This circuit is from an old documentation, making use of an operational of the time. The circuit can be adapted to use modern components. The power supply must be symmetrical.
Found in American documentation from the 1980s, this circuit is a basic signal rejection filter...
This circuit is from a Radio Electronics magazine from February 1992. The circuit has the effect...
This "debouncer" was found in Popular Electronics, using TTL technology. For this reason, it can be...