If you're working with DIY projects and need a small speaker output, truly this little gem is a great to have and a serious sounding device to own. Features: 1.Small footprint(1.85 x 2.11 cm),Loud amplification 2.Two-channel stereo, single 5V power supply, can directly drive any 4-8 ohms speakers 3.High output power, good sound quality 4.Can use the computer USB port 5V power supply or using a mobile phone charger USB port 5V power supply, battery power can also be used 5.High efficiency:85%, can provide 3W (left channel) +3 W (right channel) output power in the 4O load and 5V power supply conditions 6.A class, B class amplifier such efficiency is only about 30%, D class amplifier is highly respected today 7.D class amplifier efficiency is extremely high, not because of temperature affect the sound quality,but do not add heat sink and take less space 8.Noise canceling circuit was built in the amplifier board 9.Power on / off without pop noise 10.Module has a short-circuit current protection and over-temperature protection Application: Raspberry Pi Projects Portable Speakers(Bookshelf Speakers) Radios LCD TVs, monitors Portable DVD players, game consoles Phone/headphones Specifications: Operating voltage: 2.5V-5.5V Power:3W SNR:90dB Speaker With:4-8ohms, recommended:4 ohms Speaker Power :2-8W high efficiency:85% Size:21 x 18 x 3.4mm(L x W x H) Color:As the pics show Net weight:1g Package Lists: 5 x Super Mini Digital Power Amplifiers Board Note:Left and right channel output of the "negative" and can not be together,otherwise it will burn IC, and speaker(load) should be connected before power on
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