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Building the Kit: Before getting the soldering iron out, go through all of the parts in the kit and
familiarize yourself with each component and its placement. Most of the parts are common, but a
few of them may be new to some builders. There are just over 100 parts and 450 solder
connections, so take your time.
You will first wind the inductors on the nine T50-2 toroids (they are red and just over an inch in
diameter). Take care not to drop them, they will break. Using the #24 gauge wire provided, you will
wind a total of 8 inductors. L8 is two of the toroids placed together and the wire wound around
both of them. You can use super glue to hold them together so they will not slip when winding. L1-
4 wind in one direction and L5-8 wind in the other. The PC board is laid out with offset solder pads
for the toroids. If you wind them backwards, the offset will not match. Trim the wire to about ½ inch
and scrape away the insulation from the end. Don't solder them in until later. Save the left over
wire for later. It is used for connections on the SO-239s and grounds.
Refer to figure 1 for winding methods, and to the winding chart for lengths of wire and number of
turns. For consistency, we count one turn when the wire passes through the center of the toroid.
Inductor
L8 [double] 10.0
L7
L6
L5
L4
L3
L2
L1
- 5 -
Winding Chart
uH
Turns
33
5.0
32
2.5
22
1.2
15
.62
7 bottom
.33
5 bottom
.16
3 bottom
.09
2 bottom
Inches needed
38
23
17
13
7
6
4.5
2.5
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