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A pH Measurement & Control System for the Planted Aquarium

Page 9 - Photos

pH meter/controller prototype

Note that the connection from the pH electrode BNC connector to the input of the amplifier (yellow arrow) on this prototype is very short and direct . The reason for this is that this is an extremely high impedance point, and any extra wire length here will act as a very effective antenna,  picking up any electrical noise in the area. 


Photo of a pH controller built by a reader
When completed, this circuit reportedly worked fine, despite the fact that it was made by an inexperienced builder, on perf board, and with very long leads.

pH meter built on a prototyping breadboard (Click to view full size.)

A pH meter adapted from the circuit described here, enhanced with a microcontroller, analog to digital converter, and additional circuitry. (Click image to view full size.)

More pH-related photos are available at The pH Pages.

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