I'm trying to build a Linear bench PSU, Here's what I did so far:
So I'm converting the PWM to voltage using a low pass filter and opamp, but the mosfet gate threshold is 1V that means I can't have precise control over the output voltage. I did tried to increase the opamp gain but again it's not accurate at all.
How can I control the output voltage only with Arduino PWM (digitally)?
Without using a potentiometer to change opamp gain.
This question is not a duplicate, because in other questions they didn't specify that their output is controlled digitally.