Product Description
This is an ultra-compact PAM8403 Class D digital amplifier board, measuring only 18.5×21.1mm, one of the smallest amplifier modules on the market.
Features excellent noise suppression performance, no audible noise even when ear is close to the speaker without audio input. Adopts unique non-LC filter design, can be directly powered by computer USB port.
All components are machine-welded for consistent quality, perfect for ultra-small space audio projects, DIY mini speakers, toy audio modification and portable device upgrades.
Technical Specifications
- Model: PAM8403
- Amplifier Type: Class D (No LC filter required)
- Rated Working Voltage: DC 2.5V-5V
- Maximum Limit Voltage: 5.5V
- Output Power: 3W×2 Stereo (5V input)
- Supported Speaker Impedance: 4Ω / 8Ω
- Product Size: 18.5×21.1mm
- Welding Process: Full automatic machine welding
Core Features
- ✅ Ultra-miniature design, easily fits into the smallest digital devices
- ✅ Excellent noise suppression: No background noise in silent state
- ✅ Unique non-LC filter design, direct USB power supply compatible
- ✅ Double-sided PCB wiring, eliminates ground potential imbalance and inter-channel crosstalk
- ✅ High amplification efficiency and low power consumption
- ✅ Full machine welding, stable and reliable quality
- ✅ Clear and energetic sound quality for small audio systems
Frequently Asked Questions (FAQ)
1. **Can I power this board from a computer USB port?**
Yes, it supports USB power supply. Note that some computers may produce slight noise due to power interference. For best sound quality, we recommend using an independent stable 5V power supply.
2. **What kind of speakers work best with this amplifier?**
It can directly drive 4Ω or 8Ω small speakers. For optimal performance, we recommend using speakers with power rating between 3W-10W.
3. **Why is there noise coming from the speaker after power on?**
- If you hear whistling noise: Use shielded audio input cables and ensure the audio input is properly connected to a sound source (do not leave it hanging)
- If you hear humming noise: This is usually caused by poor quality or noisy switching power supplies. Try using a different stable 5V power supply.
⚠️ CRITICAL USAGE WARNINGS
1. **NEVER** connect the negative terminals of left and right channels together, this will permanently burn the amplifier IC
2. **Always connect speakers (load) first before powering on** the amplifier board
3. Do not exceed 5.5V input voltage to avoid damaging the module
Applicable Scenarios
- DIY ultra-mini portable speakers
- Toy audio modification
- Small electronic device audio upgrades
- Headphone amplifier projects
- USB powered audio systems
- Compact multimedia devices
Notes
1. Slight 1-2mm size deviation exists due to manual measurement
2. Item color may have minor differences influenced by different monitor displays and lighting conditions
3. Use a stable DC 2.5V-5V power supply for best performance
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