Car Transistor Ignition

This transistor ignition circuit give your car to have better starting and smoother running, particularly at very high and very low RPM. Lower fuel consumption, less pollution, lower servicing costs. Drive economically, drive electronically. Only for petrol/gasoline engines. This circuit will reduce breaker point wear and provide cleaner spark.

Circuit diagram:

Transistor Ignition circuit diagram

Wiring diagram with the vehicles:

Transistor Ignition wiring diagram

Circuit Notes:
This circuit used for cars with negative ground 12V negative ground system, maximum ignition current of 4A and maximum switching speed 500KHz. Motorcycles, mowers, boats, etc can also use this circuit.

For 6V Negative ground system, change the following resistors:

  • R1, R2: 150 ohm / 1W
  • R3 : 68 ohm / 1/4W
  • R4 : 100 ohm / 1/4W
  • R5, R6, R7: 68 ohm / 1W

Car Transistor Ignition Specifications :

  • Completely shockproof
  • Practically test on 2-4-6-8 cylinder engines during a total amount of 2.500.000 km.
  • Principle: transistorized ignition
  • Connection element: Darlington transistor, triple diffused
  • Connection current: 4 A
  • Connection speed : Up to 500 KHz
  • Typical firing period : 2.000 u second

The kit of electronic transistor ignition is available at electronic online store. Download the manual transistor ignition kit manual from the following link:

Incoming Search: sketch of transistor ignition circuit

2 thoughts on “Car Transistor Ignition

  1. Dave Krivan

    As with the above inquiry; can this be modified to work on a positive ground
    twin motorcycle, and would I have to parallel the coil primaries, and have the wasted
    spark on the non compression cylinder.

  2. j n shaver

    can this circuit be modified to work on positive ground engines thank you?

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