PAM 8403 is a class d integrated amplifier that sounds good and energy efficiency. The ic requires only 5 volts for full 3 watts stereo (2 amperes 5 volts power supply need for full power) with 83 % efficiency @ 4 ohms load, so this amp board is good for battery power.
The amplifier board work well with 1-metre speaker cable so this amp is very stable and no need big power supply filter capacitor to eliminate hum from a power supply (Bass respond will be better if you add 2200 uf/16 volts electrolytic capacitor parallel to power supply filter. Make sure you connect electrolytic capacitor with correct polarity!!! or ka-boom.
PAM 8403 specification:
- 3W Output at 10% THD with a 4Ω Load and 5V Power Supply
- Filterless, Low Quiescent Current and Low EMI
- Low THD+N
- Superior Low Noise
- Efficiency up to 90%
- Short Circuit Protection
- Thermal Shutdown
If you plan to make a little amplifier that sounds good and energy efficiency so PAM 8403 is the right choice for you.
This video uses zoom h1 as USB mic for a nice result.
see sound testing video here.
See how to connect volume control to any amplifier board here
PAM8403 wiring diagram is here
See how to add a power supply filter capacitor to PAM8403 amp board to improve the amp board sound quality here
If you need more power 10 watts 8 ohms PAM8610 is the best choice for you
You may love class T amplifier sound, TA 2024 is a low-cost high-quality amplifier board, see review here