I made a card controlling 24 electromagnets with an Arduino board via 3 darlington ULN2803A
My power supply for the electromagnets was 20 V and 300 mA for each electromagnet.
Due to the physical power of the electromagnets being too weak, I replaced my supply of 20 V by one of 36 V (the electromagnets support 40 V).
When I tried the new 36 V supply, it worked for a minute and then my ULN2803A burned!
However, the ULN2803A documentation indicates that they support 500 mA at 50 V!
Is there a Darlington that supports 36 V and 400 mA per channel, that I could use in place of the ULN2803A?
Or is there another way to control my electromagnets under 36 V?
Sunnyskyguy EE75, You warn me that the Solenoids will dissipate Pd=V²/DCR=36²/67=19W.
Half of my solenoid are under tension about Half a second every 2 seconds. Do you think it will be OK ?