The circuit presented is from 1994 and can be developed with more modern operators. We found the configuration in the National Semiconductor Linear Applications Handbook.
This very high input impedance circuit is suggested by Texas Instruments. The circuit can be...
Found in Unitrode documentation, this oscillator uses some unusual components today such as PU and...
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...