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 circuit was obtained in an Electronics World of 1968. The operational amplifiers ones are...
This circuit trips by shorting the load to quickly blow the fuse when the voltage exceeds a...
This circuit, obtained from ancient English documentation, produces a pulse every 24 hours when a 50...