The circuit shown is from a 1994 National Semiconductor documentation and can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
Obtained from a 1980s Signetics documentation, this circuit uses a common integrated circuit at the...
This circuit that can be used as a three-tone domestic bell has a traditional configuration that...
With 3 transistors, we found this receiver in a documentation from 1966. The circuit has an output...