HiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT

HiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT

$5

HiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT

HiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT:our focus is to provide you with the ultimate experience through exceptional service. *TLDR great product, if you plan to use a 3.7v battery read last paragraph!Bought this to add Bluetooth to a very nice older portable speaker. Works great but I ended up destroying one of the boards because of the lack of documentation. There is no standalone documentation available and the images on here and other online listings do not show which resistor to remove. I made the unfortunate mistake of removing a wrong one and fried one of my boards. Sound quality is very good, not perfect. Very strong Bluetooth connection! Was able to move it across my apartment (about 30ft + 4 walls) with little to no loss of connection.***For anyone who is looking to run this off of a 3.7v battery, you must remove the SMD resistor that is just behind the "Key" wire connection. If you do not, it will power on just fine but make an annoying sound every 10 seconds that completely interrupts the audio. If you plan to run this on a 5v power supply then do NOT make any changes, it will work fine out of the box.al sold out.,overseas,popularHiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT
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Product description

This product M18/M28/M38 is a low-power Bluetooth design solution, supports the latest Bluetooth 4.2 transmission, 2-channel stereo lossless playback, and the module can be connected to Bluetooth to quickly realize Bluetooth wireless transmission, which is very convenient.
In an open environment, the Bluetooth connection distance can reach 20 meters. Widely used in a variety of Bluetooth audio reception, a variety of audio DIY modification.

Function Description:
Bluetooth V4.2 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual channel output.
After the module is powered on, the mobile phone searches for the Bluetooth name M18/M28/M38, and can play music after connecting Bluetooth.
Module blue indicator light:
When the Bluetooth is not connected, the indicator light flashes quickly;
When the Bluetooth connection is on, the indicator light is always on;
When the Bluetooth is playing, the indicator light flashes slowly.

M18(HW-425):

PIN-------Description
KEY------Button control terminal (4 button functions, additional resistors such as wiring diagram)
MUTE---Mute control terminal (output high level 3.3V when muting, output low level during playback)
VCC-----Positive power supply 5V (lithium battery 3.7V power supply requires short circuit diode)
GND-----GND
L-----------Left channel
R----------Right channel
--------------------------------------------------------------------------------------------------------------------------
Package Includes:
3 * M18(HW-425) Wireless Bluetooth MP3 Audio Receiver Board

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HiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT

HiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT:our focus is to provide you with the ultimate experience through exceptional service. *TLDR great product, if you plan to use a 3.7v battery read last paragraph!Bought this to add Bluetooth to a very nice older portable speaker. Works great but I ended up destroying one of the boards because of the lack of documentation. There is no standalone documentation available and the images on here and other online listings do not show which resistor to remove. I made the unfortunate mistake of removing a wrong one and fried one of my boards. Sound quality is very good, not perfect. Very strong Bluetooth connection! Was able to move it across my apartment (about 30ft + 4 walls) with little to no loss of connection.***For anyone who is looking to run this off of a 3.7v battery, you must remove the SMD resistor that is just behind the "Key" wire connection. If you do not, it will power on just fine but make an annoying sound every 10 seconds that completely interrupts the audio. If you plan to run this on a 5v power supply then do NOT make any changes, it will work fine out of the box.al sold out.,overseas,popularHiLetgo 3pcs M18 Wireless Bluetooth MP3 Audio Receiver Board BLT