The transistorized ignition system consists of a distributor with a magnetic sensor, an electronic module and an ignition coil.
Like the classic distributor, the contactless distributor has centrifugal and vacuum regulators (rarefaction causes the node to move "ledge magnet disc").
The electronic module is attached to the body with 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 conditioning circuit, a constant energy calculator, a Darlington transistor output amplifier, and a timing element.
An ignition coil specially matched to the system is mounted on the exhaust manifold.
Job
The magnetic part of the distributor, called the pulse generator, consists of a ring magnet fixed with four rivets on a disc with four lugs (one per cylinder), and from the inductor.
Another disc with four lugs is attached to the distributor shaft.
The magnetic flux in the region of the coil changes as a function of the movement of the protrusions of the rotating disk relative to the protrusions of the fixed disk. The change in magnetic flux excites an electromotive force in the inductor. 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 protrusions are opposite each other.
The module calculator recalculates the distributor rotation speed, battery voltage and coil impedance in such a way that the energy output is constant at each moment of 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.