I have a custom made solenoid that is required to work at 60V to actuate with enough force.
I have tried two circuits shown in the figure below but both don't work. In the first circuit, the voltage across the coils is just 3V whereas in the second one, the voltage across the coil is zero although the opto isolator does work.
I can't figure out what is going wrong. I used IRFZ44N for mosfets at 30V source-drain voltage for testing.