This dimmer for incandescent lamps was obtained from an American 1990s documentation. The circuit accepts triac-like loads that can be virtually any type. Triac must be fitted with a heat sink.
This alarm circuit was found in a 1982 publication. It uses components that can still be found...
This touch switch has a bistable action and powers an LED. The circuit can be changed to control a...
This circuit with only two transistors is from an 80's EDN. It can be implemented with two current...