Abstract: An ignition system which is responsive to timing signals generated in timed relationship to the operation of an internal combustion engine for providing firing spark to operate the engine. The system uses two capacitors to provide an adaptive dwell system wherein the percent of time that ignition coil current is limited at a fixed magnitude is made variable with respect to the engine rpm.

Abstract: A driver circuit is coupled to the stator windings of a brushless three phase DC motor which is responsive to the open circuit back EMF voltage induced in the next stator winding to be energized as a permanent magnet rotor of the motor is caused to be rotated for producing phase current drive to the stator winding in synchronous with the operation of the motor. The driver circuit includes an increment drive circuit for supplying periodic switching command signals in succession to a switching circuit to produce phase current drive in each stator. The increment drive circuit increments a switch command signal to cause phase current through the next phase stator winding in reference to the magnitude of the EMF voltage induced across said phase stator winding falling below a reference level.

Abstract: The self-protecting load driver circuit includes an output transistor having an emitter coupled to a current sensor and a collector adapted to be coupled to the electrical load. A comparator senses the magnitude of a current sensor signal and applies trigger signals to a time delay circuit which is connected between the output of the comparator and the control terminal of a control circuit for the protected transistor. The rise time of the voltage across the current sensor depends on the inductance, for instance, of the load. The time delay circuit enables the control circuit to disable the output transistor for a predetermined time duration in response to the threshold voltage of the comparator being exceeded by the sensor voltage. At other times, the protected transistor is saturated by the control circuit so that power is delivered to the load.