Adafruit Stereo 2.1W Class D Audio Amplifier - TPA2012

Key Features: Designed for use without an output filter, when wires are kept at under 2"-4" long
Four pin-selectable gains: 6dB, 12dB, 18dB and 24dB Excellent click-and-pop suppression Thermal shutdown protection This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 2.1W channels into 4 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.7V - 5.5VDC. Since the amp is a class D, it' s incredibly efficient - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell it got hot. This board is a welcome upgrade to basic "LM386" amps! The inputs of the amplifier go through 1.0 uF capacitors, so they are fully ' differential' - if you don' t have differential outputs, simply tie the R- and L- to ground. The outputs are "Bridge Tied" - that means they connect directly to the outputs, no connection to ground. The output is a ~300KHz square wave PWM that is then ' averaged out' by the speaker coil - the high frequencies are not heard. All the above means that you can' t connect the output into another amplifier, it should drive the speakers directly.

Comes with a fully assembled and tested breakout board with 1.0 uF input capacitors. Also included is a dual mini DIP switch for setting the amplifier gain on the fly, 3.5 mm screw-terminal blocks so you can easily attach/detach your speakers, and some header in case you want to plug it into a breadboard. You will be ready to rock in 15 minutes! Item Specifics Size (without 0.1" header): 1.11" x 0.19"
Weight: 2.56 g
Output Power: 2.1W at 4 ohm, 10% THD, 1.4W at 8 ohm, 10% THD, with 5V
Supply PSRR: 77 dB typ @ 217 Hz with 6 dB gain Speakers are not included, use any 4 or 8 ohm speakers.