VCC: voltage range 4.2V to 5V, in particular, can not exceed 5V power supplyGND: PowerL: Left channel outputR: Right channel outputMUTE: high level when muted, normally lowKC: Empty PinThe Bluetooth audio module requires very high power, otherwise it will affect the audio quality. The power supply must be provided if the LC filter circuit, especially the switching power supply.Module sizePCB : 25*15.5*2.4MMPin pitch: 2.54MMcommon problem:1, search less than blue:Generally caused by power interference, the power line must be coupled with the LC filter circuit.2, whether to support 3.7V power supply:The module is powered by 5V by default. You can replace the diode on the JDY-62 module with the 0805 OR resistance, or use a wire to short circuit, so that you can use a lithium battery3, Bluetooth signal is too weakDo not route or cover copper under the antenna of the Bluetooth module. There must be no metal shielding around the antenna.4, the current sound is too loudGenerally caused by the power supply interface interference, it is recommended that the power amplifier wiring is not too long, the Bluetooth port and the power port are separated