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.
We found this circuit in the February 1989 issue of Radio Electronics magazine. The selectors are...
This circuit was found in an article about the 555 in the November 1992 Radio Electronics...
This 1992 circuit operates in the range of cordless phones used at the time. The circuit is based...