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Testing and Debugging
Note: the most common problem that arises with electronics projects such as this one are lose wires and/or connections. If you run into a problem during this project, always make sure to check your connections. If this does not fix the problem, try testing with some components switched out for others, as their may be defective ones.
Amplifier
In order to test the amplifier out, start by placing the volume of your computer on low, and the arrow of the potentiometer to one end. Connect the two speakers to their respective terminals using 20 AWG speaker wire. Plug in the AUX cord, and the power supply. Slowly turn up the volume on your computer until you start to hear music. Then play with the potentiometer to see which way increases the volume. If the potentiometer does not adjust the volume, make sure that all of your connections are soldered correctly. I had this problem during my setup, and I figured out that it was actually just a broken potentiometer. However, always check your connections before you determine dead parts. Turn up the volume to a desired level, and try out the setup with different songs to make sure everything is working well. If any song sound a bit off, that may be just the quality of the speakers and/or wiring. This can be fixed by investing in higher quality components, however this will probably not be a problem with speakers of this size.
LEDs