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.
This interesting circuit found in a European publication from the 1990s eliminates the voice that...
This simple circuit that interrupts the supply of a 12 V load in the event of an overvoltage was found in...
The radio presented was found in a 1980 documentation. It consists of 3 stages: the tuning circuit...