Bluetooth 4.0 Stereo Audio Receiver

Product detailed description

Bluetooth 4.0 Stereo Audio Receiver

Bluetooth module for audio transmission. LED to series with resistance: fast blinking - not connected, slow blinking - connected.

Specifications:

• Working voltage 5V
• Range: approx. 10m
• Audio output
• Mute output
• Dimensions: 30x20mm

Included in delivery:

• 1pc Bluetooth 4.0 Stereo Audio Receiver

Remark:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustration purposes only and may sometimes differ from the actual appearance of the item. However, this does not change its basic properties.

Documentation:

1. Description of individual pins
   • +5V power supply. Connect to the positive pole of the power supply, the voltage range for the 5V version is 4.2~5.1V. Exceeding this range may damage the module.
   • GDN: ground (0V).
   • Left channel output: if the module is not used in a specific application with an amplifier where the input is already galvanically isolated, it is recommended to use a decoupling capacitor (C>1µF).
   • Right channel output: see left channel.
   • Mute (option): output for controlling the final amplifier.
   • Status indicator (LED): indicates the three states of the BT adapter. When no device is connected, it flashes quickly (~0.5s). The connected device is indicated by a slow blink (~1s) if audio is being transmitted, or by a steady glow if transmission is inactive (in this state the MUTE output signal is also displayed).
   • RESET: a short connection to ground causes the module to reset.
2. Typical system wiring diagram: <
3. Other recommendations:
   • The module power supply is sensitive to high frequency interference, it is recommended to use a linear voltage regulator (e.g. 78L05) supplemented with blocking capacitors. If you use a DC/DC or AC/DC converter, add an LC filter (especially if you use a mobile phone charger etc.). Power interference can cause incorrect Bluetooth connections. If the power supply voltage of the mobile phone USB charger exceeds 5.1V or you are not sure, use an additional protection diode (any Si type).
   • Earthing: if there is interference during connection or transmission of sound, it is necessary to check the earthing conductors or choose a single-point earthing connection. Attention should also be paid to the connection connector, choose a suitable type of precision connector or solder directly to the board (or to individual pins).
   • BT antenna placement: the Bluetooth antenna is sensitive to RF frequencies or strong electromagnetic fields. If possible, place the module as far away from the amplifier board, switching power supply, and do not place it near metal enclosures or heat sinks.
   • Enclosure, covering: since the metal enclosure shell is an effective shielding of the Bluetooth signal, the metal enclosure may attenuate the Bluetooth signal so much that it may not be possible to establish a connection (find this device on your mobile phone or other signal source). This must be taken into account when using the BT module.
   • Status indicator LED wiring: since the current carrying capacity of this output is low, it is recommended to use a red LED supplemented with a 100? resistor for direct connection, or supplement the output with a transistor (NPN).