Found in an Electronic Design from the 90s, this circuit provides outputs according to the input following the truth table given next to the diagram. The various options are shown.
This circuit generates sinusoidal signals between 300 and 3000 Hz. We find a 303 Circuits from the 90's....
This amplifier for audio transmission lines was found in a 1961 American publication. The critical...
Old phones with dials can be used in a simple home intercom system, as this circuit from Popular...