PAM8403 is an amplifier that can be used to play songs from Arduino. However, due to limitations, Arduino results can not be optimal, but if you want to play a song with a low cost of Arduino then able to use this way.
This is a 3 Watt amplifier 4/8 ohms. Should be connected with 4/8 ohm 3W speaker sound produced juga. Sehingga can be maximized.
If 3Watt amplifiers used in smaller watt speakers, it can make the speaker is damaged due to overload, but when tested may appear sound but very small. Meanwhile, if the 3-watt amplifier fitted in the larger-watt speakers, this could make the amplifier heat and could damage the amplifier. If a smaller ohm speaker then also can damage the amplifier because the amplifier must supply more. Whereas if smaller ohm speaker then it is not a problem but the sound produced was not optimal.
Through the above, connect the L and R to digital 9 already branched. Ground to GND, 5V to 5V, and - to GND. In the speaker is usually a sign + and -. Do not put the cart before the horse between + and -
Files that can be used is the 8-bit, 16000Hz
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