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Subject: Hall effect compass
Posted by: Mat Lawrence
E-mail: cgl(at)globalnet(dot)co(dot)uk(no spam)
I am trying to produce a digital compass using Hall effect IC's.
I have an Allegro (from Maplin.co.uk) IC (can get the part no.)
The difference between N and S (my objective), is about 1mV IIRC.
I need to amplify this to 2V or more for use in logic circuits.
I have tried some 081's in series, it does the trick but is unstable, the
N-S voltage difference gets smaller with time.
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