This flip-flop controlled by an LDR-type photocell was found in Radio Electroinics magazine from June 1959. Note that it can be powered from the mains and directly controls a sensitive relay.
We find this circuit in a manual of the 80's own used components. The circuit provides an...
This simple guitar distortion effect was found in a documentation from the 90's. The circuit is...
This circuit was obtained from Hands-On Electronics, an American magazine of January 1987. The...