Adafruit
Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302
The Adafruit Mono 2.5W Class D Audio Amplifier delivers powerful sound from a tiny package. Based on the PAM8302 chip, it drives 4–8 ohm speakers at up to 2....
The Adafruit Mono 2.5W Class D Audio Amplifier delivers powerful sound from a tiny package. Based on the PAM8302 chip, it drives 4–8 ohm speakers at up to 2.5 W with over 90% efficiency — making it ideal for portable and battery-powered audio projects. A significant upgrade over basic LM386-based amplifiers.
The amplifier runs from 2.0–5.5 V DC and includes built-in thermal and over-current protection. An on-board trim pot lets you adjust volume down from the default 24 dB gain. The differential inputs pass through 1.0 µF coupling capacitors, and the bridge-tied output connects directly to the speaker — no connection to ground required.
Key Features
- 2.5 W Output – Into 4 Ω at 10% THD; 1.5 W into 8 Ω (at 5.5 V supply)
- Class D Efficiency – Over 90% efficient at 8 Ω, half-watt load
- Wide Supply Range – 2.0–5.5 V DC, perfect for battery power
- Volume Trim Pot – Adjustable from the fixed 24 dB gain
- Differential Inputs – AC-coupled via 1.0 µF capacitors; tie A− to ground for single-ended sources
- Bridge-Tied Output – Drives speakers directly; not designed to feed another amplifier
- Built-In Protection – Thermal shutdown and short-circuit/over-current protection
- Low Power Draw – 4 mA quiescent, 1 µA in shutdown mode
- Filterless Design – Ferrite bead + capacitors on output; 50 dB PSRR at 1 kHz
Ideal For
- Portable and battery-powered audio projects
- Adding sound output to microcontroller projects
- Alarm and notification systems
- Interactive exhibits and installations
Package Contents
- 1× Adafruit PAM8302 Mono Class D Amplifier Breakout (assembled and tested)
- 1× Header strip
- 1× 3.5 mm screw terminal block (colour may vary)
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- Terminal block
- A connector used to join wires together in a neat, removable, or serviceable way. For this product, it helps split one power input into several outputs without soldering.
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