Obtain flyback transformer with known good HV secondary winding. primary may be left intact if it is known to be in good condition - non shorted. A flyback removed due to failure may be used if it was the primary that failed and the primary turns can be removed without damaging the HV secondary or [...]
The peak output voltage will be approximately 15,000 to 20,000 volts, but this will vary with the ignition coil type and the voltage at which the MOV starts conducting. Do not touch any part of the 555 circuit including any leads of the timing resistors or timing capacitor; doing so can inject interference into the [...]
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 [...]
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