Stereo 3.7W Class D Audio Amplifier - MAX98306

This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 3.7W channels into 3 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, its incredibly efficient (over 90% efficient when driving an 8Ω speaker at over a Watt) - 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 amplifier inputs go through 1.0uF 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" - which means they connect directly to the outputs, with no connection to ground. The output is a 360KHz 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 1.0uF input capacitors. We also include header to plug it into a breadboard, pre-soldered 3.5mm screw-terminal blocks so you can easily attach/detach your speakers, a pre-soldered 2x4 header, and a jumper to change the amplifier gain on the fly. You will be ready to rock in 15 minutes! Speakers are not included; use any 3ohm or greater impedance speakers.