Uploaded May 2025 | Updated September 2026, 2 weeks ago
!!! Caution !!!
Working with negative spike can hurt/kill you, or damage your mosfet and other equipment, due to high voltages.
Therefor experiment at your own risk, and only if you know what you are doing.
The purpose of this experiment was originally for something else I want to look into, but what I saw was to interesting.
I saw 3 important things:
1) The current draw from power supply was very low when using the spike (20mA) compared to the high current (600mA) when spike was not used at the 34Khz input.
When doing the same at 1Khz there was not that much difference., the current stayed around 20mA with or without the use of the spike.
2) The magnetic field was bigger with the use of the negative spike. This is shown by the 2 led's in anti parallel connected to 3 small coils with ferrite core in series.
Allthough I had 30 times more current when not using the spike, the magnetic output of the main coil was lower then with the use of the negative spike.
This was the case at both frequencies 1Khz and 34Khz.
3) The polarity of the voltage that the 3 small coils from point 2 put out, is different on each side of the main coil. (shown by red and blue led) (this is important for my original experiment)
For the left side this was at both frequencies of 1 and 34khz.
The right side, where only the blue led lighted up at 34Khz, the red led was also lighting up very dimmed at 1khz.
In this setup there was no resonance.
What you see are the results at 34Khz with 50% duty.
When using only 1Khz, I had to lower the duty to 10% and voltage was much higher on the 2 receiving coils, the spike value is much higher at lower frequencies.
As an extra experiment I placed the stick with the 2 led's in antiparallel at a certain distance and looked at what I had to do, to get same brightness at 1 and 34Khz, when using the spike output:
1Khz ; 10%duty ; 12V ; 0.025A ; 0.29W ; +-800V spike
34Khz ; 50%duty ; 15V ; 0.019A ; 0.28W ; +-500V spike
For the magnetic output I have to use around the same power input the light up the led's on the polarity check stick.
However the big led on output was lighting up very well at 1Khz while barely at 34Khz, for same power input.
As an extra experiment I build myself a simple device to look at magnetic force difference.
It's just something I tryed because I know this is far from accurate.
youtu.be/uncIqp9nasI
!!! Caution !!!
Working with negative spike can hurt/kill you, or damage your mosfet and other equipment, due to high voltages.
Therefor experiment at your own risk, and only if you know what you are doing.
The purpose of this experiment was originally for something else I want to look into, but what I saw was to interesting.
I saw 3 important things:
1) The current draw from power supply was very low when using the spike (20mA) compared to the high current (600mA) when spike was not used at the 34Khz input.
When doing the same at 1Khz there was not that much difference., the current stayed around 20mA with or without the use of the spike.
2) The magnetic field was bigger with the use of the negative spike. This is shown by the 2 led's in anti parallel connected to 3 small coils with ferrite core in series.
Allthough I had 30 times more current when not using the spike, the magnetic output of the main coil was lower then with the use of the negative spike.
This was the case at both frequencies 1Khz and 34Khz.
3) The polarity of the voltage that the 3 small coils from point 2 put out, is different on each side of the main coil. (shown by red and blue led) (this is important for my original experiment)
For the left side this was at both frequencies of 1 and 34khz.
The right side, where only the blue led lighted up at 34Khz, the red led was also lighting up very dimmed at 1khz.
In this setup there was no resonance.
What you see are the results at 34Khz with 50% duty.
When using only 1Khz, I had to lower the duty to 10% and voltage was much higher on the 2 receiving coils, the spike value is much higher at lower frequencies.
As an extra experiment I placed the stick with the 2 led's in antiparallel at a certain distance and looked at what I had to do, to get same brightness at 1 and 34Khz, when using the spike output:
1Khz ; 10%duty ; 12V ; 0.025A ; 0.29W ; +-800V spike
34Khz ; 50%duty ; 15V ; 0.019A ; 0.28W ; +-500V spike
For the magnetic output I have to use around the same power input the light up the led's on the polarity check stick.
However the big led on output was lighting up very well at 1Khz while barely at 34Khz, for same power input.
As an extra experiment I build myself a simple device to look at magnetic force difference.
It's just something I tryed because I know this is far from accurate.
youtu.be/uncIqp9nasI
