My earliest can crusher. Can crushing is a sudden constriction of a can using very high induced current.
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Can Crusher 1
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Category Archives: High Voltage
Jacob’s Ladder from Microwave Oven
A Jacob’s ladder is driven by a voltage boosted microwave oven with a few steel wool sparkles thrown in for effect.
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Jacob’s Ladder with Water Electrodes
A Jacob’s Ladder with water electrodes is formed between two streams of salty water and gives a bright orange colour.
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Can Crusher 3
Can Crusher 3 is now boosted to 3 kJ and mounted into a microwave oven case.
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100 kV DC (dental x-ray unit)
100 kV DC gives 5 inch sparks from a voltage multiplier driven from a dental x-ray transformer.
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Measurement of High Current Pulses
Measurement of High Current Pulses (or my multimeter doesn’t have a 100,000 amp scale). The upper trace shows a peak current of two squares (20,000 A) and lower trace a peak voltage of nearly 2 squares of around 5 kV. Note how the current lags behind the applied voltage.
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Jacobs Ladder
A Jacobs ladder is an arc that forms between two upright electrodes that are wider at the top. The arc starts at the bottom and rises with the heat of the arc becoming progressively larger until it “breaks” at the top. It then reignites at the bottom to start over again.
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Measurement of Current WITHIN the Can
It is of interest to know the current induced in a can at the time of can crushing. This can be done by direct measurement of current with a Rogowski coil or by measuring voltage drop in the can.
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Measurement of High Voltage Pulses
I have now measured the high voltage pulses during can crushing (lower trace). The lower trace shows 2000 V peak with around 75% voltage reversal. Current in the upper trace is around 12,000 A.
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Circular Jacobs Ladder
A dual concentric magnetically driven circular Jacobs ladder. The sparks form in one spot but rotate due to the magnetic field.
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