This circuit was obtained from an Analog Devices documentation from the 90's. The circuit is for a voltage of 1.23 V and is used in a voltage source greater than 3 V.
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...