Hi all,

as part of a project I need to energise an electromagnet to
repel a permanent magnet. The pulse will be fairly short,
probably a few 10's of milliseconds, at a rate of about 0.5Hz

The electromagnet is 200 turns of 0.7mm enamelled copper
wire on a 7mm soft iron rod. DC inductance is 65uH. To
energise it I'd have the coil as the high-side load for a FET
or BJT (eg power Darlington, TIP12x) driven by a PIC

Need to make a decision re PSU and reservoir caps to use

Would I be right in thinking that a higher voltage would be
better for the switching component and the PSU because the
amperage will be less for the same pulse wattage or is the
inductance going to play some part in this ?

TIA

Joe
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