Note: Run the drill back as it self-tightens the bolt in the bobbin, go forward and it will just loosen off.Īn additional advantage to winding your own is you can make the flyleads as long as you like, which makes soldering them in much easier and allows you to have less PCB track around gathering capacitance. Using my finger and thumb to tension and guide the wire I just had to count to 38 and it was wound, and after about 5 minutes I had 4 nice inductors that actually measured exactly the same inductance as my 10uH Wurth ferrites I'd bought. The design tool posted above gives you all the sizes if you want to try thicker wire - next time I'd probably go up one or two sizes, you'd also need less turns if you did.Īfter mounting the coil of wire (a 500g reel) in my solder dispenser I hand fixed an M6 bolt in the reel, set the drill on slow and 'backwards/undo' to wind the coil. Thicker wire will fit in but this is dead easy to manage and I only bought this one size. I decided on AWG21 (0.72mm) wire giving a 0.05ohm DC resistance for a 10uH inductor needing 38 turns. So the bobbin's I chose are regular sewing bobbins, in plastic, mine measure 8.5mm dia in the middle and a length of 9mm for the coil. An externally hosted image should be here but it was not working when we last tested it.
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