■ FIGURE 3. Winding the transmitter coil.
Cut a 1” diameter disc from any mylar material. The
disc thickness needs to be the same thickness as your
wire. I had some 26 AWG enameled
magnet wire from a previous project, but
any gauge wire (within reason) will work.
Drill a 3/16” hole in the center of the two
acrylic blocks and in the center of the 1”
mylar disc. To make the “U” shaped cut-outs, drill a 1/4” hole that straddles a
portion of the 1” disc as shown. With a
dremel cutting wheel or hacksaw, cut the
block from the edges to the 1/4” hole so
that it matches the shape in Figure 2.
Using a machine screw, make sure the
pieces can be assembled (refer again to Figure 2). Insert
one end of the wire as shown leaving about 6”, and wind
the coil as
Figure 3; keep a
slight tension on
the wire as you
■ FIGURE 4. Applying glue to freeze finished coil design.
■ FIGURE 5. Method for creating receiver coil.
■ FIGURE 6.