Feature:
1. M18: MUTE mute control terminal: used to control the power amplifier board. When muting, MUTE outputs a high level of 3.3V, and outputs a low level during playback. KEY button control: This function requires additional connection of resistors and buttons to achieve Volume power off function: The default output is 100percent volume. Press the button to control the volume increase and decrease. If the control volume is less than 15percent , the volume output will be 15percent after power?on; if the control volume is greater than 15percent , the original volume will remain unchanged after power?on.
2. M28: Power supply: It can be directly powered by the MICRO USB for Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. Audio output: The earphone can be directly connected to the 3.5mm audio interface, or it can be wired for the audio input of the power amplifier board.
3. M38 Power supply: It can be directly powered by the MICRO USB for Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. The maximum working current is 5V2A. It is recommended to use 5V2A regulated power supply for better sound quality. Support USB sound card, free drive (plug and play) Connect the module to the computer with the USB cable, and the computer can play music through the module amplifier output.
4. For Bluetooth V4.2 version of for Bluetooth automatic technology, supports WAV WMA FLAC APE MP3 lossless decoding, stereo twochannel output
5. After powering on the module, the phone searches for the for Bluetooth name MH?M18 MH?M28 MH?M38, and can play music when connected to for Bluetooth.
6. Widely used in various for Bluetooth audio receivers, DIY conversion of various sounds, etc.
Specification:
Item Type: Module
Function model
M18
M28
M38
MICRO power supply
No
Yes
Yes
Audio headphone Interface
No
Yes
No
Builtin amplifier
No
No
Yes(5W+5W)
Lithium battery powered
Yes
Yes
Yes
Support USB sound card, free drive
No
No
Yes
Volume memoryadjustment
Yes
No
No
MUTE mute interface
Yes
No
No
Button extension
Yes
No
No
for Bluetooth version
For Bluetooch V4.2
Support for Bluetooth protocol
HFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2, AVDTPV1.2
Format support
Support WAVWMAFLACAPEMP3 undecoded, stereo twochannel output
Operating Voltage
5V3.7V4.2V
Not connected Broadcast state
5.5MA
Connection work state
20MA
Deep sleeping
3UA
Transmission distance
20 meters (empty or low interference environment)
Operating temperature
40C to +85 degrees C
Sensitivity
87dbm
MHM18:.
Number
Pin
Description
1
KEY
Button control terminal (4 button functions, additional resistance required)
2
MUTE
Mute control terminal (output high level 3.3V when muting, output low level during playback)
3
VCC
Positive power supply 5V (lithium battery 3.7V power supply requires short circuit diode)
4
GND
Negative power supply
5
L
Left channel output
6
R
Right channel output
MHM28:
Number
Pin
Description
1
5V
Power positive 5V
2
GND
Negative power supply
3
VBAT
Lithium battery positive 3.74.2V
4
L
Left channel output
5
R
Right channel output
6
AGND
Audio ground
MHM38:
Number
Pin
Description
1
5V
Power positive 5V
2
GND
Negative power supply
3
VBAT
Lithium battery positive 3.74.2V
4
L+L
Left channel output (direct speaker)
5
R+R
Right channel output (direct speaker)
Blue Module:
The light blinks when for Bluetooth is not connected
The indicator light usually lights up when for Bluetooth is connected
For Bluetooth appears during playback, slow flashing
Package List:
1 x ModuleM18: MUTE mute control terminal: used to control the power amplifier board. When muting, MUTE outputs a high level of 3.3V, and outputs a low level during playback. KEY button control: This function requires additional connection of resistors and buttons
M28: Power supply: It can be directly powered by the MICRO USB for Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. Audio output: The earphone can be directly connected to the 3.5mm audio interface, or it can be wi
M38 Power supply: It can be directly powered by the MICRO USB for Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. The maximum working current is 5V2A. It is recommended to use 5V2A regulated power supply for bette
For Bluetooth V4.2 version of for Bluetooth automatic technology, supports WAV WMA FLAC APE MP3 lossless decoding, stereo twochannel output
After powering on the module, the phone searches for the for Bluetooth name MH?M18 MH?M28 MH?M38, and can play music when connected to for Bluetooth.
