pinout.vvzero.com/draft/overlay/audioplus_speakerplus.md

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#Audio+ Speaker+ 2X5W STEREO AMP FOR ONBOARD/EXTERNAL SPEAKERS

-Any portable radio project where you need built in speaker

-Power directly your old speaker

-No extra power supply required

INSTALLATION for Raspian users:

-Insert your Rapsberry Pi Shield in your Raspberry pI then turn it on

-Open a terminal (yes the black window thing) and type this to download the bash file and run it:

sudo wget -O - script.raspiaudio.com | bash

-Say yes for the reboot

-On the next reboot you have to run the test to finish the installation (it is an ALSA oddness):

sudo speaker-test -l5 -c2 -t wav

On the next reboot you will be able to control the volume from your desktop or by using the line command tool alsamixer

Features:

(There is no microphone on this board, for microphone see our other model MIC+)

  1. 2x5w Stereo Amplification 2 onboard speaker included

  2. DAC I2s 24-bit audio with studio sampling quality

  3. Line out stereo 3.5mm jack

  4. Onboard red button, 1 status led

  5. Extention screw terminal for external speakers (2 to 8 ohm)

  6. Extention screw terminal for external push button, external led.

  7. Soldered Long female header 2x20 (NO soldering required) Compatible with Raspberry Pi 3, 2, B+, A+, and Zero