MONSTER is a company established in 1979, dedicated to developing and designing creative products to enhance the sound quality of music. MONSTER has developed the famous Beats by Dr. Dre headphone sound and has become the world’s leading manufacturer of high-performance, high-quality headphones. After the “Beats” brand, it is committed to developing more “MONSTER” brand headphones to create more perfect music sound products.
MONSTER CLARITY 8.0 ANC true wireless earphones is one of its flagship products that focus on active noise cancelling. It supports adaptive hybrid ANC function and transparency mode, and supports neural network AI call noise cancelling. Built-in 10mm high-quality titanium film + PU composite diaphragm, support Bluetooth 5.2, with pure MONSTER sound. Support Qi wireless charging and fast charging. The earphone can last up to 10 hours a single time, and the comprehensive battery life has reached an extra-long 40 hours. Let’s take a closer look at the exterior design and internal structure of this product.
|1. MONSTER CLARITY 8.0 ANC charging case teardown
MONSTER CLARITY 8.0 ANC true wireless earphones not only have their own unique design in appearance, but also have high texture performance. Enter the teardown section below to see the internal structural design and configuration information.
Pry open the snap-on charging case cockpit. The small power input board in the cavity is connected to the main board through wires, a battery is arranged at the bottom, and a wireless charging receiving coil is attached.
Remove the screws and remove the main board at the bottom of the cockpit. There are multiple magnets at the bottom of the cockpit to attract the charging case cover and earbuds.
Take out the main components in the charging case.
The inner structure of the back cover of the charging case.
Type-C power input interface female socket.
The wireless charging receiving coil is arranged on the magnetic shielding sticker, and is fixed on the charging case shell by double-sided tape.
Lithium-ion battery model in the charging case: HSZ901635, rated voltage: 3.7V, rated capacity: 470mAh/1.739Wh.
The battery is equipped with a circuit protection board, which is equipped with G3JP lithium battery protection and 8205A MOS tube.
The front circuit of the charging case motherboard.
The circuit on the back of the charging case motherboard.
Maxic MT5705 wireless charging receiver chip, supports Qi protocol. Using embedded ARM Cortex M0 processor, 2KB SRAM, 8KB OTP, fully compliant with BPP’s latest WPC Qi specification (version 1.2.4). It can provide a maximum output power of 5W, support an output voltage of 5V and a maximum current of 1A, and the AC to DC conversion efficiency is up to 90%.
The high efficiency of MT5705 ensures its low temperature rise and heat generation, and the wide FOD setting range makes it easy to pass the BPP certification of WPC. MT5705 also has a complete overvoltage, overcurrent and overtemperature protection mechanism. Using QFN32 package (4 x 4mm), it is especially suitable for various low-power smart devices such as TWS earphone charging compartment.
An unmarked MCU.
TPS SY8815 bluetooth headset charging bin solution. The charging module and the discharging module are integrated inside, and the charging current can be adjusted externally; the discharging module integrates two output current limit switches, which provides independent load presence detection and load insertion detection, and supports output current detection at the same time.
SY8815 supports discharge enable control, MCU can flexibly control the discharge function of the chip directly through EN. SY8815 integrates a single-line status code output, which is convenient for the chip to report the chip status to the MCU. SY8815 is very suitable for the design of the bluetooth headset charging box, which greatly simplifies the peripheral circuits and components, and provides an easy-to-use solution for the application of the bluetooth headset charging case.
According to 52audio, the power management chip of TPS has been adopted by Xiaomi, OPPO, OnePlus, realme, 1MORE, Edifier, JBL, HARMAN, Lenovo and other brands.
2R2 boost inductor, with TPS SY8815 internal synchronous boost circuit, boost the battery to charge the earphone.
TPS SY5320 over-voltage and over-current protection IC is a highly integrated IC with input under-voltage and over-voltage protection, battery over-voltage protection, abnormal load current protection and over-temperature protection, etc. It can withstand abnormal input up to 28V Voltage, used in the front end of the charging circuit or low voltage system to protect the lithium battery or low voltage system from abnormal input faults.
The function buttons on the motherboard are used for bluetooth pairing connection.
The pogo pin connector for charging the earphones.
|2. MONSTER CLARITY 8.0 ANC earbuds teardown
Pry open the earphone cavity along the parting line.
A battery unit is fixed inside the rear cavity.
The internal structure of the front cavity, the speaker is provided with a large number of glue seals, and the magnet is fixed on the cavity wall through glue to absorb the charging case cockpit.
Take out the battery, connect the speaker and battery wires to the FPC cable, and then connect to the motherboard inside the headphone handle.
Pry open the back panel of the earphone handle, the internal structure of the cavity. The microphones at both ends are provided with an acoustic sealing structure to improve the radio performance. The cable extending inside the headphone head is connected to the motherboard through the BTB connector.
The inside of the earphone handle cover is affixed with an FPC bluetooth antenna and a touch detection patch.
Pick up the BTB connector, remove the motherboard, and the internal structure of the cavity.
Take out the speaker and microphone inside the front cavity, and the internal structure of the front cavity.
The internal component circuit of the headphone head, including battery, speaker and feedback noise cancelling microphone circuit.
The BTB connector male socket at the end of the cable is used to connect to the motherboard.
A lithium battery protection IC with silkscreen 1WB3 is set on the cable.
The speaker is provided with a metal cover.
The front of the dynamic driver inside the earphone.
The back of the dynamic driver inside the earphone.
After actual measurement, the size of the speaker is about 10mm, which is consistent with the official promotion.
Laser carving IA29I 2117’s MEMS back-feed noise cancelling microphone is used to pick up the noise inside the ear canal.
The inside of the earphone uses a steel shell button battery, model: LIR1054, rated voltage: 3.6V, from LIYUAN.
The circuit on the side of the headphone motherboard.
The circuit on the other side of the headphone motherboard.
WUQI WQ7033A bluetooth audio SoC, WQ7033 series supports Bluetooth 5.2 dual-mode, supports the new generation of bluetooth audio technology standard LE Audio. Integrated high-performance dual RISC-V CPU, HiFi 5 DSP and NPU, ultra-low power consumption design provides the earphone with 10 hours of long-lasting battery life.
In other functions, WQ7033A supports FF+FB hybrid ANCactive noise cancelling function and transparent mode. Support multi-Mic hybrid noise cancelling, AI NN network intelligent call noise cancelling, can achieve high-definition call experience in complex environments. Support VAD voice wake-up. It also has rich interfaces, integrated charging management system, etc.
WUQI WQ7033A system and software architecture diagram.
Two Scientific SDHL1608F4R7MT fully magnetic shielded precision wire wound inductors are one of the SDHL1608 series. Inductance value: 4.7μH±20%, DC resistance: 700mΩ±10%, saturation current: 450mA, temperature rise current: 400mA, used to power the internal circuit of the bluetooth chip.
SDHL series precision wire wound inductors adopt a fully magnetic shielding structure to reduce radiation and interference to the surrounding area, and can optimize the noise floor and pop sound of TWS earphones. The copper wire is wrapped. In special cases, when the inductive whistle occurs, the wrapping layer can suppress the vibration of the copper wire, thereby optimizing the inductive whistling phenomenon.
The shielding layer of SDHL series precision wire wound inductors is made of materials with enhanced magnetic permeability, which enhances the performance of the inductors, and at the same time tightens the magnetic lines of force, so that the bottom of the inductors can be routed. There is no exposed copper wire at the bottom, which can avoid high-temperature solder paste sputtering in the process of patch production, thereby improving the quality control of batch products.
According to 52audio, Scientic responded to three models and dozens of high-quality inductor products launched in the TWS earphone market. At present, TWS earphone products such as OnePlus Buds Z2 true wireless earphones, QCY T17 true wireless earphones, and LOOP-T6 smart earphones have adopted Scientific full magnetic shielding precision winding inductors.
The 16.000MHZ crystal oscillator provides the clock for the bluetooth chip.
Connect the metal copper column of the charging case to charge the earphone, and a sponge pad is attached to the bottom to seal.
Laser engraving ID05I 2217 MEMS microphone, used for voice call pickup.
Pogo Pin connector for connecting the bluetooth antenna.
Female BTB connector for connecting the FPC cable inside the front headphone head.
Laser carving IA02I 2118’s MEMS feedforward noise cancelling microphone is used for noise cancelling function to pick up external environmental noise.
All components of MONSTER CLARITY 8.0 ANC true wireless earphones.
MONSTER CLARITY 8.0 ANC true wireless earphones are very distinctive in appearance and have a very strong texture performance. The fuselage of the charging case is as warm as jade to the touch, and it presents the mystery of the starry sky in the middle of the night through the scattered dots of “flash powder”. The earphones have a handle-shaped in-ear design, frosted material, and the brand LOGO design consistent with the charging case greatly enhances the product’s recognition.
In terms of internal circuits, the design of the charging case is relatively simple, the built-in battery capacity is 470mAh, it is equipped with a circuit protection board, and supports both wired and wireless input power. The cable adopts the Type-C interface, and the TPS SY8815 bluetooth headset charging case solution charges the built-in battery, and boosts the charging for the headphones. The wireless charging adopts the Maxic MT5705 wireless charging receiver chip, which supports the Qi protocol and can provide a maximum output power of 5W. It adopts TPS SY5320 overvoltage and overcurrent protection IC, and a non-standard single-chip microcomputer.
A 10mm dynamic driver is used inside the earphone, a built-in LIYUAN 1054 steel shell button battery, and a lithium battery protection IC is set on the cable circuit. The main control of the earphone is WUQI WQ7033A bluetooth audio SoC, which supports Bluetooth 5.2 and integrates high-performance dual RISC-V CPU, HiFi 5 DSP and NPU. Supports FF+FB hybrid ANC and AI NN network intelligent call noise cancelling, with 3 built-in MEMS microphones in the earphone, to achieve high-quality noise cancelling effect. There are two Scientic SDHL1608F4R7MT full magnetic shielding precision winding inductors on the periphery of the main control to supply power for different voltages inside the bluetooth chip.