We found this circuit in the November 1992 Radio Electronics magazine. The circuit uses an LDR as a sensor and the transistor can be any general-purpose transistor.
This circuit can gerenate square signals and be comanded by na external control. When the input...
This circuit is from an American 1967 documentation and can be implemented with modern equivalent...
This circuit was found in 1968 General Electric documentation. The circuit uses components from the era...