> How feasible would it be to construct such a torroid? Or modify one
> already existing. In the project that Tony posted, they seem to have
> used a snap on choke. This seems to be a nice arrangement as it's
> already split in two and can be snapped around the wire. However, 4/0
> cable is rather thick (0.46inch), and I don't know about finding a snap
> on choke that large.

A snap on "choke" is such a toroid when it's snapped on.  A common consumer
use for this kind of thing is the pickup of an engine timing light.  I've
seen AC amp meters with a similar but bigger type of fixture.


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