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

Bluetooth Audio Receiver Circuit Diagram

10+ bluetooth receiver circuit diagram Dc 5v bluetooth audio module bluetooth receiver universal audio

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10+ Bluetooth Receiver Circuit Diagram | Robhosking Diagram

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Bluetooth audio receiver module

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

Bluetooth Audio Receiver Module - Stereo Output - 5V DC Operation
Bluetooth Audio Receiver Module - Stereo Output - 5V DC Operation

DC 5V Bluetooth Audio Module Bluetooth Receiver Universal Audio
DC 5V Bluetooth Audio Module Bluetooth Receiver Universal Audio

Bluetooth Transmitter And Receiver Circuit Diagram - Wiring Site Resource
Bluetooth Transmitter And Receiver Circuit Diagram - Wiring Site Resource

10+ Bluetooth Receiver Circuit Diagram | Robhosking Diagram
10+ Bluetooth Receiver Circuit Diagram | Robhosking Diagram