This circuit was obtained in a documentation from the 70s. The operational amplifiers used are uncommon today. Modern equivalent types can be tried out.
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...