This is a 0-10V DC to AC dimmer. The problem is a big jump when supply from 4V to 5V DC to the input so the output voltage comes from 60V to 130V AC. This is not good, if anyone has any idea how to change it I will be happy. I cannot use the No.5 pin on the 7555 IC, which is used to Soft Start.
Update to clarify:
It is not important what is on the load. It is important to improve the jump from 60 to 130. I provide you only with a brief summary as the whole circuit is complicated and very hard to explain. Theoretical thinking or run circuit simulation will give you wrong value and not give you the solution.
I have two ways first remove Q1, C 10 nF & 100 k second adding op-amp but it means require add small transformer because whole circuit operate on around 5 mA. If add another IC will mean add 12 V transformer or use high wattage resistors it will complicated idea. I expect something not conventional maybe just idea something very simple to improve only.