Mini DC 5V 2 Channel 3W USB Digital Audio Amplifier

1. Working voltage: 2.5V-5.5V. Note: The power supply voltage should not exceed 5.5V, and the positive and negative connections of the power supply should not be reversed. 2. Speaker configuration: 4-8 ohms, recommended: 4 ohms; speaker power: 2-8W. 3. You can use the 5V power supply of the computer USB port, or use the 5V power supply of the USB port of the mobile phone charger, or use the lithium battery power supply. 4. High efficiency 90%, 4Ω load and 5V power supply conditions, can provide 3W (left channel) +3W (right channel) output power. The efficiency of class A and class B power amplifiers is only about 30%, and class D power amplifiers are highly regarded in today's green trend. 5. Class D power amplifier has extremely high efficiency, will not affect the sound quality due to temperature rise, and does not need to add a heat sink, which occupies a small volume. 6. The power amplifier board has a built-in noise elimination circuit, and there is no noise when the power is turned on/off; the module has short-circuit, over-current protection and over-temperature protection. 7. Board size: ★★★★ Ultra-micro volume: 1.85*2.11cm ★★★★