Download video: Winding a flat spiral coil for the surf pi 1.2
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winding a coil for the surf pi 1.2 with 10/0.1mm stranded wire. Insulation is 0.3mm pvc. Coil dimensions are ID: 13.5 cm; OD: ~21 cm. Calculated induction is ~275 microHenry. See link for online calculator: http://coil32.narod.ru/calc/flat_spiral_coil-en.html