I am building a very simple magnetic pulse circuit, which sends a short
(1uS) pulse through a coil wrapped round a solid core (using a FET).
This is a near exact copy of a circuit I was given which needed some repair=
..

What I don't have is the coil & detector circuit which picked up these
pulses, or a schematic.  I know that it is some form of loop (embedded
in tarmac) which feeds into a comparator and then a monostable.  Max
distance for picking up the pulses from the transmitter is only a few
inches.

I'm stuck with the loop part.  All I need is something to verify whether
my pulse circuit is working.  As my google fu is failing me (though it
does find lots about traffic signals), can anybody suggest how the loop
should work?

>From the small amounts I've found I think I should be able to do it with
a square "loop" of stranded wire and a resistor and expect a small
voltage out.  However I can't find anything more practical than this.

David
--=20
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