What is a bobbin?
A bobbin is a fabricated or molded form used to hold the coil in place. A bobbin can be made from paper, vulcanized fibre, molded nylons and other plastics or Phenolics. The bobbin can be held together by rod magnets similar to Fender style pickups. A bobbin can be round or rectangular upon magnet wire is wound to a desired number of turns. The bobbin supports and shapes the coil as it is wound on some type of winding machine. The bobbin can be wound Top Coming or Top Going depending on the particular electrical polarity needed for phasing the coils with others.