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Another idea:http://www.hpe.ee.ethz.ch/uploads/tx_ethpublications/Rogowski_Coil_02.pdfA Rogowski is for sensing current (the air-cored coil feeds an integrator circuit to produce a signal representative of the enclosed current), but the same idea applies if you're looking to make a spiral or multilayer (external rather than enclosed field) planar coil, transformer or sensor.Tim
eecook, varno has not been online since september 2017, you may have better luck sending him a private message, Dago however was online just a few days agoEqually interested in this, these designs seem quite painful to layout in most packages