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A coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix. Coils are used in applications where electric currents interact with magnetic fields, in devices such as inductors, electromagnets, transformers, and sensor coils.

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swapping the ground reference on a transformer's secondary winding

Right now, I'm leaning towards using a "wasted spark" automotive ignition coil which has both ends of the secondary winding exposed as such: The logic behind opting for such a coil is that they're plentiful …
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