FW: turning a DVM to a ph meter design article

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Acioli, Paulo

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Oct 3, 2009, 7:05:18 PM10/3/09

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__________________________________________________
Paulo Acioli
Associate Professor of Physics
Department of Physics and Astronomy
Northeastern Illinois University
5500 N. St. Louis Avenue
Chicago, IL 60625
Email: p-ac...@neiu.edu
Telephone: 773-442-4733
__________________________________________________

-----Original Message-----
From: Christian Meissner [mailto:C-Mei...@neiu.edu]
Sent: Fri 10/2/2009 10:32 PM
To: Acioli, Paulo
Subject: turning a DVM to a ph meter design article

Hello Dr Acioli,

here is the article i found online on how to build the circuit to transform a digital multi meter into a ph meter. The circuit is pretty simple to build consisting of a couple of operational amplifiers and a couple of resistors and capacitors. Please give it a read when you get a chance, i think you will find it interesting. When you open the pdf file scroll down to the second article.

regards,

Chris