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Bluetooth audio modul koji moze da se napaja iz litijumske baterije 3.7V i ispravljaca do 5V.
Zgodan da se doda pustanje muzike preko bluetooth-a uredjaju koji ima audio ulaz, recimo razne muzike za kola itd. .


Port Description:

1. + 5 V power supply: connect the positive pole of the power supply, the voltage range is 4.1 V 5 V, make sure the power supply is within this range. Exceeding this range can damage the module or cause the work to be abnormal;

2, ground: GDN is connected to the negative post of the power supply, which is also the floor of the audio. This place must be separated from the floor and audio floor separately.

3. left channel: connects the input of the left channel of the power amplifier board or the left channel of the receiver. It is recommended to connect a capacitor to the output port (depending on the input that matches the power amplifier);

4. right channel: connects the input of the right channel of the power amplifier board or the right channel of the handset. It is recommended to connect a capacitor to the output port (depending on the corresponding input of the power amplifier);

5, silent output port: the port is pre-set to a high level, when the silence, the port emits a low level;

6. status indicator: when the Bluetooth is not connected, the light flashes quickly, and once the Bluetooth connection is successful, it will blink slowly;

7. reserved port: the port has been booted up to 5 V. When the port is activated by a low level, it turns off. When the port returns to the low level again.

Note: from the Bluetooth audio module to the power supply or the audio interface, use the welding method, do not use the way to plug in, the contact resistance will introduce noise.

Precautions:

1. Power supply: the Bluetooth audio module is a circuit sensitive to high frequency interference. It is recommended to use a linear regulated power supply. If a DC-DC power supply is used, add an LC filter to reduce the harmonic interference of the power supply, especially the switch as the charger of the mobile phone. Power supply, the ripple of the power supply may cause Bluetooth to not connect properly, and this type of 5 V output often ranges between 5.1 V and 5.4 V;

When using a switching power supply as a mobile phone adapter, add this power supply circuit, you can not add the inductance.

2 ground connection: Since the audio signal is sensitive to the interference caused by the grounding point, two grounding knots can be soldered on the output pin of the Bluetooth module, one is connected to the negative post (GND) of the power supply, and the other is connected to the power amplifier board. Audio input, try to solder on the circuit board, do not use lead wire connection (sensitive to interference), and it is recommended to test the connection point to minimize interference;

3, antenna interference: the Bluetooth antenna is extremely sensitive to high frequency or strong electromagnetic signal interference, relatively far from the strong signal of the power amplifier board, and the antenna can not be close to the objects metallic, to maintain a certain distance;

4, outer shield: The metal casing because it has a shielding effect on the Bluetooth signal, can attenuate The Bluetooth signal to cause poor reception, keep the corresponding aperture, or exposed

Note: For some power amplifier boards that are sensitive to interference and interference are not easy to operate, separate the power supply. And the Bluetooth module provides power to the end.

COMMON PROBLEM OF:

1, current sound:

The cause is due to interference on the ground. It is recommended that the output terminals of the Bluetooth module do not have to be soldered to the output terminals of the plug-in. In particular, the ground wire must be soldered, and the line must not be too long. The shorter, the better, the thicker. On the ground wire extracted from the Bluetooth module, the power floor and the audio floor must also be separated, and it is not possible to connect only one ground wire. The problem of the audio grounding at the grounding point of the power amplifier board must be connected to the ground of the audio input of the power amplifier. This grounding point can be soldered in different positions to achieve the lowest current sound. The separate power supply is a better way to resolve this current sound.

2. The Bluetooth signal is weak:

When the module works normally, the Bluetooth indicator light flashes normally. The Bluetooth reception distance is very close, can not exceed 5 meters. Generally, there is interference in the power supply (interference in the power supply).