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Install the Resistors
In general, you install the resistors by placing the body on the silk screen side of the
board, and the leads through the indicated holes. Bend the leads over on the back of the
board to keep the resistors from falling out until your solder them in place. Try to bend
the leads in a direction that won’t lead to solder bridges between traces that should
remain disconnected.
We recommend the following procedure:
1.
Insert all the resistors of the same value, bending the leads as described above.
2.
Solder the leads on the back of the board.
3.
Clip the leads just a bit beyond the end of the top of the solder joint.
To track your progress, place a checkmark in the done column as each resistor is
installed. Check resistor values with a meter
and
by reading the color code. Orient the
resistor with the fat brown band on the right, then you can read both the Color Code
column and the resistor from left to right.
Assembly begins with installing the small (1/4 Watt) resistors and will progress to the
larger (higher wattage) resistors.
Important Notes:
1.
The GT-108 is a dual channel amplifier. You will build two identical channels.
We’ve provided two Done columns, Done1 for the first channel you build, and
Done2 for the second channel. We recommend that you build the channels one
at a time, completing the first channel, then returning to this point to build the
second channel.
2.
With the exception of two resistors, a 1K 0.1% and a 20K 0.1% resistor, all of
the ¼ W resistors have 1% tolerance. The two 0.1% resistors are listed at the
end of the table.
3.
Save time and make it neater if you use the 0.4” setting on a lead-bender.
Designation Value
Color Code
Done 1 Done2
R22
24.9
Red, Yellow, White, Gold, Brown
R34
49.9
Yellow, White, White, Gold, Brown
R51
49.9
Yellow, White, White, Gold, Brown
R16
88.7
Gray, Gray, Violet, Gold, Brown
R10
100
Brown, Black, Black, Black, Brown
R11
100
Brown, Black, Black, Black, Brown
R14
100
Brown, Black, Black, Black, Brown
R15
100
Brown, Black, Black, Black, Brown
R52
100
Brown, Black, Black, Black, Brown
R21
200
Red, Black, Black, Black, Brown
R28
332
Orange, Orange, Red, Black, Brown
R29
332
Orange, Orange, Red, Black, Brown
R18
499
Yellow, White, White, Black, Brown
R3
1K
Brown, Black, Black, Brown, Brown
