This small source for low consumption projects was found in an old national documentation. The transistor is for general use and the transformer has 50 to 100 mA of secondary current.
This circuit was found in a September 1982 Radio Electronics magazine. It was the type commonly used...
Suggested by General Electric, this circuit with triac is able to reverse the rotation of a motor...
This circuit has been found in operational documentation of the 1970s. The circuit has a fail-safe...