Though the demonstration used a 9V battery, the guide also mentions using 30V and above for faster removal and DC power supplies. iFixit did so using its portable FixHub Power Station. Since the ...
D’Addario has launched the XPND Pedal Power Battery Kit ... not to mention consistent – 9V power a reality. The kit has everything you need to supply outboard power to your pedalboard.
The ignition coil comes from a three wheeler, the primary power supply is a ATX supply from a computer and the oscillator is powered by a 9V battery. We do wonder whose vehicle stopped working though.