This simple power supply circuit triggers when the light on the LDR reaches the level set on the potentiometer. The circuit is from an Electronics Now from July 1995.
This circuit was found in a 1964 Electronic Design. The transistors are of the time, but can be...
Suggested by General Electric in 1980s documentation, this circuit makes use of PUTs that are not...
This electronic Morse key was found in a Popular Electronics from the 90's. The components are common,...