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46% OFF DIY Draagbare Batterij Opslagpunt Lasmachine PCB Circuit Board Lasmachines voor 18650 26650 12V US$18.99 US$34.99 View It

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Georgie 06/06/2022

One star removed because I had to add a component to make it work. The 8051 microcontroller was shutting down on every attempt to weld. I added a 470 uF capacitor across the 5V power rail supplied by regulator U1. Battery voltage was steady enough and not the main cause of this problem. Probably other capacitor values would work but I have not tested. If your board is shutting down (LED turns off) then try adding a capacitor as shown in my pic. This is on the newer rev of the board with opto-isolator (fat 4-pin chip).

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