This simple audio generator with the 741 was found in a 90sTexas Instruments. The circuit generates sinusoidal signals from 15 Hz to 150 kHz in 4 bands, as shown in the diagram.
This circuit appears in similar versions elsewhere on this site. The transformer is 110 V or 220 V...
This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit...
The XR2206 is not a common component today, but if you have one you can build this function...