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2015-01-23 00:18  
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This circuit uses a Hall-effect sensor, consisting of an IC that resides in a small gap in a flux-collector torrid, to measure de current in the range of 0 to 40 A. You wrap the current-carrying wire through the toroid; the Hall voltage VH is then linearly proportional to current I. The current drain from VB is less than 30mA.

To monitor an automobile alternator`s output current, for example, connect the car battery between the circuit`s VB terminal and ground, and wrap one turn of wire through the toroid. Or, you could wrap 10 turns-if they fit-to measure 1 A full scale. When I~ 0 V current sensor CS/s VH output equals one-half of its 10 V bias voltage. Because regulators !C1 and IC2 provide a bipolar bias voltage, Vy and VoUT are zero when I is zero; you can then adjust the output gain and offset to scale VoUT at 1 V per 10 A.

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