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For L2, use the FT37-43 (black) core and 24" of the supplied magnet wire. You are winding a
total of
25
turns, with a tap at
wire goes through the center of the core, it counts as one turn. Use the same twisted technique
for the tap as L1. The total of 25 turns will completely fill the toroid.
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Next, bend the leads as shown below, trim to 1/4" long, and tin the leads prior to soldering them
to the backside of the board. The magnet wire supplied Is Thermaleze® brand and will tin easily
with a soldering iron. Always tin the leads before trying to solder them in place and you will
greatly eliminate any continuity problems.
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Solder L1 where indicated on the PCB, and centered on the screw hole. You will notice the tap
hole is indicated, and is slightly larger in diameter to accept the double twisted wire. Install the
toroid flush with the backside of the board.
with a nylon screw, nylon washer and nut.
5
turns from the beginning of winding. Remember, every time the
Do not elevate it off the board.
4
8
Page
of
We will be securing it
efhw_tuner_assy_090110.pdf
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