Hi, I have a bare proportional solenoid flow valve PV21-06
I would like to control from my arduino nano. With my laboratory power supply the air flow increases more or less linear to the voltage put on the valve.
I try to reach same with a IRF520 module:
I connect it with the solenoid and a 24V/2A DC source and try to control the output voltage via PWM.
Unfortunately the voltage increases hardly until I reach about 4 volts (PW: Frequency 2000, width:50). From then the output voltage increase exponentially until I reach the full 24V at PWM width 100.
I cant read the IRF520 datasheet, so I dont know if this behaviour is absolutely normal.
Is there a reasonable way achieving a control of the external 24V DC supply?