{"title":"Adafruit I2S Amplifier BFF Add-On for QT Py and Xiao","handle":"adafruit-i2s-amplifier-bff-add-on-for-qt-py-and-xiao","url":"/products/adafruit-i2s-amplifier-bff-add-on-for-qt-py-and-xiao","description":"The Adafruit I2S Amplifier BFF is a compact add-on that brings high-quality 3W audio to any QT Py or Xiao development board. Featuring a MAX98357 Class D amplifier, it delivers crisp I2S digital audio using just three GPIO pins (A0, A1, A2) that don't conflict with I2C, UART, or SPI.\n\nDesigned as a \"Best Friend Forever\" board, the BFF mounts directly onto the back of your QT Py or Xiao — solder it permanently or use pin and socket headers for a removable setup. Connect a 4Ω or 8Ω speaker via the onboard picoblade-compatible connector and you're ready to play audio.\n\nKey Features\n\n\nMAX98357 3W Amplifier – Class D I2S amplifier pre-configured for stereo mix output at 9 dB gain\n\nBFF Form Factor – Mounts directly onto the back of any QT Py or Xiao board\n\nPicoblade Speaker Connector – Easy plug-in connection for 4Ω or 8Ω speakers\n\n3-Pin I2S Interface – Uses A0 (data), A1 (word select), A2 (bit clock) — no conflict with I2C/UART/SPI\n\nWide Chipset Compatibility – Works with ESP32, nRF52840, and RP2040-based QT Py and Xiao boards\n\nSolderless or Permanent – Use headers for a removable connection or solder in place\n\n\nIdeal For\n\nCompact audio playback projects with QT Py or Xiao\nPortable sound devices and notification systems\nIoT projects requiring audio feedback\nSpace-constrained builds needing amplified speaker output\n\n\nPackage Contents\n\n1× Adafruit I2S Amplifier BFF PCB (assembled and tested)\n1× Header for soldering to QT Py\n\n\n\nCompatibility Note: This BFF does not work with the original ATSAMD21 QT Py, as its A0–A2 pins are not I2S capable. We recommend the QT Py RP2040 or any ESP32-based QT Py instead.\n\n\n\nNote: Speaker and QT Py board are not included.\n\n\nResources\n\nAdafruit I2S Amplifier BFF Guide\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":1592,"title":"Default Title","sku":"AF-5770","price":10.05,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":12,"option1":"Default Title"}]}