| Parameter | Value | |-----------|-------| | | 2.0 + EDR or 2.1 + EDR (backward compatible with 1.2) | | Frequency Band | 2.4 GHz ISM (2402–2480 MHz) | | Modulation | GFSK (Gaussian Frequency Shift Keying) | | RF Power (Class 2) | -6 dBm to +4 dBm (typical 0 dBm) | | Receive Sensitivity | -80 dBm to -85 dBm (depending on vendor) | | Data Rate (UART) | 9600 bps to 1.3824 Mbps (default 9600, 8N1) | | Air Data Rate | Up to 2.1 Mbps (EDR) | | Operating Voltage | 3.0V – 3.6V (absolute max 3.9V, not 5V tolerant) | | Current Consumption | Tx: ~30 mA, Rx: ~25 mA, Standby: < 1 mA (Deep sleep: < 10 µA for BLE variant) | | Interface | UART (TX, RX, RTS, CTS optional), GPIO, State LED | | Antenna | On-board PCB trace antenna (gain ~1 dBi) | | Range (LOS) | 10 meters (typical indoor), up to 20 meters (open field) | | Form Factor | 27 mm x 13 mm x 2.5 mm (typical) | | Pin Pitch | 2.54 mm (compatible with breadboards and 0.1" headers) |
Measuring only a few millimeters in width and length, the ultra-small footprint allows it to fit inside tight enclosures. It can easily retrofitted into vintage radios, headphones, or compact car audio dashboards. 3. Power Supply Flexibility
If the identifier BL12-A3 does not appear in your phone's device list, the receiver is likely trapped in an active session with a different device in your household. Bluetooth Low Energy Certified SoCs and Modules
The fixture will emit a distinct confirmation sound or tone. This indicates that the encrypted handshake is complete and audio routing has transferred over successfully. Key Performance Strengths bl12a3 bluetooth full
BL12A3 Bluetooth Full Guide: Features, Performance, and User Experience
What are you planning to connect this module to?
Why does the BL12A3 remain relevant? The answer lies in its balance. While newer chips like Qualcomm’s aptX HD modules offer ultra-high-definition audio, they are expensive. The BL12A3 occupies the "sweet spot" of the market. It offers a robust, error-corrected connection that is "good enough" for 95% of listeners at a fraction of the cost. | Parameter | Value | |-----------|-------| | | 2
Because these units are permanently installed within home walls or heavy furniture, they run on continuous electrical inputs. This bypasses the power-throttling issues common in low-voltage, battery-powered portable speakers. Step-by-Step Device Pairing Guide
The is a Bluetooth audio receiver module frequently integrated into smart home accessories, most notably LED bathroom mirrors with built-in speakers. Core Functionality
In bathroom mirror applications, the associated hardware often carries an IP44 rating for protection against splashes. Usage in Smart Mirrors Power Supply Flexibility If the identifier BL12-A3 does
If you cannot find the device or find that audio drops out, follow these standard hardware fixes: Device Disappeared from Bluetooth Scanning Menu
Ensure the host fixture (such as your LED mirror or smart vanity) is wired to a live power source.