On Wed, 2005-12-14 at 19:46 +0200, John Ward wrote:
> hi, the method i've used previously is the current loop/transformer method.

OK, I admit that I've never heard of that and I don't quite understand
it.. Google isn't helping me much on it either.. Can you elaborate?


> You only need around 25mA for driving a burden resistor which can then be
> monitored by a pic a/d port.

Have you seen this method documented anywhere on the Internet? It sounds
interesting and I'd like to know more..


> The trafo will be quite small, in the region of say 1cm^2

Small is good...


> This also makes it electrically isolated.

Excellent.

Cheers,

Tim

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