12 volt 3 amp transformer or
500ma and up Wall wort charger.
Spot welder for li-ion batteries and thin metal.
The capacitors have a charge level indicator LED.
Delay is created by the 100 mf cap on the gate.
The size of the caps have to match the time
And amps required to weld the metal.
Personally, I use a few 1F super caps for mine.
A small cheeper transformer will charge the caps
The caps do the welding current.
You can use a Wall wort charger but include
1M ohm bleeding resistor for the cap bank when not used.
If using lipo battery in place of capacitors be sure to include a low voltage cut off to not over drain the batteries and ruin the milliamp hour rating.
