Equivalent operational amplifiers can be used on this crystal-controlled oscillator. The circuit is from old documentation and can be changed to operate on other frequencies.
This circuit is from a 1982 documentation. It can be modernized using LEDs in series with 470 ohms...
We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps....
This circuit appears with variations in other points of this section. This version is from...