warning lamp with Euro lights

[mike]

nah...i've got one for trailer indicator lights....two
or three turns closes the reed switch with three bulbs
(car+trailer), doesn't close it with two bulbs (car
alone or car and trailer with blown bulb)

Use the switch to signal trailer bulbs working (legal
requirement in the uk)

Mike

  --- larry C leung <l.leung at juno.com> wrote: > It
would take a heck of a lot of turns...
>
> the Physics Teacher
>
> On Tue, 13 Nov 2001 20:59:59 +0000 (GMT)
> =?iso-8859-1?q?mike?=
> <mikemk40 at yahoo.com> writes:
> >Anybody thought about putting a couple of turns of
> the
> >headlight wire round a reed switch and using that
> as
> >an input to the lamp monitor?
> >
> >mike
> >
> > --- Phil Payne <quattro at isham-research.com> wrote:
> >
> >> Theory: Current would be measured very simply by
> a
> >> coil around the wire -
> >> > the coil wire should have some voltage when
> >> current flows through the
> >> > headlight wire.
> >>
> >> Bad theory.  You will only get a current in your
> >> coil when the current in
> >> the wire _changes_.
> >>
> >> --
> >>   Phil Payne
> >>   http://www.isham-research.com
> >>   +44 7785 302 803
> >>   +49 173 6242039
> >>
> >>
> >
> >__________________________________________________
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