Hall current monitor (CB7384E)

Found in an EDN from the 90's this circuit makes use of unusual components today.

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Small Inverter (CB11943E)
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2 to 24 kHz Low Pass Filter 741 (CB16756E)
We found this filter configuration in an old documentation. It is one of many possible ones that...
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This circuit measures the conductivity of a saline solution, which is affected by the electrolysis effect....