Another of the many similar configurations we have in this section. This one is from a Radio Electronics magazine from June 1985. The transistor is according to the power of the controlled motor.
This circuit was found in Italian magazine (1988), but can be mounted with ease even with the...
In the figure we have a simple shield of 1 transistor. The supply voltage depends on the relay. The...
The operational 714 (not the 741) is an old Raytheon type that is no longer common today. The...