Ignition coil as a generator
My EHT3 project uses a solid-state oscillator and ignition coil to generate a very high a.c. voltage (using a spark gap as a guide suggests ~40kV). The project uses two d.c. supplies: one for the oscillator part and one to supply the power to the coil. This makes the circuit a bit more complex than most but prevents the ignition coil supply from upsetting the operation of the oscillator. Click on the circuit diagram below if you would like a detailed description of the design.
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