This is a Royer oscillator which is a relatively high power self resonant circuit useful for generating high voltages from flyback or other ferrite transformers. Output is probably around 2000 VAC. The arc stretches out to about an inch at a power of up to 300 W.
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Here is a fast, cheap and generally safe project for beginners sparks with a minimum component count. It uses an ignition coil from a car.
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This voltage multiplier 80 kV has a 5 inch corona with intermittent sparks in this 3 second exposure.
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Car ignition coils make great spark sources. After all they were designed to power a spark plug. Now, put two of them out of phase and the sparks are doubled in size. Here are some examples.
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I needed a voltmeter for HV to be able to be seen from a distance at night. Here is my digital voltmeter with HV probe reading 13.06 kV. “Continue reading” for more details and photos. Continue reading
A nice 60 kV transformer and heavy dual variac for the kids to play with is on my list of high voltage projects to do. Here are some more of them.
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This is based on a TV flyback coil and a single 2N3055 power transistor and other on-hand components giving a 1/2 inch spark at 20 V 3 A input.
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Don’t put your hand in this one! This uses a disposable camera photoflash running off 3 V using a BD140 and heatsink substituted for the main HV transistor so it can now run at 1.5 A.
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These are odd little high voltage generators which are in principle, part Blumlein generator (like the nitrogen laser uses) and part induction coil. They are compact and easy to make.
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This can crusher display crushes cans in milliseconds using a very high current pulse.
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