TRANSISTORIZED IGNITION

All new cars have ignition systems https://www.saimacpower.com/gx35-engine-coil-product/ in which the breaker points and condenser are eliminated by transistorized circuitry, and if you want, you can buy some mowers and blowers with this feature. It’s really an unnecessary expense for the homeowner, for the additional cost of transistorized circuits cannot be justified on equipment used so relatively little. It can barely be cost-effective in an automobile, and the major reason for its use in cars is to maintain low exhaust emissions.The transistorized design used in mowers and blowers still is a form of magneto ignition. A typical design, shown in l-16, is by Tecumseh. Here the permanent magnets remain in the flywheel, and a trigger coil and input coil are positioned just a few thousandths of an inch away on the engine block. The conventional coil with its two windings and its wire to the spark phlg is renamed a pulse transformer and is spliced into a circuit between the input and trigger coils.As the flywheel spins, it passes the input coil, a thick-wire winding that converts the magnetism into a low-voltage alternating current. The current passes through a rectifier, a one-way solid-state device that converts the AC to DC, which then passes into ’ condenser for storage. As the illustration shows, there is a rectifier on ea%
,i(l”,c\ rur:) wire to’the condenser. The second rectifier can be open or closed, but at this time it’s closed, preventing current from getting out of the condenser.In electronic circuitry, the condenser is called a capacitor, and the system is therefore called a capacitivedischarge design, for the spark will occur at the plug shortly after the capacitor discharges the current it is storing. But we’re a bit ahead of ourselves. After the flywheel passes the input coil to charge the capacitor, it reaches the trigger coil, in which its magnetism induces a small amount of current which closes another rectifier that serves as a solid-state switch.
When this rectifier closes, the capacitor can discharge, and discharge it does into the pulse transformer’s thick-wire winding. The flywheel magnet is now past the trigger coil, so current to the second rectifier is shut off, making it automatically pop open. This is equivalent to the opening of breaker points, and the circuit in the thick-wire winding collapses on the pulse transformer’s thin-wire winding, resulting in stepped up voltage, which is discharged to the spark plug.https://www.saimacpower.com/g45-engine-magneto-stator-product/