> > A switch-mode regulator at that power will be a smaller IC
> > (probably in a regular surface-mount package) and power transistor,
> > with a capacitor and inductor (enamelled copper wire wrapped
> > around a little ferrite core) nearby. Switch-modes are _much_
> > more efficient, so there's no need for a heatsink to dissipate
> > waste power.
>> Hmm, that sounds like the ceramic rings Kate described. Any way to
> tell by looking at it how many amps it might be rated for?
Generally, no. It depends on the ratings and specs of
each component and the frequency they are switching at.
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