High Voltage from an Ignition Coil


Posted on Oct 16, 2012

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 circuit.



If the metal oxide varistor heats up significantly, increase the switching frequency (lower timing resistance) until the output voltage decreases slightly. If the MOV still gets hot, try placing a capacitor across the mosfet as suggested above. If this do




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