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.
Found in a Popular Electronics of the 90s this configuration can be seen elsewhere on our site....
This circuit consists of a 10 + 10 V symmetrical source that operates from a single 5V input. It is...
This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio...