More in depth details and suggested mod for this "Purple" PCB Mini Spot Welder!
Please be aware that an updated (thankfully - someone at the dev dep must be paying attention to my channel!;) version of the Purple Mini Spot Welder is being shipped as of beginning ofJanuary 2024 and has the Opto Decoupling mod already applied so you don't need to modify anything on this version. You can tell if you have the updated version by the lack of the trace going from the opto across the silk screen to the positive contact - the updated version lacks this and has an additional trace on the back side of the pcb going towards the 470uF decoupling cap near the diode where it connects. Check out the community section for more detailed pics of the 2 boards.
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FYI In the video I list the necessary components and the text omits the 1N4148 or 1N400x diode (but I mention is several times).
Aliexpress link (highly suggested to purchase model with plexiglass casing):
https://www.aliexpress.com/item/1005004880464114.html