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.
This simple circuit indicates when the two channels of stereo equipment are balanced. The diodes can...
Found in an 1989 R-E Experimenters Handbook, this circuit produces several sound effects that can...
September 2017 - This new integrated circuit, which facilitates the design of PWM dimmers, can now be...