Digital Salinometer

The completed Salinometer.

The completed Salinometer.

This device was built for a regional science team event using an opamp oscillator circuit with amplitude proportional to the conductivity (which in turn is proportional to the salinity) of a sample of water. The output is rectified and filtered, diode drop hidden by another opamp, to produce a DC voltage that is analyzed by an ICL7107 sample&hold/ADC/Binary to 7 Segment chip.

The design is a derivative of this person’s work.

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