Current modulation

[marioys97]

Hi, I need to control an external device with current modulation from 0 to 85 mA. Is there a way I can control it with a Duet3???

Thanks in advance

[o_lampe]

@marioys97
Closed loop control will be difficult, but a simple PWM signal on a fan output would give you a certain voltage across a resistor in series with your load. That's an unregulated current source, but it's adjustable.

[dc42]

@marioys97 you might want to search for "PWM to 4-20mA converter" and adapt the designs you find for 0-85mA.