This physical line servo control uses components that are not currently common. The circuit is from an 80's documentation and is powered by a voltage according to the servo.
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...
The advantages of using Schmitt Inverters (74108) or Schmitt NAND gates (4093) in oscillators lie...
We found this circuit in an American 1980s documentation. The operational ones used are not common...