Teardown Tuesday: Bluetooth Headphones

According to some, the headphone jack is a thing of the past and the future of audio is wireless. In this Teardown Tuesday, we are going to take a look at a pair of Bluetooth headphones!

Bluetooth headphones come in all shapes and sizes, from relatively small in-ear headphones to over-ear headphones and neckband headphones like the ones in this teardown.


The Mpow Neckphones. Image courtesy of Amazon.

In this teardown, the headphones we are taking a look at are Mpow Jaws. These were purchased from Amazon for around $30 and they feature Bluetooth 4.1, a “Shark Design”, and an internal battery that can provide up to 13 hours of use.

Opening Them Up!

Opening these headphone up was pretty easy compared to some teardowns. There were two small Phillips screws that needed to be removed and the plastic shells of the neckband could be separated.

Earbuds Opened Up!
One of the ear buds opened

The earbuds, on the other hand, were a good bit more difficult to open. They were held together with several plastic clips and cyanoacrylate glue (super glue). The white residue inside of the headphones is caused by the glue. Inside of the earbuds is a small speaker and a strong neodymium magnet that holds the earbuds to the neckband.

Circuit Boards!


The Left bluetooth pcb
The left circuit board

Inside of these headphones, there are two separate circuit boards. The left circuit board controls the battery charging and power management. Underneath this left circuit board is a single-cell lithium battery.
The right circuit board contains the Bluetooth SOC and trace antenna. Both of these circuit boards are two-layer boards that have green solder mask and white silkscreen on both sides.

PCB Right Side
The right circuit board

The two circuit boards are connected through six conductors. These are multi-stranded, enamel-coated wires that pass through the back of the neck band. These wires appear to be hand-soldered to the circuit boards.

Connecting Wires
The wires connecting the PCBs

Bluetooth SOC


Bluetooth SOC
The CSR Bluetooth SOC

The Bluetooth SOC, in a QFN package, is really the star of this teardown. In these headphones, a CSR 8635 SOC is used to do pretty much everything. This SOC features the voltage regulators, the battery charger, Bluetooth radio, audio decoder, and noise cancellation.

Bluetooth antenna
The Bluetooth trace antenna 

This SOC is intended for applications just like this. This isn’t the first teardown we’ve seen CSR SOCs in—our Bluetooth radar detector and Bluetooth speaker teardowns also showcase CSR SOCs. As a note, in August of 2015, San Diego-based semiconductor company Qualcomm completed its acquisition of CSR.

the serial flash
The flash memory

One of the few peripherals that are not built into the SOC is the flash memory. The flash memory is located on the bottom of the PCB. The flash IC used in this is a 512kBit serial flash made by Macronix, part number KH25U5121E.

Battery


Li-Ion Battery
The Li-Ion battery

There is a single-cell Li-Ion battery that is attached to one of the PCBs by double sided tape. The battery measures 30.0mm by 11.1mm and is 5.3mm thick. There is a small protection circuit board that is attached to the top of the battery cell. The battery is connected through two small-diameter wires that are hand-soldered to the circuit board.

Input/Outputs


The Microphone
The 4mm microphone

There are quite a few user IOs on these headphones. There are the small speakers like one would expect. In addition, there are two small 0603-sized status LEDs, a microphone, four tactile buttons, and a small slide switch. Also, it appears that there is a location and the supporting electronics for a pancake-style vibration motor that isn’t included with this particular version of the headphones.

The slide switch
The power slide switch

Wrapping it Up



The Jabra BT620s. Image courtesy of Amazon.

Technology is getting smaller and smaller. Original Bluetooth headphones, such as the Jabra BT620s shown above) were substantially larger than these. Recently, Apple has announced their new Air Pods that take this functionality and make it substantially smaller.
Are Bluetooth headphones the future? Some manufacturers think so!

A diagram of Apple’s Airpods from the Keynote. Image courtesy of Apple.

Thanks for taking a look at this Teardown Tuesday! Stop by next week for another teardown!

Previous
Next Post »
My photo

Hi, I`m Sostenes, Electrical Technician and PLC`S Programmer.
Everyday I`m exploring the world of Electrical to find better solution for Automation. I believe everyday can become a Electrician with the right learning materials.
My goal with BLOG is to help you learn Electrical.
Related Posts Plugin for WordPress, Blogger...

Label

KITAIFA NEWS KIMATAIFA MICHEZO BURUDANI SIASA TECHNICAL ARTICLES f HAPA KAZI TU. LEKULE TV EDITORIALS ARTICLES DC DIGITAL ROBOTICS SEMICONDUCTORS MAKALA GENERATOR GALLERY AC EXPERIMENTS MANUFACTURING-ENGINEERING MAGAZETI REFERENCE IOT FUNDAMENTAL OF ELECTRICITY ELECTRONICS ELECTRICAL ENGINEER MEASUREMENT VIDEO ZANZIBAR YETU TRANSDUCER & SENSOR MITINDO ARDUINO RENEWABLE ENERGY AUTOMOBILE SYNCHRONOUS GENERATOR ELECTRICAL DISTRIBUTION CABLES DIGITAL ELECTRONICS AUTOMOTIVE PROTECTION SOLAR TEARDOWN DIODE AND CIRCUITS BASIC ELECTRICAL ELECTRONICS MOTOR SWITCHES CIRCUIT BREAKERS MICROCONTROLLER CIRCUITS THEORY PANEL BUILDING ELECTRONICS DEVICES MIRACLES SWITCHGEAR ANALOG MOBILE DEVICES CAMERA TECHNOLOGY GENERATION WEARABLES BATTERIES COMMUNICATION FREE CIRCUITS INDUSTRIAL AUTOMATION SPECIAL MACHINES ELECTRICAL SAFETY ENERGY EFFIDIENCY-BUILDING DRONE NUCLEAR ENERGY CONTROL SYSTEM FILTER`S SMATRPHONE BIOGAS POWER TANZIA BELT CONVEYOR MATERIAL HANDLING RELAY ELECTRICAL INSTRUMENTS PLC`S TRANSFORMER AC CIRCUITS CIRCUIT SCHEMATIC SYMBOLS DDISCRETE SEMICONDUCTOR CIRCUITS WIND POWER C.B DEVICES DC CIRCUITS DIODES AND RECTIFIERS FUSE SPECIAL TRANSFORMER THERMAL POWER PLANT cartoon CELL CHEMISTRY EARTHING SYSTEM ELECTRIC LAMP ENERGY SOURCE FUNDAMENTAL OF ELECTRICITY 2 BIPOLAR JUNCTION TRANSISTOR 555 TIMER CIRCUITS AUTOCAD C PROGRAMMING HYDRO POWER LOGIC GATES OPERATIONAL AMPLIFIER`S SOLID-STATE DEVICE THEORRY DEFECE & MILITARY FLUORESCENT LAMP HOME AUTOMATION INDUSTRIAL ROBOTICS ANDROID COMPUTER ELECTRICAL DRIVES GROUNDING SYSTEM BLUETOOTH CALCULUS REFERENCE DC METERING CIRCUITS DC NETWORK ANALYSIS ELECTRICAL SAFETY TIPS ELECTRICIAN SCHOOL ELECTRON TUBES FUNDAMENTAL OF ELECTRICITY 1 INDUCTION MACHINES INSULATIONS ALGEBRA REFERENCE HMI[Human Interface Machines] INDUCTION MOTOR KARNAUGH MAPPING USEUL EQUIATIONS AND CONVERSION FACTOR ANALOG INTEGRATED CIRCUITS BASIC CONCEPTS AND TEST EQUIPMENTS DIGITAL COMMUNICATION DIGITAL-ANALOG CONVERSION ELECTRICAL SOFTWARE GAS TURBINE ILLUMINATION OHM`S LAW POWER ELECTRONICS THYRISTOR USB AUDIO BOOLEAN ALGEBRA DIGITAL INTEGRATED CIRCUITS FUNDAMENTAL OF ELECTRICITY 3 PHYSICS OF CONDUCTORS AND INSULATORS SPECIAL MOTOR STEAM POWER PLANTS TESTING TRANSMISION LINE C-BISCUIT CAPACITORS COMBINATION LOGIC FUNCTION COMPLEX NUMBERS ELECTRICAL LAWS HMI[HUMANI INTERFACE MACHINES INVERTER LADDER DIAGRAM MULTIVIBRATORS RC AND L/R TIME CONSTANTS SCADA SERIES AND PARALLEL CIRCUITS USING THE SPICE CIRCUIT SIMULATION PROGRAM AMPLIFIERS AND ACTIVE DEVICES BASIC CONCEPTS OF ELECTRICITY CONDUCTOR AND INSULATORS TABLES CONDUITS FITTING AND SUPPORTS CONTROL MOTION ELECTRICAL INSTRUMENTATION SIGNALS ELECTRICAL TOOLS INDUCTORS LiDAR MAGNETISM AND ELECTROMAGNETISM PLYPHASE AC CIRCUITS RECLOSER SAFE LIVING WITH GAS AND LPG SAFETY CLOTHING STEPPER MOTOR SYNCHRONOUS MOTOR AC METRING CIRCUITS APPS & SOFTWARE BASIC AC THEORY BECOME AN ELECTRICIAN BINARY ARITHMETIC BUSHING DIGITAL STORAGE MEMROY ELECTRICIAN JOBS HEAT ENGINES HOME THEATER INPECTIONS LIGHT SABER MOSFET NUMERATION SYSTEM POWER FACTORS REACTANCE AND IMPEDANCE INDUCTIVE RESONANCE SCIENTIFIC NOTATION AND METRIC PREFIXES SULFURIC ACID TROUBLESHOOTING TROUBLESHOOTING-THEORY & PRACTICE 12C BUS APPLE BATTERIES AND POWER SYSTEMS ELECTROMECHANICAL RELAYS ENERGY EFFICIENCY-LIGHT INDUSTRIAL SAFETY EQUIPMENTS MEGGER MXED-FREQUENCY AC SIGNALS PRINCIPLE OF DIGITAL COMPUTING QUESTIONS REACTANCE AND IMPEDANCE-CAPATIVE RECTIFIER AND CONVERTERS SEQUENTIAL CIRCUITS SERRIES-PARALLEL COMBINATION CIRCUITS SHIFT REGISTERS BUILDING SERVICES COMPRESSOR CRANES DC MOTOR DRIVES DIVIDER CIRCUIT AND KIRCHHOFF`S LAW ELECTRICAL DISTRIBUTION EQUIPMENTS 1 ELECTRICAL DISTRIBUTION EQUIPMENTS B ELECTRICAL TOOL KIT ELECTRICIAN JOB DESCRIPTION LAPTOP THERMOCOUPLE TRIGONOMENTRY REFERENCE UART WIRELESS BIOMASS CONTACTOR ELECTRIC ILLUMINATION ELECTRICAL SAFETY TRAINING FILTER DESIGN HARDWARE INDUSTRIAL DRIVES JUNCTION FIELD-EFFECT TRANSISTORS NASA NUCLEAR POWER SCIENCE VALVE WWE oscilloscope 3D TECHNOLOGIES COLOR CODES ELECTRIC TRACTION FEATURED FLEXIBLE ELECTRONICS FLUKE GEARMOTORS INTRODUCTION LASSER MATERIAL PID PUMP SEAL ELECTRICIAN CAREER ELECTRICITY SUPPLY AND DISTRIBUTION MUSIC NEUTRAL PERIODIC TABLES OF THE ELEMENTS POLYPHASE AC CIRCUITS PROJECTS REATORS SATELLITE STAR DELTA VIBRATION WATERPROOF