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.
The Monster Clarity 108 ANC true wireless bluetooth earbuds supports 10 minutes of charging and 120 minutes of battery life, echo cancellation, and can achieve 30 hours of use time with the charging case. The earbud has upgraded the experience of 4-mic noise cancelling, ENC call noise cancelling, and Bluetooth 5.2.
52audio has previously teardown two products including MONSTER CLARITY 8.0 ANC and MONSTER iSport ACHIEVE. Let’s take a closer look at the design and internal structure of the Monster Clarity 108 ANC true wireless bluetooth earbuds.
|1. Monster Clarity 108 ANC Charging Case Teardown
After reading the appearance of the Monster Clarity 108 ANC true wireless bluetooth earbuds, let’s go to the teardown of the earphones.
Pry open the snap-type fixed charging case cockpit, the power input small board in the cavity is connected to the main board through wires, and the bottom of the earphone cockpit is provided with a battery.
The soft light structure of the bottom shell of the charging case of the earphone is used to make the indicator light of the charging case softer.
The bottom of the headphone cockpit.
Take out the battery, the battery is fixed on the motherboard on the back of the charging cockpit by double-sided tape.
Unscrew the screws and remove the motherboard on the back of the charging pod.
On the back of the earphone cabin, there are 5 magnets for attaching the top cover of the charging case and the earphones.
The position corresponding to the opening of the LED light is provided with a soft light structure, which is used to soften the light of the LED light.
The charging case uses a hinge to open and close, and two magnets are designed at the opening and closing position, which will have suction when the charging case is closed.
Type-C power input interface female socket.
Screen-printed TVS tube of EUT for input overvoltage protection.
The back of the power input board.
The front of the charging case motherboard.
The back of the charging case motherboard.
Lithium-ion battery model in the charging case: NV901638, rated voltage: 3.7V, rated capacity: 520mAh/1.924Wh.
The battery has a circuit protection board, and the protection board is provided with a lithium battery protection IC and a MOS tube.
The other side of the protection board is provided with a two-in-one battery protection chip, which uses ICM CM1103 to protect the IC. The built-in high-precision voltage detection circuit and delay circuit can realize overcharge, overdischarge, overcurrent and short circuit protection of the battery by detecting the voltage and current of the battery. Protection circuit for single-cell Li-Ion/Li-polymer rechargeable batteries.
According to 52audio, there are also AUKEY, Skullcandy, OnePlus Buds, OnePlus Buds Z, OnePlus Buds Z2, OPPO Enco Air, OPPO Enco W31, OPPO Enco Free2, OnePlus Buds Pro, Soundcore R100 and ZTE LiveBuds Pro true wireless noise cancelling earbuds and other products use ICM’s lithium battery protection IC.
The pogo pin connector for charging the earbuds in the charging case.
Prisemi P14C1N overvoltage and overcurrent protection IC, withstand voltage up to 32V, overvoltage fixed 6V. The peripheral resistance of the overcurrent protection point is adjustable, the overcurrent response time is adjustable, and the overcurrent protection accuracy is 10ma, which can meet the overcurrent protection requirements of various adapters and various projects.
According to 52audio, a number of TWS headphones under brands including Xiaomi, OnePlus, and Soundcore have adopted Prisemi power management chips in large numbers.
The hall element of the silk-screen N520I 107 is used to sense the magnetic field changes when the charging case lid is opened and closed, and then notify the charging case MCU to control the earbuds to pair or disconnect from the connected device.
power switch button.
Chipowertech THP8414 power management/boost SOC chip, with a maximum output power of 2.5W and a maximum charging current of 500mA, can provide a single-chip solution with high efficiency, safety and minimal peripherals for TWS headphone charging bins and other similar applications.
LED light to indicate earphone pairing status.
LED light to indicate the working status of the charging case.
|2. Monster Clarity 108 ANC Earbuds Teardown
Go to the earbuds teardown section. Pry open the cavity along the parting line, and connect the front and rear cavities with wires.
The main board on the headphone stem is connected to the battery in the front cavity of the headphone by wires.
The internal structure of the front cavity of the earphone, the built-in speaker and the button battery are all connected by wires.
The battery is attached to the cover of the back cover of the speaker with double-sided tape.
The loudspeaker is provided with an acoustic cover to form a phase-reversed hole structure to enhance the sense of low volume.
Button-type lithium battery, model number: ICB1045 engraved on one side of the battery, rated voltage: 3.7V, from EVE.
Information on the other side of the battery, the rated capacity is 40mAh/0.148Wh.
After removing the acoustic cover, the inside of the earphone tuning hole is provided with a dust-proof net, and the tuning hole on the speaker is also protected by a dust-proof net.
The internal structure of the front cavity of the earphone, the opening is used to balance the air pressure.
The front of the speaker unit.
On the back of the speaker unit, a composite diaphragm is used.
After actual measurement, the size of the speaker is about 12.35mm.
Open the earphone handle, the internal structure of the cavity. The headphone handle cover and the headphone handle are glued with a lot of glue, which is sealed and waterproof.
The back of the earphone handle is provided with a Bluetooth antenna and a touch detection patch.
Remove the headphone motherboard.
There are magnets at the bottom of the earphone handle for attaching to the charging cockpit.
The front of the headphone handle motherboard.
The back of the headphone handle motherboard.
The laser engraved “2122 7X08” MEMS microphone is used to provide pickup function for voice and voice.
Connect the pogo pin connector of the capacitive touch detection patch.
Bluetrum BT8922E bluetooth audio SoC, using 40nm ULP process, built-in 32-bit high-performance RISC-V CPU, supports DSP instructions and neural network accelerators. Built-in 8MB Flash storage unit. Built-in high-performance bluetooth RF circuit, the wireless receiving sensitivity reaches -94dBm, and the transmit power is greater than 10dBm, which is suitable for different product forms and antenna structures.
BT8922E supports Sound+ Dual-MIC Beamforming ENC call algorithm, providing users with a clear call experience. Supports high computational precision ANC controller, optimizes the adaptability to special boundary conditions, and prevents user experience problems such as squeezing whistling and system instability caused by sudden loud noises. It supports Bluetooth 5.2 dual mode, integrates step-down and lithium battery charging functions, and can realize a simplified headphone design.
According to 52audio, many brands such as MEIZU, NOME, Transsion, LeTV, Lenovo, Philips, 360, Fantini, and AMOI have adopted Bluetrum solutions.
Silkscreen 9BABX’s integrated battery protection IC.
Touch detection IC with silkscreen “33D8 2130”.
The crystal oscillator that provides the clock for the bluetooth chip.
The charging contacts on the headphone motherboard.
All the components of the Monster Clarity 108 ANC true wireless bluetooth earbuds.
|3. Summary
In terms of appearance, the Monster Clarity 108 ANC true wireless bluetooth earbuds adopts a handle-shaped in-ear design, with a bright surface material, and the headphone head adopts a water drop suitable cavity design to better fit the ear. The charging case has a pie-shaped design, which is small and easy to carry.
In the internal configuration of the charging case, the battery capacity of 520mAh can provide users with an additional 24 hours of battery life. The charging case is also equipped with a Hall element, which enables the earphones to open the cover for easy daily use.
The charging case has built-in Chipowertech THP8414 power management/boost SOC chip, with a maximum output power of 2.5W and a maximum charging current of 500mA. Provides a single-chip solution with high efficiency, safety and minimal peripherals for TWS earphone charging compartment. In terms of protection circuit, ICM CM1103 protection IC is used, with built-in high-precision voltage detection circuit and delay circuit. By detecting the voltage and current of the battery, the overcharge, overdischarge, overcurrent, and short circuit protection of the battery are realized, and the earphone supports the fast charging function without causing too much damage to the battery. At the same time, with Prisemi P14C1N overvoltage and overcurrent protection IC, the withstand voltage is up to 32V, and the overvoltage is fixed at 6V, which can meet the overcurrent protection requirements of various adapters and various projects.
In the internal configuration of earbuds, the battery uses a 40mAh button-type lithium-ion battery to provide a single battery life of up to 6h. The bluetooth audio SoC adopts BLUETRUM BT8922E, adopts 40nm ULP process, built-in 32-bit high-performance RISC-V CPU, supports DSP instructions and neural network accelerators. Support Sound+ Dual-MIC Beamforming ENC call algorithm to provide users with a clear call experience. Supports high computational precision ANC controller, optimizes the adaptability to special boundary conditions, and prevents user experience problems such as squeezing whistling and system instability caused by sudden loud noises. It supports Bluetooth 5.2 dual mode, integrates step-down and lithium battery charging functions, and can realize a simplified headphone design.
Source: 52audio
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