Abstract: An electronic ignition system for an internal combustion engine having a timing signal source comprising an oscillator for providing a carrier signal; an electronic network connected to the oscillator and including a sensor means for providing a reactance which varies as a function of the rotational position of the engine, the network further including a reference means for comparing the reactance of the sensor means and providing modulation of said carrier signal; a detector for demodulating the modulated carrier signal and providing an output signal indicative of a predetermined rotational position of the engine. The output signal is supplied to switching circuitry for switching the primary of an ignition coil and providing a high voltage output pulse at a time synchronized with said predetermined rotational position of the engine.