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pH Measurement & Control Schematic posted

	I have posted the schematic diagram for an aquarium pH measurement and
control system (along with extensive notes) at

	The system was designed to be as simple and easy to build as possible. 
All of the parts required (with the exception of the probe) are
available at any Radio Shack store.  The probe is available for $33 from
Pet Warehouse.
-- Sherman Lovell