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Date:         Thu, 29 May 2008 13:13:10 -0700
Reply-To:     David Kao <dtkao0205@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Kao <dtkao0205@YAHOO.COM>
Subject:      Re: Hall Effect Sender? Speedo question
In-Reply-To:  <483F037B.6010707@pobox.com>
Content-Type: text/plain; charset=iso-8859-1

Every water cooled Vanagon has a Hall Effect sender. My 83.5 and 84 have it. If you need a signal from the Hall Effect sender for the purposes of driving a RPM gauge you can take the signal at the terminal 15 of the ignition coil. You can isolate it with a 0.1 or 0.01 uf 250V capacitor put in serial to the line to the RPM gauge. The capacitor will block DC off but pass the pulses through for the RPM gauge. You may need to experiment with the capacitor to see if the capacitance is too low. My guess is anywhere between 0.1 and 0.01 uf will work fine. The capacitor may not be needed at all if the RPM gauge has a signal conditioning circuit to deal with the DC component in the signal coming from the terminal 15.

David

--- Dan Barrett <dbx@POBOX.COM> wrote:

> Mark, > Re. where to find a hall effect sender: without my Bentley close to > hand, I seem to recall that the distributor on post-86 buses has a hall > effect sender on it. > > Best, > d. > 1990 GL -- "Mudskipper" >


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