Malectrics Spot welder box

Apologies if this explanation is a bit random ...last thing at night ....

Large box for the spot welder as I did not like my board hanging off the battery

You need to remove the original pot and fit an external pot and also move the display to the lid.

The pot I used was a 2W Wire Wound multi turn 50kOhm. When removing the original pot..note the wiring, it is not as expected..the pot wiper IS not the centre pin on the original PCB mounted pot.

There is a low frame inside to support 3x 18650 cells. I used a 9 pin DIN socket for the balance wires for the 18650 cells, so pack balance and charging can be done without opening the box.

Switch is a 2 pole 6 way rotary. I used one pole for power and one pole for selection Auto Pulse or not.



Hex holes in the base are 8mm across the flats.

TVS diode fitted below the board...clamped and soldered to ring terminals then heat shrieked to prevent shorting to the base of the board.

Shoktty Diode tabs need drilling to