Quantity   Component name
1 × HW-279 dual 12V relay module
1 × T90RIA120 thyristor module or similar second-hand industrial SCR
1 × Step-up DC-DC CC/CV converter (XY-SJVA-4)
19 × Nichicon UBY 7500uF/35V capacitors (or similar)
1 × USB-C PD 12V trigger module (or barrel jack as cheaper option)
1 × Barrel jack for trigger connector
1 × Trigger button
2 × Copper welding electrodes
2 × AWG10 cables
1 × XT90 connector pair
2 × Cable lugs
1 × DSN-DVM-368 voltmeter
1 × 1 Megaohm logarithmic potentiometer
1 × Thinner cables for low-current connections
1 × Resistors and capacitors for trigger and step-up converter mods