This circuit that can be activated by light or heat was found in an old American documentation, but the components it uses are perfectly current. The power transistor shall be fitted with a heat sink.
We found this circuit in an American 80's documentation. The circuit can be adapted to function as a...
Found in a 1964 Electronic Design, this circuit makes use of FETs of the time. These transistors can...
We found this circuit at Modern Electronics in January 1991. The magazine no longer exists, but...