Found in a 1967 Ferranti documentation, this circuit uses a LDR from that time as a sensor. Transistors can be replaced with modern equivalents.
This circuit was found in an old American publication. The transformer is the type of output found...
This current source circuit with the CA3130 was found in a 1977 publication. The circuit provides...
The project presented consists of a flasher alternated with relay, which can be installed at the...