Description
This incredibly small stereo amplifier is surprisingly powerful, delivering 2 x 2.1W channels into 4 ohm impedance speakers (@ 10% THD). It features a class D controller that runs from 2.7V-5.5VDC, providing high efficiency (89% efficient at 1.5W into 8Ω speakers), making it ideal for portable and battery-powered projects.
The amplifier includes built-in thermal and over-current protection and remains cool in use. It offers fully differential inputs with 1.0uF capacitors, and the outputs are bridge-tied to drive speakers directly. The board comes fully assembled with 1.0uF input capacitors, a dual mini DIP switch for gain selection, 3.5mm screw-terminal blocks for easy speaker connections, and header pins for breadboard use. Speakers are not included, but any 4Ω or 8Ω impedance speakers will work.
- Output Power: 2.1W at 4Ω, 10% THD; 1.4W at 8Ω, 10% THD (5V supply)
- PSRR: 77 dB typical @ 217 Hz with 6 dB gain
- Designed for use without an output filter (wires under 2-4 inches long)
- Selectable gain: 6dB, 12dB, 18dB, 24dB via onboard switches or G0/G1 pins
- Excellent click-and-pop suppression
- Thermal shutdown protection
- Independent channel shutdown
- Low current draw: typical 6mA quiescent, 1.5µA in shutdown
For more details, check the Adafruit tutorial. Note that the terminal blocks may be blue or black.
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