MartinFowler

Bluetooth power amplifier audio based on NS4251AB/D class power amplifier chip expansion

Overview

Battery management part:
A multi-functional power management SOC using IP5306 voltage-to-voltage conversion, lithium battery charging management, and battery power indication. The conversion efficiency is as high as 92%. It can be expanded according to the simplified application provided in the data sheet. It can be powered by common Micro-B female sockets and type interfaces, or it can be powered by lithium batteries, making it easy to carry. The battery input range is 3.7V-4.2V.
-------------------------------------------------- -------------------------------------------------- ----------------------------------------
Update log: 2022/6/29, add dialing code The switch seat, battery rest base, and Bluetooth part seat can be facing inward, and you can see the LED covered by Bluetooth.
-------------------------------------------------- -------------------------------------------------- -----------------------------------------------

Bluetooth module and audio input part:
using MH-M18 Bluetooth The module supports the latest Bluetooth 4.2 transmission and two-channel stereo lossless playback. After the module is connected to Bluetooth, Bluetooth wireless transmission can be quickly realized, which is very convenient. In an open environment, the Bluetooth connection distance can reach 20 meters.
Bluetooth V4.2 version, supports Bluetooth automatic reconnection technology, supports WAV/WMA/FLAC/APE/MP3 lossless decoding, and stereo two-channel output.
After the module is powered on, the mobile phone searches for the Bluetooth name MH-M18/MH-M28/MH-M38, and music can be played after connecting to Bluetooth;
module blue indicator light:
when Bluetooth is not connected, the indicator light flashes quickly;
Bluetooth is connected When Bluetooth is playing, the indicator light is always on;
when Bluetooth is playing, the indicator light flashes slowly.
Pin diagram:
Main control part:
Add a few capacitors to the audio input and Bluetooth input to filter interference to make the sound quality cleaner.
What you need to pay attention to are the several working modes of the main control chip:
Status indicator light part:
You can switch the working mode by referring to the data manual, and read the data manual carefully.

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

Hot

Technical Resources More

Search Datasheet?

Supported by EEWorld Datasheet

Technical Videos More

Forum More

Update:2025-06-19 03:00:31

A collection of outstanding works from the National Electronic Design Competition???
Which book or website has a collection of outstanding works from the National Electronic Design Competition in recent years? ? ?
Kewei PLC chipset development example (Part 2)
If you want to do your work well, you must first sharpen your tools. What tools do you need to develop Kewei PLC chipsets? Don't worry, I'll tell you one by one: 1. KEIL2 or KEIL3, this is necessary.
A strong man's experience in e-sports competitions
[i=s]This post was last edited by paulhyde on 2014-9-15 09:42[/i]This is a great experience introduction to the competition that is worth learning from! It will help you avoid detours!!
[Transfer] The difference between push-pull output and open-drain output
Push-Pull output is generally referred to as push-pull output. It should be more suitable than CMOS output in CMOS circuits because the push-pull output capacity in CMOS cannot be as large as that of
[Samples] + New experience after TI changed the interface
[i=s]This post was last edited by johnrey on 2014-12-11 23:49[/i] A word for the beginning. I have participated in two rounds of Ti sample events, and gradually stopped applying for the event. In fact
What is the difference between computer organization principles and computer architecture?
I have already learned the principles of computer organization, and next semester I will take the course of computer architecture. I wonder how big the difference is between the two? Can you give me s

Datasheet More

Circuits More