MH-M38 Wireless Bluetooth Audio Receiver Module w/ Cable

Power the module via its 3.3V-5V input pins or USB port. The blue LED will flash rapidly, indicating it's in pairing mode. On your phone, enable Bluetooth and scan for devices. Select "MH-M38" from the list to pair. Once connected, the LED will stay solid, and you can start streaming audio from any media app. The module supports automatic reconnection on subsequent power-ups.

The module operates from a 3.3V to 5V DC supply, typically drawing around 20mA during active audio playback. To conserve battery power, it features a deep sleep mode that reduces current consumption to just 3 microamps when audio streaming is inactive. Ensure your power source can provide stable voltage, and consider using a low-quiescent current LDO regulator for optimal efficiency in portable designs.

The module's integrated decoder supports a range of audio formats including lossless WAV, FLAC, APE, and compressed WMA and MP3 files. It provides a stereo dual-channel analog audio output via its left (L) and right (R) pins. You should connect these outputs directly to the input of an external audio amplifier or powered speaker system using shielded audio cable for best signal quality and to minimize noise.

Yes, with its industrial operating temperature range of -40°C to +85°C, the module is suitable for outdoor or harsh environment use. The specified 20-meter range is achievable in an open, line-of-sight environment with minimal RF interference. For reliable performance through walls or in cluttered spaces, expect a reduced effective range. Using an external antenna (if supported by your specific IC variant) could potentially improve signal strength.

Yes. The seller notes that modules may ship with different but functionally equivalent IC variants, including MH-M38, HX M38, Hw-406, or JL AS208PO1429-25C4. All variants are confirmed to provide identical core functionality: Bluetooth 4.2 connectivity, lossless audio decoding, stereo output, and the same pinout and electrical specifications. No changes to your wiring or code are required regardless of the specific chip label received.