This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...
This circuit was taken from Popular Electronics from May 1968. The circuit is sensitive with...
This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular...