ELECRAFT 63
Ferrite-bead assemblies Z1 and Z2 will be installed vertically
near transformer T3 as indicated by their component outlines. To
make these assemblies, string two ferrite beads onto a 1" (25 mm)
length of bare hookup wire (or discarded component leads) as
shown in Figure 6-24.
Figure 6-24
Install Z1 and Z2, bending the leads on the bottom of the
board to hold them in place. Make sure that the beads are seated
flat against the PC board, then solder.
Locate D9, the 1N5711 diode which you identified and set
aside earlier. Install D9 near the right edge of the board.
Install electrolytic capacitors C126 (47 µF) and C137
(100 µF), Near the "ELECRAFT" label at the center of the board.
Insert the (+) lead of each capacitor into the hole marked (+).
Install electrolytic capacitor C125 (22 µF) which is near U1.
Install Q5 (2N5109). Be sure Q5 is firmly seated on the board
and has its tab oriented as shown by the component outline before
soldering.
Install the following components on the bottom of the board,
working from left to right.
__ R63, 220 (RED-RED-BRN)
Note: bend the leads of R58 exactly as shown by its component outline.
__ R58, 180 ohms, 1/2 watt (BRN-GRY-BRN)
__ RFC8, __ RFC9, __ RFC4, 10 µH (BRN-BLK-BLK)
__ RFC6, 0.68 µH (BLU-GRY-SILVER)
__ RFC5, 10 µH (BRN-BLK-BLK)
__ R50, 1.5 ohms, 1/2-watt (BRN-GRN-GLD)
__ R48, 120 (BRN-RED-BRN) __ R47, 47 (YEL-VIO-BLK)
__ R43, 22 (RED-RED-BLK)
__ R42, 4.7 ohms (YEL-VIO-GLD)
__ R44, 2.7 k (RED-VIO-RED)
Make sure you have separated the remaining slug-tuned
shielded inductors into 1 µH and 4.7 µH types. Install these
inductors in the order indicated below, on the top of the board.
These inductors are difficult to remove once soldered, so double-
check the part numbers. The 4.7 µH inductors are labeled "T1005,"
and the 1 µH inductors are labeled "T1050."
__ L3, 4.7 µH ("T1005") __ L4, 4.7 µH
__ L8, 4.7 µH __ L9, 4.7 µH
__ L10, 1 µH ("T1050") __ L11, 1 µH
__ L12, 1 µH __ L13, 1 µH
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