Turn your old speakers or Hi-Fi into Bluetooth, Airplay and Spotify receivers with a Raspberry Pi and this step-by-step guide
Building a Bluetooth DAC with Raspberry Pi Zero W – Page Fault Blog
Raspberry Pi Zero Docking Hub by MakerSpot » DIY Google Home With Bluetooth Speaker on Raspberry Pi Zero Docking Hub — Kickstarter
Audio HAT Module for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W/Pi Zero WH,WM8960 Hi-Fi Sound Card HAT Stereo CODEC, Play/Record : Amazon.ca: Electronics
Listen to Bluetooth Audio on Your Raspberry Pi 3, Pi Zero, or Earlier Pi – Plugable Technologies
Buy Raspberry Pi Zero W - Mibs Tech Solutions
Raspberry Pi Zero W, the low-cost pared-down Pi, with built-in WiFi and Bluetooth
Raspberry Pi Zero W 経由で PC の USB Audio 出力を Bluetooth Audio に変換する - Qiita
Raspberry Pi Zero W Bluetooth Text to Speech – Robot Zero One