I like that idea but the GMT won't let me do that.
I know electronics are out of the question but a capacitor could be something as simple as two metal plates separated by a sheet of glass or ceramic. They would just store electricity like a battery. Harry doesn't blow out transformers when he walk through the city cause they aren't complicated. Transformers have one coil of wire on one side and another coil with twice the amount of windings. Voltage fed through the small coil induces a current in the bigger coil and increases the amount coming out. If the ratio is 1 to 2 the voltage is doubled. That's a step-up transformer. Reversed it becomes a step-down transformer.