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🎉  Happy 13th Birthday Raspberry Pi!   🎂   1,000+ deals in store!   🥳

Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302

by Adafruit

This super small mono amplifier is surprisingly powerful - able to deliver up to 2.5 Watts into 4-8 ohm impedance speakers.

Inside the miniature chip is a class D controller, able to run from 2.0V-5.5VDC. Since the amp is a class D, its very efficient (over 90% efficient when driving an 8Ω speaker at over half a Watt) - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell it got hot. There's even a volume trim pot so you can adjust the volume on the board down from the default 24dB gain. This board is a welcome upgrade to basic "LM386" amps!

The A+ and A- inputs of the amplifier go through 1.0uF capacitors, so they are fully 'differential' - if you don't have differential outputs, simply tie the Audio- pin  to ground. The output is "Bridge Tied" - that means the output pins connect directly to the speaker pins, no connection to ground. The output is a high frequency 250KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard. All the above means that you can't connect the output into another amplifier, it should drive the speakers directly.

Comes with a fully assembled and tested breakout board. Also included are a header to plug it into a breadboard and a 3.5mm screw-terminal blocks so you can easily attach/detach your speaker. You will be ready to rock in 15 minutes! Speaker is not included, use any 4 ohm or greater impedance speaker.

  • Output Power: 2.5W at 4Ω, 10% THD, 1.5W at 8Ω, 10% THD, with 5.5V Supply
  • 50dB PSRR at 1KHz
  • Filterless design, with ferrite bead + capacitors on output.
  • Fixed 24dB gain, onboard trim potentiometer for adjusting input volume.
  • Thermal and short-circuit/over-current protection
  • Low current draw: 4mA quiescent and 1uA in shutdown mode

Note: The terminal block included with your product may be blue or black.

TECHNICAL DETAILS

Dimensions (without 0.1" header):

  • 15mm x 24mm x 2mm / 0.6" x 0.9" x 0.08"
  • Weight: 1.4g

3 customer reviews

2 years ago
Works perfectly as advertised, good documentation and a nice set of example programs. I can take it from there. I have been thinking of but not actually buying it for literally years - the recent sale made me a buyer. Just the thing to amuse the piano-playing members of my family.
by Peter about Piano HAT via REVIEWS.io
5 years ago
Good fun to tinker with. Well built and of the highest quality.
by Daniel about Piano HAT via REVIEWS.io
9 years ago
Recently purchased one of these piano hat boards for my raspberry pi, as usual the service from Pimoroni was excellent and the board is of a really good quality. It's nicely laid out and the touch pads are a decent size. The board looks very classy with the black background and gold lettering and the software to go with it makes using the board very easy. Although it's laid out as a piano it could be used for anything which requires 16 capacitive touch pads and leds.
by Steve about Piano HAT via REVIEWS.io

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