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1. An open-loop electrical current transducer for measuring an electrical current flowing in a primary conductor, comprising a magnetic circuit core with an air-gap, and a magnetic field sensing device comprising a circuit board, a first magnetic field detector in the form of an ASIC mounted on the circuit board, and a second magnetic field detector in the form of a conductive pick-up coil formed on two or more layers in or on the circuit board beneath the ASIC and in overlapping relationship therewith, the ASIC and pick-up coil positioned in said air-gap, the outputs of the first and second magnetic field detectors connected to a signal processing circuit generating an output signal representative of said electrical current, the output of the ASIC representing a low frequency (LF) channel and the output of the pick-up coil representing a high frequency (HF) channel, wherein the signal processing circuit comprises an adding circuit configured to sum a signal output by the LF channel with a signal output by the HF channel, and one or more circuit components including at least a gain adjust resistor (Rac) connected in series to the output of the pick-up coil to adjust a gain of the output signal of the pick-up coil to a gain of the output signal of the ASIC.
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