warning lamp with Euro lights

[Larry C Leung]

Hmm, must be more sensitive devices (or more current) than any of the
isntruments that I have access to in the High School lab (never spent
series time in the EE department in college.

LL - NY

On Sat, 17 Nov 2001 17:30:28 +0000 (GMT) =?iso-8859-1?q?mike?=
<mikemk40 at yahoo.com> writes:
>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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