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Figure 14-The LM3886 sits up off the board to avoid shorts between the front and back rows of pins.
The body should be at right angles to the circuit board
Final Inspection of the Circuit Board
After you've taken a break, look over your completed circuit board(s) one more time.
Looking on the component side, double check:
1. polarity (banded end) of D1 and D4 matching the banded end on the silk screen.
2. polarity (flat end, or molded bar end) of LEDS D2 and D3, placed toward the
outside edge of the board.
3. polarity of C1 (minus sign away from the indicated plus sign on the silk screen).
4. polarity of C6 (minus sign away from the indicated plus sign on the silk screen).
5. polarity of C7 (minus sign close to the edge of the board).
If you get one of these polarities wrong, there is a good chance that the amplifier won't
work, or there will be damage when you power it up.
Look at the solder side of the board. Make sure that:
1. All component leads are soldered (it's easy to forget one or two, and that will
cause either unreliable operation, or no operation at all!)
2. There are no solder bridges between pads which should be isolated. Solder
bridges may stop the amplifier from working correctly.
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Troubleshooting
