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Turn your old speakers or Hi-Fi into Bluetooth, Airplay and Spotify receivers with a Raspberry Pi and this step-by-step guide
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Digital to Analog Audio Converter with Bluetooth 5.1 Receiver,Digital Optical to 3.5mm DAC Wireless Adapter, Coaxial to Analog L/R RCA 3.5mm for TV, Gaming, CD Player, MP3: Amazon.com: Industrial & Scientific
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Amazon.com: Anything Speaker, Conduction Speaker, Turn Any Surface into a Speaker, Mini Speaker, Anything Multifunctional Portable Bluetooth Wireless Speaker Music Player : Electronics
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Wireless Audio Receiver Multiroom Adaptor for Speaker Systems Convert Wired Speakers into Wireless Airplay WiFi Aux Ethernet Bluetooth and Remote Control Compatibility: Amazon.co.uk: Electronics & Photo
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How to Make Bluetooth Speakers from Bluetooth Headset | Convert Old Speaker into Bluetooth Speaker - YouTube
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