This tiny audio amplifier is based on the Texas Instruments TPA2005D1. Its efficient class-D operation means low heat and long battery life. It can drive an 8-Ohm speaker at up to 1.4 Watts; it wonâ€™t shake a stadium, but it will provide plenty of volume for your audio projects. The fully-differential inputs are safe for floating audio signals such as from our MP3 Shield, and can also be connected to ground-referenced signals as well. A shutdown input is provided to save power when the amplifier is not being used, and a solder jumper and header are provided to connect a volume-control potentiometer (not included).Note: The amplifierâ€™s class-D design outputs a 250kHz PWM-like signal that is restored to an analog voltage in the speakerâ€™s coil. This is what makes the amplifier so efficient, but because of the switching frequency, you should keep the amplifier as close to the speaker as possible to minimize possible interference.Features:Extremely efficient class-D amplifier1.4W into 8 Ohms2.5V to 5.5V supplyFully differential audio inputs, can be ground-referenced as wellShutdown input with pullup and LED-follows-shutdown circuitryPTH pads provided to change gain resistors if desired (see datasheet for details)Solder jumper and header allow addition of a 10k volume control potentiometer (not included)Documents:SchematicEagle filesDatasheet (TPA2005D1)Quickstart GuideGitHub
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