DIY spot welders incessantly use high-powered elements that may be a bit of horrifying, given the potential of bad malfunctions. [Wojciech “Adalbert” J.] designed his capacitive discharge spot welder to be secure, simple to construct, and forego the microcontroller.
Many initiatives paintings nice with only a unmarried Li-ion mobile, but if you want extra energy, you’ve were given to begin connecting extra cells in combination right into a battery. [Wojciech]’s spot welder is designed to be simply tough sufficient to weld nickel tabs onto a mobile with none overkill. The capacitor financial institution makes use of nineteen Nichicon UBY 7500uF/35V capacitors, all stressed out in parallel the usage of solder wick saturated with solder. They sit down atop on a perfboard with metallicized holes to hold the excessive present.
[Wojciech] has detailed each step of creating the welder, together with adjustments to the off-the-shelf relay board and including a potentiometer to the step-up converter board. The extent of element makes this look like a just right beginning position in the event you’re hoping to hop into the arena of DIY spot welders. Secure is at all times a relative time period when coping with excessive powered units, so watch out in the event you do strive this construct!