BT audio player: Circuit and PCB

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BT audio player: Circuit and PCB

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Wireless Voice Controlled Robot Car Using Arduino
Wireless Voice Controlled Robot Car Using Arduino

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Why would this design work with some BT modules and not with others
Why would this design work with some BT modules and not with others

BT-4558 Amp Filter Bass Treble Control, Tone Control BT Board for Bass
BT-4558 Amp Filter Bass Treble Control, Tone Control BT Board for Bass

Pcb Layout Manufacturing - Home Wiring Diagram
Pcb Layout Manufacturing - Home Wiring Diagram

BT TM-7 Circuit Board
BT TM-7 Circuit Board

Bien BT-R06LANQ Circuit Board - Used - Mara Industrial
Bien BT-R06LANQ Circuit Board - Used - Mara Industrial

Layout PCB Driver Power TBM DUAL INPUT – BLOGKAMARKU
Layout PCB Driver Power TBM DUAL INPUT – BLOGKAMARKU

Empire BT Parts Circuit Board
Empire BT Parts Circuit Board

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bluetooth - I don't understand a couple of symbols on this diagram

BT audio player: Circuit and PCB
BT audio player: Circuit and PCB

Empire BT Parts Circuit Board
Empire BT Parts Circuit Board