again at the circuit "voltage amplitude control" there is something adjusting the voltage amplitude when GATE is ON.
When resonance maintained is active (pulse frequency) there is little or NO step charge. Voltage is PULSED on resonance never long time 0V but always pulsing between 0V to 54a.
When voltage amplitude is higher in the GATE ON time 53n there is step charge. The gas production can be regulated because voltage amplitude is regulated on user level (gas pedal).
This voltage going into the TIP120 transistor is variable in the GATE ON time, but never 0V level.
When PULSE is 0V there is no amp restriction on resonance, so there always should be a pulse signal on minimum voltage amplitude.
"Resonance Action" is adjusted with the GATE duty cycle and gas production level with the voltage amplitude.
Any comments?
Br,
Webmug