This circuit was found in a 1965 General Electric documentation. It is intended for reception of the aviation strip, but inside an aircraft or nearby (which is now prohibited).
This unusual circuit from a Popular Electronics of the 90s uses LED indicators, operating as a...
This circuit was found in a 90s Electronic Engineering. The quadruple operational amplifier can be...
I got this circuit from a magazine in 1967. The magazine no longer exists, but the circuit that...