> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Spehro Pefhany
> Sent: 10 September 2009 21:36
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] two wire inductive magnetic gear tooth sensor
circuitry
> 
> 
> Bob-- maybe he had the sensor in series with the 24V supply and was
> reading
> the voltage wrt ground, which would yield the results he observed. If
he
> said clearly otherwise, I must have missed it.

That's the impression I got, though why you'd expect the 24v supply to
do anything under those circumstances (other than add an offset to the
output) is not clear.

If it is a variable reluctance sensor then there are automotive IC's
specifically designed to handle the signal processing of these so you
get a nice clean pulse at the zero crossing point e.g. LM1815 and
MAX992x

Regards

Mike

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