DIY Arduino Battery Spot Welder PCB Set V2.2


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SKU: sw-pcb-v2.2 Category:


This is the new V2.2 PCB Set.

Improvements in the V2.2:

  • Mosfet PCB now with 2oz copper layer and wider traces which connect the high current carrying mosfet legs to the u-shaped aluminum part
  • little bit bigger mounting holes for u-shaped aluminum piece (2.6mm instead of 2.5mm)
  • “AutoPulse” feature, which automatically activates a pulse after a 2 second delay when both welding tips touch the nickel strip (thanks to Petr Zverina for the idea)

The mosfet pcb update was done because some users who tryed welding with more than 1000A current reported that the pcb traces got damaged by the high current. Now it should be more resistant even to these very high currents.

The new “AutoPulse” feature only needs 5 small additional parts on the pcb. (470 Ohm resistor, 620 Ohm resistor, z-diode 4,3V 0,5w, 2,54mm jumper, 2 pin 2,54mm male header). Resistor R13 does not need to be populated. It was meant as a pull down resistor, but after looking close to the schematic i realised R14 + R15 already do the pull down to GND.

To activate the “AutoPulse” feature simply plug a jumper on the male 2 pin header named “Auto_Pulse” which connects the two pins.

For more instructions to the “Auto Pulse” feature check out the blog post.

What you get:

The two PCBs needed to build your own spot welder.

This is the pcb only set. No other components included.


How to built it:

Attention: R15 shows 620 on the PCB but needs to be populated with a 470 Ohm resistor

  • All pcb files, part list, Arduino code… can be found at my Github page.
  • A detailed bulit guide can be found at the instructables and in the video.

Additional information

Weight 19 g
Dimensions 60 x 51 x 1.5 mm


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