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Date:         Tue, 8 Jul 2014 16:49:15 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Westy water tank level indicator problem
Comments: cc: Richard A Jones <jones@colorado.edu>
Content-Type: text/plain; charset="us-ascii"; format=flowed

Oops, forgot the link: http://pws.prserv.net/synergy/Vanagon/LEDpanel.htm

At 10:00 AM 7/8/2014, Richard A Jones wrote: >Any ideas or experience or knowledge? David? ;-) > >Richard

Quick answer, more later.

1) You can test the input with a potentiometer and voltmeter. Input lead is biased to B+ with one megohm, electrodes ground out successive resistors in a voltage divider inside the little black module by the tank. Result compared against similar network at the left-side LM324 chip.

2) The LM324 chips die a lot.

3) Some info and schematics here

Gotta go, back later.

d

-- David Beierl -- dbeierl@attglobal.net


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