My spot welder with tungsten electrodes is driven with DC from a bank of ultracapacitors.
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Spot Welder DC
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Category Archives: Low Voltage
Ultracapacitors
These ultracapacitors have a massively increased power density compared with conventional capacitors and this bank stores 50 kJ.
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Spot Welder AC
I made this as I thought I may need something to make joins for use in a vacuum that may get red hot. Epoxy and plain or silver soldering would not do. It uses a 6 V 90 A transformer and is able to spot weld a variety of mostly thin metal sheets.
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Homopolar Motor
Homopolar motor made with 4 common household parts.
This homopolar motor has 4 components and takes seconds to make. Running here at 5800 RPM. It ran for 2:35 minutes once the power is off because the bearing is only a point with much of the weight taken off by gravity.
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Power Supplies
My sentimental favourite power supply was made in 1971 and was developed over the years. It appeared in the local newspapers 8 times as a backdrop to photos about two of four state wide talent quest prizes I won between 1970 and 1973.
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MOT low voltage rewind
A microwave oven transformer can be used for a powerful low voltage supply.
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Marinov Motor
For a morning diversion from my other projects, I made a Marinov motor. This is a motor that is simply two ball races and an axle.
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Low Voltage (But High Current)
Low Voltage
One volt can be impressive too. Check out the 533 A current on the clamp meter from this transformer (above). It is a show of power when melting iron strips with low voltage.
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Big Silicon Controlled Rectifiers
I have a number of big silicon controlled rectifiers (SCR’s) of the “hockey puck” type.
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Zamboni Battery
I have been keeping an eye out for suitable materials to make a Zamboni battery. The battery above uses small strips from discarded medical ECG electrodes to generate 2.9V.
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