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.
This circuit was found in the January 1980 issue of Radio Electronics magazine. It is a digital slot...
This circuit was found in a 1990 Electronics Handbook. The transistors can also be the BC548 and...
This amplifier circuit is from a 1952 documentation. The frequency of the amplifier signal depends on...