Found in a 1969s American documentation, this circuit uses transistors from that time. The configuration can be adapted to use modern equivalent components.
This circuit is from an American publication from 1974. It, at the same time, limits the intensity of...
When the light that falls on the LDR is cut off, this 1992 circuit activates a relay for a set...
This circuit was found in Mullard's 1960s transistor manual. The circuit uses germanium...