{"id":601,"date":"2015-07-14T13:58:20","date_gmt":"2015-07-14T13:58:20","guid":{"rendered":"http:\/\/www.donluc.com\/?p=601"},"modified":"2015-07-14T14:03:48","modified_gmt":"2015-07-14T14:03:48","slug":"adafruit-stereo-3-7w-class-d-audio-amplifier-max98306","status":"publish","type":"post","link":"https:\/\/www.donluc.com\/?p=601","title":{"rendered":"Adafruit – Stereo 3.7W Class D Audio Amplifier – MAX98306"},"content":{"rendered":"

\"Adafruit<\/a><\/p>\n

\"Adafruit<\/a><\/p>\n

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Adafruit:<\/strong> 987<\/p>\n

Description<\/strong><\/p>\n

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 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!<\/p>\n

The inputs of the amplifier 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” – that means they connect directly to the outputs, 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.<\/p>\n

Comes with a fully assembled and tested breakout board with 1.0uF input capacitors. We also include header to plug it into a breadboard, 3.5mm screw-terminal blocks so you can easily attach\/detach your speakers, and a 2×4 header + jumper to change the amplifier gain on the fly. You will be ready to rock in 15 minutes!<\/p>\n