A place where I work, have just got some 12V 5ohm solenoids, the problem is that I only can give about 700mA (and the PSU only 1A , and max 190% for a short time), so I can't just use a bigger transistor.
It should have been 24 ohm as I had for test.
Just a serial resistor don't work. ( need more start torque)
I just checked: a 4700uF cap at 12V can open the solenoid
When first open I only need about 100mA to hold it.
All the extra has to be placed outside the PCB.( after my 700mA output)
Any smart way to do that ?