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b. The LED is installed on the PCB in the spot marked LED. The LED, being a diode, is polarized
and must be installed in the correct orientation. If you get it backwards, the light won't work.
The long lead goes into the hole with the square pad (49,50). Make sure the standoff is
standing straight up. Bend the leads out on the bottom; flip the board over and solder and
clip the leads.
49
51
9. Battery snap: Feed the battery snap leads through the two holes in the PCB as shown, in the one
hole and out the other. This hole configuration acts as a strain relief, so when the battery snap is
pulled it won't stress the wire's solder joints. The wires get soldered to the "9V" port. The red
wire goes in the square hole and the black wire goes in the round hole.
53
55
50
52
54
56
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