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How to make an ignition coil driver5/2/2023 Like other transformers, it consists, in part, of two coils of wire, as shown in the diagram at right. This ignition coil is a pulse-type transformer. The key principle that makes transformers work is electromagnetic induction: A moving magnetic field, or a change in a stationary magnetic field (the case in our ignition coil), can induce a current in a wire exposed to that field. ![]() Transformers transfer voltage from one circuit to another, either as a higher voltage (as in a step-up transformer, of which the ignition coil is an example), or a lower voltage (a step-down transformer). The heart of this system is a device called an ignition coil. The vehicle’s ignition system is designed so that a 12-volt battery can generate the very high voltage required to create such a discharge. For combustion to take place, a spark is needed to ignite the fuel mixture in the engine. Electric, solar-powered and alternate fuel vehicles may be the wave of the future, but for now most automobiles run on gasoline, which they burn in an internal combustion engine to convert into motion.
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