The Simplest Possible pH Meter| Circuit Project

Here’s a schematic diagram for the simplest possible pH meter. Two 9-volt batteries power a high-input-impedance operational amplifier, such as a TL082. The pH probe is connected to the non-inverting input. The output voltage (V out), which is directly proportional to pH, is read with a voltmeter.
The TL082 (or any other operational amplifier with a high impedance input) works as a unity gain buffer between the high impedance of the pH probe and the digital multimeter. [...]
Source: http://testmeasurementcircuit.blogspot.com/2008/07/
simplest-possible-ph-meter.html

This entry was posted on Wednesday, October 28th, 2009 at 7:41 am and is filed under meter.

Circuit diagrams and schematics - Electronic projects

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The Simplest Possible pH Meter