PAM8403 Digital Power Amplifier Board 2.5-5V 2 * 3W Class D module can be powere

 PAM8403 Digital Power Amplifier Board 2.5-5V 2 * 3W Class D module can be powered by USB DESCRIPTION :
Product introduction: PAM8403 mini D-class digital amplifier board
1. Working voltage: 2.5V-5.5V. Attention: The power supply voltage should not exceed 5.5V, and the positive and negative terminals of the power supply should not be reversed. 
2. Speaker usage: 4-8 ohms, recommended usage: 4 ohms; Horn power: 2-8W. 
3. It can be powered by a computer USB port 5V power supply, or by a mobile phone charger USB port 5V power supply, or by a lithium battery power supply. 
4. With a high efficiency of 90%, it can provide 3W (left channel)+3W (right channel) output power under 4 Ω load
and 5V power supply conditions. The efficiency of Class A and Class B power amplifiers is only about 30%, while Class D power amplifiers are highly praised in the current green trend. 
5. Class D amplifiers have high efficiency, do not affect sound quality due to temperature rise, and do not require heat sinks, occupying a small volume.
6. The power amplifier board is equipped with a built-in noise cancelling circuit, and there is no popping noise when the power is turned on/off; The module has short-circuit overcurrent protection and over temperature protection.

Application: LCD TV, monitor Laptop computer Portable speaker Portable DVD player, game console Mobile phone/hands-free phone

Common customer questions: 
1. Can the mini digital amplifier board 2 * 3W Class D be powered by a computer? Answer: The amplifier board can be powered by a computer, but it may produce noise (some customers may not experience noise). It is recommended to power it independently. 
2. Is it good to use our store's speakers for the 2 * 3W D-class mini digital amplifier board? Answer: Our speakers are only available for DIY players to try out, and the sound effect is not particularly good. Customers who pursue high
sound effects can purchase them separately. 

3. Why is there noise from the speakers when the mini digital amplifier board 2 * 3W Class D is powered on? 
Answer: 1. When there is a whistling sound, it should be introduced by the audio input cable. A shielded cable should be used as the audio input cable, and the audio input cable should not be suspended and connected to the sound source. 2. Another possible reason could be poor power supply, with some switching power sources causing significant interference.
3. Try lowering the sound, or it may be due to excessive audio input causing the signal to be cut and limited. Noise suppression, even when there is no input audio, the ear is close to the speaker and no noise can be heard. Dual channel stereo, 5V power supply can output 3W+3W power, which can directly drive small speakers of 4 Ω and 8 Ω, with high output power, sufficient energy, and good sound quality. The D-class digital power board without LC filtering can be directly powered by a computer's USB. Dual panel wiring effectively solves the ground potential balance and crosstalk between sound channels caused by wiring. The ultra micro design allows for easy placement in small internal spaces of various digital products, enhancing efficiency. All machines are used for whole board welding, and the welding quality is comparable to manual soldering iron welding!

Attention: The "negative" of the left and right channel outputs cannot be connected together, otherwise it will burn the IC, and the speaker (load) should be connected before power on.

Key Applications🔹
USB-powered desktop speaker systems
Computer audio amplifier projects
Portable USB speaker builds
Embedded USB audio output for single-board computers
DIY amplified monitor speaker systems

Why Choose This Module?🔹
USB-powered — no external supply needed
Plug-and-play USB audio class compliance
Compact and lightweight design
Compatible with PC, Mac, Raspberry Pi, and more
Simple wiring to passive speakers
Low noise and clear audio output

Technical Specifications🔹
Input Interface: USB (Audio Class Compliant)
Supply: USB 5 V
Output Power: Varies by model (typically 2 × 3 W – 2 × 5 W)
Load Impedance: 4 – 8Ω Ω
Compatibility: Windows, macOS, Linux (driver-free)

What's Included🔹
1 × USB Digital Audio Amplifier Board

Pro Tip🔹
Use a USB 3.0 port or a powered USB hub for the most stable power delivery and cleanest audio output.💡

Note:⚠️
Output power is limited by USB 5 V supply. Do not connect high-impedance or power-hungry speakers expecting high volume levels.