Doctor Z

[Tron1]

When you design the vest make sure it's tested right

 

[Doc 05]

Is there a power source?

From the schematics I've seen, it's optional.
If your added power the positive would typically flow through the witness plate
and negative (ground) on the potentiometer ground. But you may have to add
diodes to the circuit. (I'm still learning)

 

[TimeFlipper]

Is there a power source?

No its passive..