Feature:

• 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%
• Can provide 3W (left channel) + 3W (right channel) output power in the 4Ω load and 5V power supply conditions
• A class, B class amplifier such efficiency is only about 30%
• D class amplifier is highly respected today
• 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 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

Specification:

• Operating Voltage: 2.5V to 5.5V
• Speaker With: 4Ohm to 8Ohm (recommended: 4Ohm)
• Speaker Power: 2W to 8W
• Size: 21 x 18 x 3.4mm

Application:

• LCD TVs, monitors
• Laptop
• Portable Speakers
• Portable DVD players, game consoles
• Phone / speakerphone

Note:

• First turn OFF and then powered speakers , or likely to cause damage to the chip;
• Because digital volume control module has a great gain , so do not let too much leaving the audio signal input signal cut limiter.

Documents:

• PAM8403 Datasheet
• Schematic