--- Jinx <joecolquitt@clear.net.nz> wrote:
> =

> As they say in the article, the coil is thousands of fine turns
> on a soft iron core and impractical to wind youself, so it's
> supplied ready-made with the kit. The difference between
> what SC did and a metal detector is that their coil is passive,
> and relies on the disturbance of the Earth's magnetic field
> to cause voltage in the coil. They call it a low-power system
> (70mA, though I can see room for improvement in the circuit)
> but I've no idea how that compares with a typical metal
> detector

Yep, you're right Jinx. :) A metal detector has an oscillator to excite one
coil, usually. I built one a ways back. Turned out ants in central Victoria
have this habit of piling up tiny iron pellets all over their nests .... :(
Debbie



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