The circuit for this PCB is a bit different from the segment PCB and this below is the schematic. This PCB has two stages and we have the same power control part as for the segment PCB, but the Thyristor is activated with a push button instead of the phototransistor. This PCB also has the input of 450V and 12V from the battery pack. We only need one of this PCB and any amount of the segment PCBs.