ZVS stands for Zero Volt Switching. If this circuit doesn’t start on it’s own shake to start. This circuit is inspired by the circuit from this ElectroBOOM video: https://www.youtube.com/watch?v=hFJeIt_JcEc
By adding the diode at the top to provide a voltage drop it doesn’t need an initial kick to start it. As an unintended side-effect it stabilizes the power consumption making it consume a somewhat constant amount of power instead of a strong push/pull with a little more pull than push. It also makes the voltage much higher since it can’t feed back into the power supply when the voltage is above 12V. In order to keep the voltage from getting too high and destroying something I made the diode a Zener diode to be safe, although it doesn’t seem to rise too high even without the Zener.
