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 water level control circuit was found in a 1980s documentation. The circuit uses a capacity...
This circuit was obtained in an English publication from 1980 but can still be assembled with...
This circuit is from an American cookbook from 1977. The circuit generates a voltage of...