Driving multiple electromagnets

[johnerrington]

@johnwasser

I think the ULN2803A will work without any additional parts.

At 250mA Vces is 1.2V; if all 5 electromagnets are on you have 1.2V * (5*0.25A) = 1.5W
that is pushing the power dissipation for the chip.
You could glue on a small heat sink.