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220 uF electrolytic capacitor

This capacitor is decouples the audio amplifier IC from the jack and speaker pads. The board is designed so that you lay this capacitor on it side to allow for other boards to be stacked on top of this one. This part can be identified with the 220uF marking next to the banner. Note the (+) sign on the board to indicate polarity. Place the capacitor into the holes, and bend the pins at 90 degrees to allow the capacitor to sit flat on its side. Orient the capacitor flat and such that the (-) banner faces towards the audio jack.