Notes: The coils will be wound between the 2 discs of the plywood (thickness minimum 15mm), which are known as "ears". The small plywood rectangle between the two ears is the spacer: which determines the thickness of the coil. The inner shape of the coil is determined by the outer edges of the 4 large nails, this forms a rectangle of 46mm x 30mm. This rectangle corresponds to the dimensions of the magnets that will pass in front.
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