The circuit shown is from National Semiconductor's Linear Applications Handbook. It makes use of the LM78S40 which is not an easy component to obtain today.
This small signal injector generator was found in the February 1971 issue of Radio Electronics magazine....
This circuit that generates signals between 1.5 and 2 kHz was found in a documentation from the...
Other operational Amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...