This circuit was found in an American publication in 1966. The circuit uses a general-purpose FET that admits an equivalent. The instrument is a 250 uA full-scale microammeter.
This circuit takes advantage of the temperature variation of the component with the air flow that...
Using a small speaker as a microphone, this 10-LED circuit was found in the March 1992 issue of...
This circuit is a four-quadrant multiplier using an LM3900. The circuit was found in the July 1988...