This Motorola circuit is from 1965. Collector currents must be 7 and 12 A for transistors. Equivalents may be used. The circuit is for contact breaker cars.
Found in the American 73 magazine for radio amateurs, this circuit can test common quartz...
This circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid...
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...