This contact or reed switch actuation was found in a 1964 Electronic Design. The circuit can be used with sensors and the triac is load dependent.
This circuit is from an old publication from the 1950s. The circuit uses germanium transistors but can be...
Unlike the previous circuit, the output of this one goes high in the window voltage range. The...
This 1998 circuit controls the volume in a stereo system by touching switches. The circuit is for...