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Tiny Stereo Amplifier with Volume Knob — PAM8403
The PAM8403 Audio Amplifier with Volume Control is one of the smallest and most popular stereo amplifier boards for maker projects. It outputs 2×3W of clean audio from a 5V USB supply, making it perfect for battery-powered Bluetooth speakers, Raspberry Pi audio, desktop gadgets, and portable sound systems.
Why you'll love it
- 5V powered: Runs from USB, power banks, or 3×AA batteries
- Built-in volume pot: Adjustable volume right on the board
- Filterless Class D: No bulky output inductors needed
- Ultra-compact: Barely larger than a postage stamp
Small amplifier comparison
| Module | Power | Supply | Volume control | Best for |
|---|---|---|---|---|
| PAM8403 (this) | 2×3W | 5V | Yes (built-in pot) | USB/battery speakers |
| TPA2012 | 2×2.1W | 2.5–5.5V | No | Compact embedded audio |
| MAX98306 | 2×3.7W | 2.7–5.5V | No (gain select) | Louder portable projects |
| MAX98357A | 3W mono | 2.5–5.5V | No | I2S digital audio |
Technical specifications
| Chip | PAM8403 |
|---|---|
| Output Power | 2×3W (4Ω, 5V) |
| Channels | 2 (stereo) |
| Supply Voltage | 2.5–5.5V DC |
| Volume Control | Yes (onboard potentiometer) |
| Class | Class D (filterless) |
Frequently Asked Questions
Can I power it from a Raspberry Pi USB? Yes. It draws minimal current at idle and works great with Pi audio projects.
Is 3W per channel loud enough? For a desktop speaker or small boombox, yes. For larger rooms, step up to the MAX9744 (20W) or TPA3116D2 (50W).
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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