BT audio receiver template stereo wireless audio speaker power amplifier refit DIY Bluetooth module 4.0
1. +5V power supply: connect the positive electrode of the power supply and the voltage range is 4.2v ~5V. Please make sure the power supply is within this range.
2. Ground: GDN is connected to the negative pole of power supply;
3. Left channel: connect the left channel input of the amplifier board or the left channel of the headset, and it is suggested to connect a capacitor at this output port (depending on the input matched by the amplifier);
4. Right channel: connect the right channel input of the power amplifier board or the right channel of the headset. It is suggested to connect a capacitor at this output port (depending on the input matched by the power amplifier);
5. Silent output port: the port is preset to high level, and the port outputs low level when silent.
6. Status indicator light: when the bluetooth is not connected, the light will flash quickly. Once the bluetooth connection is successful, it will become a slow flash;
7. Reserved port: the port has been pulled up to 5V. When the port is triggered by a low level, it will be shut down.
Matters needing attention:
1, power supply: bluetooth audio module belongs to sensitive to high frequency interference circuit, the proposal USES linear regulated power supply, if the DC - DC power supply, please join the LC filter, reducing the power harmonic interference, especially use the switch power supply, such as mobile phone charger, switching power supply ripple may cause the bluetooth connection properly, and this kind of 5 V output, usually between 5.1 V ~ 5.4 V, exceed the working voltage of the bluetooth audio module;
2. Grounding: since audio signals are sensitive to the interference caused by the receiving site, when the module is connected with the power amplifier, try to solder on the circuit board. Do not use lead connection (easy to be disturbed).
3. Antenna interference: bluetooth antenna is extremely vulnerable to high frequency or strong electromagnetic signal interference. Relatively speaking, it should be kept away from the strong signal of power amplifier board.
4. Enclosure shielding: because the metal enclosure is shielding the bluetooth signal, it may attenuate the bluetooth signal, resulting in poor reception, please keep the corresponding opening or exposure.
Status indicator light wiring diagram:
Due to the weak drive capacity of the module, it is suggested that the LED lamp should be red LED, or the additional audion should be used to drive the LED lamp.
2. Mute port, the output level is about 3V. If the power amplifier board of the back stage is low level, it will be directly connected.
3.There are two types of noise, one that USES bluetooth to process signals coming in from a standby. This is inherent, but it doesn't sound very loud. Another type of noise, caused by interference or wiring, can be modified by the line and improved access point, which can be treated in accordance with the method described above.
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