This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of motors up to about 5 A. It must be equipped with a heat sink.
This control stage or shield can be used with motors from 3 to 12 V and currents up to 3 A....
This circuit turns off after a time given by capacitor C1. This component can have from 1 to 1,000...
This circuit, from the 1977 GE semiconductor manual, uses a unijunction transistor beyond the...