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  • DIY CD Spot Welder - Part 1 19 days ago

    @Westpol, Yes, you are right - that's why my 3x4700 uF (electrolyte) @ 20 volts can make one weld per charge because of high current for a fraction of second.

  • DIY CD Spot Welder - Part 1 24 days ago

    Only one weld every time and energy output only 3 Joules @ 20V. But it welds. Yap, super cap will allow you multiple welds, more power but electrolyte charges with in seconds and cheap. I am just sharing my experience. The 1F,5.5V supercap I tried was probably a dud, only gave few 100mA short circuit current.

  • DIY CD Spot Welder - Part 1 24 days ago

    Normal electrolyte capacitor might work too for the job.

    I was goofing around with 3 paralleled 4700uF, 35V capacitors. Those puppies were charged around 20 volts, shorted 'em, wire got spot welded between +/- legs and the spark was like fireworks !

    Capacitor energy is 1/2*C*V^2 , so increasing voltage gives more energy than farad.
    I don't know about the supercaps you have, but in my experience some supercaps have high ESR than electrolyte ones. High ESR of few ohms can hamper spot welding.

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