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Better coils with 3D printed formers

A project log for Aurora Observatory

BLE Triaxial Earth Field Magnetometer to alert for Aurora Borealis activity and for earth field work

chasinspinChasinSpin 08/16/2015 at 23:480 Comments

3D printed coil formers for 3 test coils now completed. Coils were wrapped fairly haphazardly in a left-right-left-right formation. Windings were stabilized from unwinding with superglue and some hot glue at the ends.

Coil 1: One wire wrapped around small 3D Printed former, approx 35AWG (0.15mm), 2000 wraps, security tag strip cut in half lengthways (1/8 x 1.5 inches) inserted inside former. Resistance: 46.7Ohms

Coil 2: Two wires wrapped together, around small 3D Printer former, approx 35AWG (0.15mm), 500 wraps, security tag strip cut in half lengthways (1/8 x 1.5 inches) inserted inside former. Resistance: 9.6Ohms (per single wrap)

Coil 3: One wire wrapped around large 3D Printer former, approx 35 AWG (0.15mm), N wraps. Core left empty to accept toroids inserted inside. Resistance: 91.8 Ohms

Top to bottom: Coil 3, Coil 1, Coil 2

Showing 3D printed former for the smaller cores, and the finished wound coil showing the placement of the security tag strip (insert fully inside):

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