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Ignition Coil Driver

2015-02-28 17:07  
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Ignition Coil Driver
This design uses a 555 timer and three 2n3055 switching transistors to provide a variable frequency, variable voltage input to an automotive ignition coil. Normal output is 25kV when run at 12v input and at the coil's resonant frequency (8kHz). Increasing the voltage output to about 50kV is possible if the input voltage is increased to 34v, however this risks burning out the switching transistors when the system is operated for an extended time. Electrical Diagram: Capacitors: rated at 50v Resistors: 1/2w, 5% tolerance Output frequency to the coil is controlled by VR1, output voltage is controlled by VR2. V+ is connected to pin 3 on the 5v regulator.