This circuit was found in Raytheon's 1967 documentation. The circuit uses an operating of the era, but the configuration can be applied to modern operational amplifiers.
This circuit generates a linear sawtooth signal. The circuit was found in the December 1992 issue...
When the power is on, the 1 µF capacitor charges slowly by R1 and P1 until then on trigger...
This is a possible circuit for the receiver of the previous circuit. Other circuits can be found...