warning lamp with Euro lights

[larry C leung]

Late entry into this thread, been WAY too busy.....

As Scott, Bob and Phil have stated,

You can't get cascading electric/magnetic fields without a change in
current. DC current has a constant E-field and B-Field. Transformers only
work with AC current. Otherwise they're just big magnets.

However, you MAY be able to get the hall sender to just sense the
presence of the magnetic field, though my experience says that they are
better at sensing changing magnetic fields (think bicycle speedometers
and electronic tachs). If it can just sense a weak magnetic field, then a
hall sensor may be able to be used to fool autocheck if you use the hall
sensor to fire another auxiliary circuit through a resistor that would
feed directly into the autocheck circuit through the original bulb
wiring. Not sure if it's worth all of the trouble.


the Physics Teacher

On Tue, 13 Nov 2001 12:18:57 "scott miller" <macatawa at hotmail.com>
writes:
>>Bad theory.   You will only get a current in your coil when the
>current >in
>>the wire _changes_.
>>
>
>Really?  I thought that was how transformers worked - cascading
>magnetic
>fields driving electrons in parallel wires as the powered wires
>change
>current (AC).  Doesn't the steady magnetic field circling a steady
>flow of
>electrons in a wire (DC), drive electron flow in a circle of wire
>around the
>first wire?  Guess I'll have to get out the books.
>
>Scott
>still not an EE
>
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