Lucas magnetic sensor

[am018]

Lucas have used both Hall effect and coil pick-ups  -- I know  the changeover to
Hall Effect on Chrysler UK vehicles was  in 1979/80.

Stowe, Ted-SEA wrote:

> Hi, I need a bit of help this morning.
>
> I have a Lucas distributor with what I thought was a hall effect sensor, but
> it appears that it is a coil with a center tap, (3 leads).
>
> I need to trigger a gm ignition module with this, so I imagine I need some
> type of buffer for this. I have no idea if hall sensors were edge triggered
> or not, or if this Lucas sensor is or not. I suppose I could just have a
> simple pull-up to a stabilized voltage source of ? and generate a pulse. I
> also have a Lucas optical sensor if that would make a difference, but I
> don't think so. has anyone ever done this or does anyone have any good ideas
> ?
>
> thanks, Ted Stowe
>
> -----Original Message-----
> From: Albert Grippo [mailto:grippo at jlab.org]
> Sent: Wednesday, November 11, 1998 4:57 AM
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: ? on Mr Hall Effect
>
>   The Hall sensor I am using has 3 pins: VDD(+5 or +9 V), OUT,
>   and GND. I connected a 5K pullup resistor between VDD and OUT,
>   and a .1 uF decoupling cap beteween VDD and GND. To use it
>   I glued a ceramic button magnet to a distributor, mounted
>   the Hall sensor over the magnet, and put a slotted steel wheel
>   in between the two.  When the solid part of the wheel is
>   over the magnet, it shields the field from the sensor and
>   you read VDD volts on the OUT pin.  When the wheel is
>   turned so the slot exposes the magnet, you read 0 volts. It
>   is not sensitive to motion, just to whether the magnetic field
>   is exposed or shielded. I am using it to determine the no. 1
>   cylinder. One last thing, the magnet south pole goes toward
>   the sensor.
>
>                   -Al Grippo