Baseus Bowie E9 true wireless earphones teardown


Baseus Bowie E9 true wireless earphones is a product of Baseus that focuses on the noise cancelling function. The dual-mic directional beamforming technology is used to filter ambient noise, and the AI ​​neural network algorithm is used to dynamically track the human voice to achieve a voice call effect of “no fear of wind and clear words”. At the same time, it also has a wealth of other functional applications, including cross-platform dual device connection, open the box and pair devices automatically, in-ear detection, baseus rapid charge, wireless charging, etc.

In terms of configuration, Bowie E9 is equipped with a 10mm PU + titanium composite diaphragm dynamic driver, Bluetooth 5.3 version, providing strong low-frequency sound and stable wireless connection. Using dual-channel low-latency technology, it supports adaptive enhancement of game and video sound effects, and realizes an immersive game viewing experience with synchronized sound and picture. In terms of battery life, earphones have a single battery life of 5 hours, and the charging case has a comprehensive battery life of 30 hours.

52audio teardown Baseus TWS earbuds include: Baseus Bowie M2, Baseus Bowie E2, Baseus AirNora, Baseus Encok W01, Baseus Encok W04 Pro, Baseus Encok W07, Baseus Encok W09 and Baseus Encok WM01 true wireless earphones. Let’s take a look at the detailed teardown report of this product.

01/ Baseus Bowie E9 Earphones Unboxing

The Baseus Bowie E9 box has a simple design, with the “Baseus” brand LOGO, earphone’s appearance rendering and product name displayed on the front.

The parameter information of the product is introduced on the back of the box, name: Baseus TWS true wireless bluetooth earphones, model: Baseus Bowie E9, battery capacity: 40mAh/0.148Wh (headphone), 400mAh/1.48Wh (charging case), headphone rated input: DC5V -80mA, rated input of charging case: DC5V-800mA, frequency response range: 20Hz-20kHz, charging interface: Type-C.

Inside the box are earphones, eartips, charging cable and documentation box.

The white charging cable uses a USB-A to Type-C interface.

Three pairs of silicone eartips of different sizes, earphones have been pre-installed with a pair of eartips to meet the individual needs of different users.

The Baseus Bowie E9 charging case is designed with rounded corners and a square shape. The front cover is provided with a bar indicator, and the “Baseus” brand LOGO is printed on the bottom.

A metal hinge is used at the back cover of the charging case.

The bottom of the charging case is equipped with a Type-C charging interface and a bluetooth pairing function button.

Open the charging case cover to display the placement status of the earphones, protruding from the charging cockpit for quick access.

The inner side of the charging case cover is silk-screened with product parameter information. Earphones: 40mAh/0.148Wh, input: 5V-80mA; charging case: 400mAh/1.48Wh, input: 5V-800mA.

The other side is printed with CE, FCC certification, and the recyclable logo.

Take out the earphones from the charging case.

The metal connector for charging the earphone is located at the bottom of the cockpit of the earphone.

The L/R logo is engraved on the cockpit.

Baseus Bowie E9

The overall look of the Baseus Bowie E9 true wireless earphones.

The overall appearance of the Baseus Bowie E9 earphones is a handle-shaped in-ear design. The earphone has a unique in-ear structure. Through the multi-point fine arrangement processing, the earphone radian and the ear canal can be seamlessly fitted, improving the comfort and stability of wearing.

The earphone handle adopts a rectangular design, and the bottom is further enhanced by a silver tail plug.

The indicator light on the earphone handle is used to feedback the working status of the earphone, and it is also a touch area for the control of various functions of the earphone.

There is a noise cancelling microphone pickup hole on the top of the headphone handle, and a metal mesh cover is provided to prevent foreign objects from entering the cavity.

There is a call microphone on the end plug of the earphone handle, which is also protected by a metal mesh cover.

On both sides of the tail plug at the bottom of the earphone handle are metal connectors for charging earphones.

The inner appearance of earphone, eartip design is more unique, showing the same curve as the fuselage.

The L/R logo is designed on the inside of the headphone stem tail plug, which is convenient for users to quickly distinguish.

The earphone pressure relief hole ensures air circulation in the cavity, reduces the internal and external pressure difference, and improves wearing comfort.

Remove the eartip, the oval earphone mouthpiece, and the fine dust-proof net protection to prevent foreign objects from entering the sound cavity.

A tuning hole is arranged on the sound outlet pipe to improve the air circulation in the sound cavity.

After actual measurement, the overall weight of the Baseus Bowie E9 true wireless earphones is about 45.6g.

The weight of a single earphone is only 4.0g, which is very light and improves the comfort of wearing.

Use the portable power tester to perform wired charging test on Baseus Bowie E9 true wireless earphones, the charging power is about 3.53W.

Use a portable power tester to test the wireless charging of Baseus Bowie E9 true wireless earphones, and the charging power is about 1.88W.

02/ Baseus Bowie E9 Charging Case Teardown

Through unpacking, we learned about the design of this product. Enter the teardown section below to see the internal structure design and configuration information.

Pry open the charging case and take out the internal cockpit structure.

The function button structure inside the bottom of the charging case.

The cockpit structure of the charging case, the battery is located in the middle position, and there are sponge pads up and down to protect it, which plays a very good protective role.

The bottom of the cockpit is provided with a wireless charging receiving coil, which is fixed on the plastic bracket at the bottom.

Remove the wireless charging receiving coil, and the lower plastic bracket is fixed with the cockpit structure by screws.

Remove the bracket and fix the motherboard to the cockpit with screws.

The charging case indicator light cable is connected to the motherboard through the ZIF connector.

Remove the motherboard, the bottom structure of the cockpit, and the indicator light guide column wrapped with black tape to prevent light leakage.

Remove the indicator light circuit, the bottom structure of the cockpit. There are four magnets for attracting the charging case cover and earphone.

Charging case indicator light cable circuit.

The hall element of the silkscreen AR0d1 is used to sense the magnetic field change when the charging case is turned on/off, and then notify the charging case MCU and earphone to pair or disconnect from the connected device.

10 LED indicators for feedback of charging case power information.

The main board circuit in the charging case, the wireless charging receiving coil and the battery are connected to the main board by wire welding.

The wireless charging receiving coil is set on the magnetic shielding sticker.

The internal lithium battery model of the charging case is YJ85173OK-2C, rated voltage: 3.7V, rated capacity: 400mAh/1.48Wh.

The battery is equipped with a circuit protection board, equipped with DW01 lithium battery protection IC and 8205A MOS tube, and is equipped with a thermistor to detect the battery temperature.

The front circuit of the charging case motherboard.

The circuit on the back of the charging case motherboard.

The Type-C charging interface female socket on the motherboard is fixed by soldering through holes.

Bluetooth pairing function button.

The NuVolta NU1680C wireless charging receiver chip is used inside the charging case, which is a highly integrated wireless power receiver. A synchronous rectifier is integrated and no bootstrap capacitor is required, providing high efficiency and low cost. And the output voltage can be adjusted to track the battery voltage, further reducing the power consumption of the charging system.

NU1680C can communicate with the transmitter system through ASK, and the communication conforms to WPC V1.2.4. FOD parameters can be configured with external resistors to pass the FOD test. The NU1680C also supports standard protection functions such as overcurrent protection, short circuit protection, overvoltage protection and thermal shutdown.

According to 52audio, audio products of Xiaomi, OPPO, Redmi, FIIL, UGREEN, TOZO and other brands have adopted NuVolta wireless charging receiver chips.

TPS SY8801 TWS earphone charging compartment SOC, specially designed for TWS earphone charging compartment. On the basis of the design to ensure safety and high reliability (supports 28V input withstand voltage, built-in full-function charging and discharging overvoltage, overcurrent, overtemperature, short circuit protection, etc.), it also integrates I2C communication function and internal communication isolation function . Through the I2C interface, the MCU of the system can read and configure the internal functions of the power supply and the parameters of battery charge and discharge management, and easily realize such as NTC protection, segmental adjustment of battery current, TWS earphones in and out of the warehouse, and the power output is automatically turned on. and other functions.

The integrated internal communication isolation module of SY8801 greatly optimizes the functional design of the smart TWS charging compartment. No complicated peripheral circuits are required, and the MCU can control the SY8801 by connecting it. It can not only realize the function of charging earphones, but also transmit data through the POGO PIN of the power supply connected to the earphones, and realize functions including uploading the power of the charging compartment, clearing and pairing the earphones in the charging compartment, restoring factory settings, and upgrading the headset software.

According to 52audio, the TPS power management chip has been adopted by Baseus, Xiaomi, OPPO, OnePlus, realme, Transsion, 1MORE, Baidu, Edifier, JBL, HARMAN, Lenovo and other brands.

Cooperate with the power management chip to boost the 3R3 inductor that charges the earphone.

The metal shrapnel on the motherboard that charges the earphones.

A non-standard MCU microcontroller, used for charging case lighting control.

03/ Baseus Bowie E9 Earbuds Teardown

Go to the earphone teardown section. Pry the earphone along the parting line of the headphone head.

The internal components of the headphone head are connected to the motherboard in the headphone handle through the via holes.

Magnet for fixing with charging case.

A buffer pad is provided to protect the connection between the cable and the earphone shell.

The circuit below the sponge pad, the positive and negative electrodes of the battery are welded on the cable, and an integrated battery protection chip is also welded.

Take out the battery unit, and there is a plastic part below which holds the battery.

Take out the plastic part, you can see that the speaker unit is connected to the cable by the wire.

Take out the speaker, the internal structure of the cavity.

The front of the Baseus Bowie E9 earphone speaker has a sealing ring around the edge.

After actual measurement, the size of the speaker unit is about 10mm, which is consistent with the official promotion.

The circuit on the battery FPC board.

Silkscreen 0wA3 integrated lithium battery protection IC.

The earphone uses a steel shell button battery, model: LIR1040, capacity: 40mAh, from YANJOO.

Pry open the back cover of the headphone handle, and connect the cable of the components in the headphone head to the motherboard through the BTB connector.

The inner side of the headphone handle cover is provided with a touch detection patch and a bluetooth antenna, and the microphone hole is provided with a rubber cover to improve the radio performance.

Components in the headphone head, including speakers, batteries and in-ear detection patches.

Male BTB connector for connection to motherboard.

The internal structure of the earphone handle cavity.

Pry off the tail plug at the bottom of the earphone handle, and the metal connector for charging the earphone is soldered on the motherboard. There is also a microphone sealing structure inside the tail plug to improve the acoustic performance.

Circuit on the motherboard side.

Circuit on the other side of the motherboard.

The MEMS microphone of the laser carving R141 A51D, from RAYKING, is used for voice call pickup.

The earphone call noise cancelling microphone is also RAYKING’s laser carving R141 A51D MEMS microphone. Dual microphones cooperate with AI call noise cancelling algorithm to achieve high-definition call effect.

Actions ATS3019 bluetooth audio SoC, the core adopts RISC32 simplified instruction set structure, the main frequency is 200Mhz. Built-in ROM, 8Mbits SPI Flash and 216K bytes RAM. Integrated power management, support lithium battery and DC5V power supply.

Actions ATS3019 supports Bluetooth 5.3 dual-mode, the transmit power is up to 10dBm, and the receive sensitivity is -95dBm, which effectively improves the stability of the audio connection. At the same time, it supports low-latency mode, the bluetooth audio signal delay is as low as 40ms, and it supports dual-mic ENC call noise cancelling, etc.

According to 52audio, products of Lenovo, RODE, Xiaomi, realme, JBL, Baseus, BULL, Motorola, UGREEN, FUNCL, HYMALAYA and other brands have adopted the Actions bluetooth audio master chip in large quantities.

Two precision wire-wound power inductors around the main control chip work with the ATS3019 internal step-down circuit.

The crystal oscillator that provides the clock for the bluetooth chip.

Female BTB connector for connecting components inside the headphone head.

Metal shrapnel for connecting the bluetooth antenna.

Silkscreen BE’s IC.

TianYiHeXin HX9023 touch detection IC integrates capacitive sensing AFE for specific absorption rate (SAR) applications. Support 1.8V power input, output data through I2C bus. The HX9023 supports up to three sensor inputs with offset compensation capacitors up to 400pF. HX9023 has high sensitivity and can detect human body approaching. Suitable for earphones and smart wearable products.

TianYiHeXin HX9023 details.

The LED indicator on the main board of the earphone is used to feedback the bluetooth pairing status.

All components of the Baseus Bowie E9 true wireless earbuds.

04/ Summary

The Baseus Bowie E9 charging case adopts a rounded square design, small and light in size, and the gradient bar-shaped indicator light adds a lot of color to it. The handle-shaped in-ear earbuds have a unique curve in appearance, and the eartips design with the same curve as the fuselage realizes the seamless fit between the earphone radian and the ear canal, presenting a comfortable wearing effect. The overall texture of earphones is also excellent, and it has a high degree of recognition.

In terms of internal circuits, the charging case has a built-in YANJOO 400mAh lithium battery, which supports both wired and wireless input power. Wired charging adopts Type-C interface, TPS SY8801 charging bin SOC, supports 28V input withstand voltage, built-in full-function charging and discharging protection, and also integrates I2C communication function and internal communication isolation function. Wireless charging adopts NuVolta NU1680C wireless charging receiver chip, integrated synchronous rectifier, no bootstrap capacitor, and can adjust the output voltage to track the battery voltage, further reducing the power consumption of the charging system. An unmarked MCU is also used for overall and charging case lighting control.

Inside the earphone, the headphone head has a built-in 10mm dynamic driver, 40mAh steel shell button battery and capacitive in-ear detection patch, which are respectively connected to the same cable, and then connected to the motherboard through BTB. The motherboard is equipped with two RAYKING MEMS microphones, adopts Actions ATS3019 bluetooth audio SoC, the core adopts RISC32 simplified instruction set structure, built-in large-capacity storage space, supports Bluetooth 5.3 dual-mode, low-latency mode, and supports dual microphones. TianYiHeXin HX9023 touch detection IC is used for touch operation function.

Source: 52audio

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