Abstract
Complete details are given of a 1 kw precision magnet current supply. Series transistors are used as the regulating element, controlled by a solid state chopper amplifier. The nature of the feedback system permits use of the supply with magnets of any impedance and with large amplitude (500 v r.m.s. 50 c/s) external magnet modulation. D.C. drift is less than 10 parts per million per hour and noise in the 0.1-1 c/s band less than 1 part per million.
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