Uploaded June 2025 | Updated September 2026, 2 weeks ago
!!! High Voltage in this setup, experiment at your own risk and only if you know what you're doing. !!!
In this video you can see that with different frequencies it's possible to get the same kick back voltage by adjusting the duty cycle of the input pulse.
Overview of measurements:
400hz 2%duty 0.03W 4.79V 0.007A 767Vpk Kick back Voltage
1Khz 5%duty 0.1W 4.79V 0.022A 767Vpk Kick back Voltage
1.5Khz 7.4%duty 0.15W 4.79V 0.033A 767Vpk Kick back Voltage
The wattage rises because we have more pulses per second, but each input pulse on it's own has the same power in it.
The 3 capacitors in parallel to the mosfet have the consequence that peak voltage is lower, however the duration of the pulse (pulse width) is longer in that case.
I think we can conclude that if we give the same time for different frequencies for the magnetic field to build up to the same strength, we will get the same kickback voltage.
As someone mentioned to me, when we do measurements of the kick back voltage, we always see that it's positive in reference to gnd of input circuit.
I don''t know the history behind why it's always called negative. One could say because higher impedance will give higher voltage, but in normal voltage devider the highest resistance also get's the highest voltage.
It's one of those things that you hear every time, but not exactly the real background, also not the real properties in detail.
!!! High Voltage in this setup, experiment at your own risk and only if you know what you're doing. !!!
In this video you can see that with different frequencies it's possible to get the same kick back voltage by adjusting the duty cycle of the input pulse.
Overview of measurements:
400hz 2%duty 0.03W 4.79V 0.007A 767Vpk Kick back Voltage
1Khz 5%duty 0.1W 4.79V 0.022A 767Vpk Kick back Voltage
1.5Khz 7.4%duty 0.15W 4.79V 0.033A 767Vpk Kick back Voltage
The wattage rises because we have more pulses per second, but each input pulse on it's own has the same power in it.
The 3 capacitors in parallel to the mosfet have the consequence that peak voltage is lower, however the duration of the pulse (pulse width) is longer in that case.
I think we can conclude that if we give the same time for different frequencies for the magnetic field to build up to the same strength, we will get the same kickback voltage.
As someone mentioned to me, when we do measurements of the kick back voltage, we always see that it's positive in reference to gnd of input circuit.
I don''t know the history behind why it's always called negative. One could say because higher impedance will give higher voltage, but in normal voltage devider the highest resistance also get's the highest voltage.
It's one of those things that you hear every time, but not exactly the real background, also not the real properties in detail.
