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The Spot welder are uses for welding li-ion 18650 bataries. Assembly of the device for spot welding of nickel tape DIY from an old UPS and a car battery using powerful transistors and the timer ne555.
Scheme github.com/AlexMalov/Dotwelde...
Transistors en.aliexpress.com/item/329665...
Mosfet driver TC4420 www.chipdip.ru/product/tc4420cpa