The transistor ignition system consists of a distributor with a magnetic sensor, an electronic module and an ignition coil.
Like a classic distributor, a contactless distributor has a centrifugal and vacuum regulator (vacuum causes movement of the "magnet-disk with protrusions" unit).
The electronic module is attached to the body using an aluminum plate that provides heat dissipation. The function of the module is to convert the signal from the pulse generator into a control signal. The module has a distributor signal generation circuit, a constant energy calculator, an output amplifier with a Darlington transistor, and a time element.
The ignition coil, specially selected for the system, is fixed to the exhaust manifold.
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The magnetic part of the distributor, called the pulse generator, consists of a ring magnet fixed with four rivets on a disk with four protrusions (one per cylinder), and from the induction coil.
Another disc with four protrusions is fixed on the distributor shaft.
The magnetic flux in the coil area changes as a function of the displacement of the projections of the rotating disk relative to the projections of the stationary disk. The change in magnetic flux excites an electromotive force in the induction coil. This force has a maximum value at the moment when the magnetic flux decreases with the greatest speed and when it suddenly changes direction, i.e. when the projections are opposite each other.
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The module calculator recalculates the distributor rotation speed, battery voltage and coil impedance so that the output energy value is constant at each moment in time.
When the distributor generator no longer emits additional pulses, the amplifier transistor is blocked and cuts off the current in the primary winding of the coil.