This circuit provides a logic output signal when the voltage exceeds a certain value. The circuit is from the 1994 Linear Applications Handbook by National Semiconductor.
The purpose of this circuit, found in a documentation for radio amateurs in 1974, is to amplify noise...
This circuit was obtained in an old American documentation. The integrated circuit used is...
This is a Japanese commercial radio from the 60s. The circuit is listened to by phone and is...