This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
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...