On 08/09/2011 00:02, jim@jpes.com wrote:
>=20
>  Another thought.  Put a few turns of fine wire around the current
> carrying conductor, and feed it to the
>  input of an opamp (or comparator).  Feed the output of the opamp into
> the trigger input of a one shot set
>  for 100ms or so.   Then you'll be able to see the pulse because the
> oneshot is acting as a pulse stretcher.

This is exactly how the circuit in question works I believe (still
trying to get a schematic).  I've got a few comparators on order so I'll
try this when they arrive.

Many thanks,

David

--=20
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