Product introduction:
MH-M18 / M28 / M38 is a low-power Bluetooth design solution that supports the latest Bluetooth 4.2 transmission, two-channel stereo lossless playback, and Bluetooth wireless transmission when the module is connected to Bluetooth, which is very convenient , In an open environment, the Bluetooth connection distance can be up to 20 meters.
Widely used in a variety of Bluetooth audio reception, a variety of audio DIY change.
Function:
1. bluetooth V4.2 version, support Bluetooth automatic connection technology, support WAV / WMA / FLAC / APE / MP3 lossless decoding, stereo dual channel output.
2. After the module is powered on, the cell phone searches for the Bluetooth name MH-M18 / MH-M28 / MH-M38, and can play music after connecting Bluetooth.
3. Module blue indicator:
When Bluetooth is not connected, the indicator flashes quickly; when Bluetooth is connected, the indicator is always on; when Bluetooth is playing, the indicator blinks slowly
MH-M18
Pin definition:
KEY : Button control terminal (4 button functions, additional resistance required)
MUTE: Mute control terminal (output high level 3.3V when muting, output low level during playback)
VCC: Positive 5V power supply (Lithium battery 3.7V power supply requires short circuit diode)
GND: negative power supply
L: Left channel output
R: Right channel output
Feature:
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.
Volume power off function: The default output is 100% volume. Press the button to control the volume increase and decrease. If the control volume is less than 15%, the volume output will be 15% after re-powering; if the control volume is greater than 15%, the original volume will remain unchanged after power-on.
MH-M28
Pin definition:
5V: Power positive 5V
GND: Negative power supply
VBAT: Lithium battery positive 3.7-4.2V
L: Left channel output
R: Right channel output
AGND: audio ground
Feature:
Power supply: It can be directly powered by the MICRO USB Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. Note that the 5V and 3.7V power supply interfaces are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
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 (interface L/R/AGND can be directly wired).
MH-M38
Pin definition:
5V: Power positive 5V
GND: negative power supply
VBAT: Lithium battery positive 3.7-4.2V
L+/L-: Left channel output (direct speaker)
R+/R-: Right channel output (direct speaker)
Feature:
Power supply: It can be directly powered by the MICRO USB Android cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium battery. Note that the 5V and 3.7V power supply interfaces are different. 5V is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
The maximum operating current is 5V2A. It is recommended to use a regulated power supply of 5V2A 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.
Audio output: output left and right stereo audio signals, which can be connected to two 2-8 ohm, 3-5W speakers, and 4 Euro 5W speakers.
This product has its own dual 5W power amplifier circuit, and must not be connected to another amplifier! The outputs of the two amplifiers cannot be connected in parallel or the negative poles are connected together, otherwise the power amplifier chip is damage
Package Included:
1PC
Note:
1.We can offer bulk price, if you need large quantity, please feel free to send a message to consult customer service for wholesale price.
2.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.
3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!
1.All the items will be shipped within 1-3 business day by Airmail after the payment is clear.
2.If your shipping address is in United States. Then, your goods will be shipped out by Standard shipping, which tracking number will be shown on eBay. And, usually it takes 10-15 days shipping time.
3.Most times you will receive your order within 10-30 business days after we transfer your package to the delivery company. We cannot guarantee the delivery timeframe if the post office has any unexpected delays due to holiday, weather, customs, or other conditions. Some countries like Russia, Brazil, or some European countries may take up to 50 days or longer for delivery.
4.Please choose some local sellers, if you cannot wait patiently in the shipping time we declared.
5.We appreciate your patience if you haven't received items in 30 days(Russian customers may need more patience by reason of the local delivery system and/or customs). If you are concerned in any way, please feel free to contact us via ebay message instead of leaving negative/neutral feedback or opening a dispute. We will make every effort to fix any problem(resend or refund any missing item).
6.Customs duty is obligation and liability of a citizen in your country, so buyer should be responsible for any tax and custom duty incurred. Generally, the delay or failure delivery is sometimes caused by the policy of different customs. For example, Laser Pointer is unacceptable in some countries. Therefore, please double check your local customs policy carefully before purchase. Or, we will NOT be responsible for any failure delivery related destination customs issue.
1.Any problem after receiving our goods,please contact us before leaving Neutral/Negative feedback.We promise to help you solve it asap,and make you feel satisfactory absolutely.
2.Please DO NOT leave negative feedback without asking for help.
Please do not leave negative or neutral feedback if you haven't received item in 30 days, because we have mentioned the shipping time repeatedly.
