This linear oscillator was found in a 1968 publication. The operational amplifier is from that time. Both the FET and the integrated support current equivalents.
We found this circuit in a European publication from the 1970s. The transistors are made of...
The TAA131 used in this circuit is not very easy to find today, but an equivalent low power audio...
This circuit was suggested by National Semiconductor in its Linear Application Handbook. The...