This circuit for incandescent lamps was found in a 70s documentation. The circuit uses an SCR according to the power of the controlled lamps. The delay is a few seconds, given by capacitor C1.
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...
This 75 W power supply was found in American documentation from the 1980s. Transistors can be...
This simple transistor amplifier is from 1982 documentation. The output transistor must be mounted on...