This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the PNPN planar key at the time. The circuit has two supply voltages.
This well-designed phase shift oscillator configuration was found in ancient European...
The circuit shown here uses a flip-flop found inside the 4048 to divide the original frequency...
We found this circuit in the November 1952 Radio Electronics magazine. The circuit provides an...