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heat sink. Make sure that U1 sits level with respect to the PCB, then tighten the
mounting screw.
3. Place a line of thermal compound onto the back of U2, an LM3886. Use your
finger to smear the line into a thin film covering on the back of the LM3886. Save
the rest of the thermal compound for other steps in the assembly.
4. Insert U2 into the indicated space on the board, and fasten it into place using a 6-
32x3/8" screw (no built-in lockwasher) through the mounting hole and into the
heat sink. Make sure that U1 sits level with respect to the PCB, then tighten the
mounting screw.
5. Working from the solder side of the board, solder all the pins associated with U1
and U2.
Build and Install the Inductor Resistor Combination
The kit includes special magnet wire whose insulation is removed by the act of soldering.
The kit supplies 40" lengths of this wire. Cut the 40" length into two equal 20" lengths.
There will be a little left over from each length once you've completed each inductor-
resistor combination.
You'll create two such combinations. Here are the steps for each L-R combination:
1. Scrape 1/2" of the insulation off one end of the magnet wire using your diagonal
cutters. Be careful not to nick the conductor. You'll see the bright copper revealed
beneath the now removed red varnish. It's ok if some of the insulation remains. It
has a special formulation that melts in the presence of heat from a soldering iron.
Figure 10-Assembled amplifier on main heatsink
Page 21 of 36
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