This circuit is from 1964 documentation but can be easily implemented based on current components. Input waveforms and detection are shown next to the diagram.
This low impedance circuit was found in an Electronic Design from the 90's. Operational amplifiers admit...
This circuit makes use of an old operational one to generate clock signals that depend on the...
This basic version of the timer with the 555 was found in documentation from the 1980s. The relay...