Special feature:
Can use the 5V power supply of the computer USB port or the 5V power supply of a mobile phone charger via the USB port. Battery power can also be used.
High efficiency: 90%.
The 5V power supply can output 3W (left channel) + 3W (right channel), and can directly drive small 4Ω and 8Ω speakers.
The efficiency of the D-class amplifier is extremely high - the sound quality is not affected by the temperature.
However, do not add a heatsink and take up less space.
The noise reduction circuit was integrated into the amplifier board.
Switch on/off without popping noises.
The module has short-circuit current protection and over-temperature protection.

Specification:
Operating voltage: 2.5V ~ 5V, maximum operating voltage 5.5V
Speaker with: 4Ω ~ 8Ω (recommended: 4Ω)
Speaker power: 2W ~ 8W
Size: 21 x 19 x 3.4mm (L x W x H)

Application:
LCD TVs – monitors
Laptop
Portable speakers
Portable DVD players – game consoles
Telephone/speakerphone

Note:
1.Turn on the speakers first and then the power - otherwise damage to the chip may occur;
2.Since the digital volume control module has a large gain, the limiter of the audio signal input signal must not be cut off too much.

Package include:
5 x PAM8403 Audio Module USB DC 5V Class D 2*3W Digital Amplifier Board