limitless products PAM-8403 (Pack oF 5) Dc Amplifier Board Class D Usb Power Audio Module, 5v, 3w, Green Micro Controller Board Electronic Components Electronic Hobby Kit

Features 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 high efficiency: 90 percent can provide 3w (left channel) +3 w (right channel) output power in the 4o load and 5v power supply conditions a class, b class amplifier such efficiency is only about 30 percent d class amplifier is highly respected today d class amplifier efficiency is extremely high, not because of temperature affect the sound but do not add heat sink and take less space noise cancelling circuit was built in the amplifier board power on / off without pop noise module has a short-circuit current protection and over-temperature protection application: lcd tvs, monitors, laptop portable speakers portable dvd players, game consoles phone / speakerphone specifications operating voltage: 2.5v-5.5v speaker with: 4-8ohms recommended: 4 ohms speaker power: 2-8w size: 21 x 18 x 3.4mm(l x w x h) colour: as the pics show net weight: 1g note: first turn and then powered speakers, or likely to cause damage to the chip ;do not let too much leaving the audio signal input signal cut limiter miniature digital power amplifier board 2x3w class d power amplifier board, can work on usb power supply. Good noise suppression input audio should be via sheilded wire dual channel stereo output 3 w + 3 w power works with 5v power supply can directly drive 4 o/8 o small speakers big output power, sound is good. Unique without lc filter class d digital power board can use computer usb power supply directly double panel wiring, super mini design, can easily fit in a variety of digital products high amplification efficiency made with solid plate welding machine