? on Mr Hall Effect

[Bruce Plecan]

-----Original Message-----
From: Albert Grippo <grippo at jlab.org>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Cc: diy_efi at esl.eng.ohio-state.edu <diy_efi at esl.eng.ohio-state.edu>
Date: Tuesday, November 10, 1998 12:33 PM
Subject: Re: ? on Mr Hall Effect


Please do post it.  It got really serious when Doc put money on a
bet about this a hour ago.
Bruce
(weeks wages around here, 18 cents US)
>
> I had the same problem - it has to do with the sensor being open
> drain. You have to put a resistor and possibly a cap in the circuit.
> When you do this, your DVM will stay at +9 while the tooth is far
> from the sensor, then drop to 0 when you bring it near.  I have
> the circuit at home and can post it tomorrow - it is very simple.
> -Al Grippo