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Low-cost bidirectional coil driver with microamp precision

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We describe a compact constant current power supply with µA precision designed to drive coils. The unit generates currents from −125 mA to 125 mA with a load up to 10 Ω using a precision 16-bit digital to analogue converter, driven from a microcontroller (e.g. Raspberry Pi Pico). All power for the unit is derived from the 5 V of the microcontroller. As a demonstration of the capability of the power supply, it was applied to spin manipulation in a helium spin echo system.


Funder: China Scholarship Council; doi:

Funder: Cambridge Trust; doi:


power supply, helium spin echo, coil driver

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IOP Publishing
Engineering and Physical Sciences Research Council (EP/T00634X/1)