Not what I was asking about. In your schematic, it *appears* that the cap (reference designators - !) is charged through the resistor for a fixed amount of time, then discharged through the *same* resistor for the *same* period of time. Yet your sim shows that the charge slope is steeper than the discharge slope. Please expand that portion of the schematic for clarity.
BTW, there used to be a television electronics company named Richmond Hill in Richmond Hill. Installed their gear in the 70's.
ak