The RPM seem to be stable JUST when the PWM signal is at 5V, no less.
- Configured as 0-5V and 24000rpm seemed stable, but I was not sure at first.
- Configured as 0-10V and 12000rpm was stable.
That’s why I thought a PWM to analog signal converter could fix it, I don’t have much knowledge in electronics but I guess that the PWM signal when it is set at the maximum has less or none fluctuation, I could be wrong.
I don’t know if I mentioned that I have checked the PWM voltage many times and it was always spot on, no variations.