This circuit was found in the November 1966 issue of Electronics Now magazine. It uses an LDR as a sensor and has a Bargraph scale with the well-known LM3914.
This biestable circuit was found in a Popular Electronics from the 90s. The circuit has an unusual...
This 3-step circuit for generating digital signals was found in the November 1976 issue of Radio...
This circuit for low frequency signals from the Loran guidance system was discovered in the July...