The PWM to 0-10V conversion circuit I posted and removed does not work
the low-pass filter cap discharges (very/too) quickly
I need to change R1 to say 10k and R2 to 20K so that the resistors work.
Every time you add an op amp onto the output, you in effect double the pwm voltage that can be controlled.
would then be able to control 0-20v with pwm?