Now i'm a bit confused.
The power supplies are too weak, but they seem to work just fine.
We tested this quite a while with those power-supplies and no obvious problems.
Could it be that the magnets, carrying no weight (they are just used as bolts) consume less power, than stated on the datasheet?
The magnets are just switched on for a short time, btw.
An, yes switching should be as fast as possible, but as it's not a fully automatic weaving machine,
everything within a 2 second range would be fine.
It's the 7W type btw. It's bit confusing as the series has different kinds, looking all the same.
If the ULN2803 isn't suitable for switching such a current, i could try to get those FETs.
But in the german consumer online shops i wasn't able to find them.
And my local electronics store guy, whom i paid a visit today, didn't find this thing in his lists either (he said it might be too new?)
I'm afraid i know a bit to less about electronics to solve this.
But i really don't know how to put a 100R resistor in a gate...
Beeing a bit stuck here, my next attempt would have been to get as many ULN2803s as i have power supplies
so that i would be able to at least connect the things.
Assuming that will be too much current, what could happen in the worst case?
I'm willing to risk losing some ULN2803s, but dont want to burn the arduino board.
thanks for your help