Baseus AirNora 3 supports Hybrid Active Noise Cancellation (ANC), with a maximum noise cancellation depth of 45dB; supports AI adaptive adjustment and deep, balanced, and cozy noise cancellation modes. Equipped with a 10mm dynamic driver, it supports BISA, providing 360° spatial stereo. They supports one-key calling, call search, map positioning, and white noise sleep aid mode, etc. The single battery life is up to 6.5 hours, and the comprehensive battery life is up to 33 hours.
We have also teardown Baseus products including: Baseus Eli Sport 1, Baseus AirGo AG20, Baseus AS01, Baseus AeQur G10, Baseus Bowie M3, Baseus Bowie MA10, Baseus Bowie M2s, Baseus Bowie M2, Baseus Bowie W04 Plus, Baseus Bowie E5x, Baseus Bowie E9, Baseus Bowie E2, Baseus AirNora, Baseus Encok W01, Baseus Encok W04 Pro, Baseus H1S and Baseus AeQur V2. Let’s take a look at the detailed teardown report of Baseus AirNora 3.
01/ Baseus AirNora 3 Charging Case Teardown
Disassemble the charging case shell and take out the charging bin structure. The charging bin fixes the motherboard with screws.
Remove the screws and take out the motherboard and battery. The charging bin fixes the Hall element FPC with hot melt pins.
Disconnect the wires and separate the battery.
The circuit on one side of the charging case motherboard.
The circuit on the other side of the charging case motherboard.
Injoinic IP5528 TWS headset charging case management SoC is a multi-function power management SOC that integrates MCU, boost converter, lithium battery charging management, and battery power indication, providing a complete solution for TWS charging case. Thanks to the high integration and rich functions of IP5528, only a few peripheral devices are required in application, which effectively reduces the size of the overall solution and reduces BOM cost.
Injoinic IP5528 supports the follow-up charging function, which can achieve 10mV fine step adjustment of the charging voltage in the range of 3.2~5.5V, which can effectively improve the conversion efficiency from the charging case battery to the headset battery by 15%~20%, thereby increasing the comprehensive battery life of TWS earbuds by 15%~20%.
IP5528 only needs one inductor to achieve the boost/buck function, and supports low-cost inductors and capacitors. The synchronous boost system of Injoinic IP5528 provides a rated output current of 400mA and a conversion efficiency of up to 93%. When lightly loaded, it automatically enters sleep mode and the quiescent current drops to 15µA.
Injoinic IP5528 uses switch charging technology to provide a rated charging current of 1A and a charging efficiency of up to 90%. Built-in chip temperature protection and input voltage intelligently adjust the charging current. IP5528 has a built-in 12-bit ADC to accurately measure battery voltage and current. Supports 1/2/3/4 LED power display and digital power display. According to the product manual, IP5528 also supports an output voltage of 3.2V~5.2V and supports fast charging for headphones.
The power inductor with silkscreen 1R0 works with the power management chip.
The ZIF connector for connecting the Hall element FPC is from OCN, model: OK-F501-04325.
Prisemi P14C5N overvoltage and overcurrent protection chip, supports input overvoltage and undervoltage protection, and overcurrent protection after circuit startup.
Function button for bluetooth pairing.
Pogo Pin connector for charging earbuds.
Two LED indicators of different colors for feedback of remaining power information.
The charging case has a built-in lithium-ion battery pack, with a nominal voltage of 3.7V, a rated capacity of 400mAh 1.48Wh, and a charging limit voltage of 4.2V, from WEL.
Tear off the battery insulation protective film, and the front circuit of the protection board is equipped with a lithium battery protection IC, a MOS tube, and a thermistor.
The lithium battery protection IC with screen printing DW01A is responsible for overcharge, over discharge, and overcurrent protection of the battery. The MOS tube with screen printing 8205A.
Remove the Hall element FPC. The Hall element with screen printing “HfDu” is used to sense the change in the magnetic field when the charging case lid is opened/closed, and then notify the charging case MCU and earbuds to pair or disconnect with the connected device.
02/ Baseus AirNora 3 Earbuds Teardown
Disassemble the earbud-stem back cover. The inside of the cover is equipped with a bluetooth antenna and a touch detection patch. The microphone pickup hole in the lower right corner of the earbud motherboard is equipped with an acoustic rubber cover, which is connected to the FPC through a connector on the top.
Lift the motherboard, and there are wires soldered to the motherboard. The inner end of the earbud-stem cavity is equipped with a magnet and a charging contact.
The circuit on one side of the earbud motherboard.
The circuit on the other side of the earbud motherboard.
The MEMS microphone of the laser carving R3BT, used for voice calls and noise cancellation pickup, comes from RAYKING.
Bluetrum BT8932H bluetooth audio SoC, built-in 32-bit high-performance RISC-V processor core. Supports DSP instructions and runs at a maximum frequency of 140MHz. Built-in 16Mbits flash memory, 320KB RAM. Flexible GPIO pins with programmable pull-up and pull-down resistors. Supports GPIO wake-up or interrupt.
Bluetrum BT8932H complies with Bluetooth 6.0+BR+EDR+BLE specifications, with a maximum transmit output power of +10.5dBm and a receiving sensitivity of -94.5dBm@2M EDR. It supports TWS communication power consumption and TWS master-slave switches with balanced efficiency.
Bluetrum BT8932H has a high-performance stereo DAC with a signal-to-noise ratio of 104dB, supporting differential mode and VCMBUF mode. It has a three-channel high-performance ADC with a signal-to-noise ratio of 102dB. It supports three MIC amplifier inputs. It supports flexible audio equalizer adjustment. It supports 8, 11.025, 12, 16, 22.05, 32, 44.1, 48, 88.2, 96, 176.4 and 192KHz sampling rates. It supports feedforward, feedback and hybrid Active Noise Cancellation, neural network processing unit (NPU), low-power touch keys, in-ear detection, and integrated PMU.
Two Sunlord MPHM series power inductors. The Sunlord MPHM series has excellent performance including: anti-interference/anti-coupling, leakage magnetic field, large rated current, high reliability, and DCR. The appearance design has a Mark to identify the magnetic flux direction, which can ensure the consistency of the magnetic field direction after patching. The laminated process is adopted to meet the mainstream power requirements and provide customers with cost-effective products.
Sunlord SDCL0603Q series multilayer ceramic inductors. This series of products achieves high Q value and high self-resonant frequency (SRF) through carefully designed coils and electrodes. It is made by multilayer dry process and can provide high-precision and high-consistency products to meet the stringent requirements of precision electronic components.
24.0MHz crystal oscillator, used to provide clock.
IC with screen printing 135 B47M.
Metal dome connecting bluetooth antenna and touch detection sensor.
BTB connector connected to FPC, from OCN, model: OK-128GF010/2-35.
Disassemble the earbud cavity. All components are connected inside the front cavity through FPC.
Open the speaker and connect the noise cancellation microphone at the end of the FPC.
Remove the bracket. There is an in-ear detection sensor on the cavity wall, which is used to automatically pause music playback when the earphones are removed and automatically resume playback after wearing.
Take out the FPC of the front cavity.
The BTB connector connecting the FPC to the motherboard is from OCN, model: OK-128GM010/2-35.
Remove the battery and speaker on the FPC.
The built-in steel shell button battery, model: M1040S2, nominal voltage: 3.85V, capacity: 35mAh 0.135Wh, is from MIC-POWER.
The front of the earbud speaker uses a titanium-plated composite diaphragm.
After actual measurement, the speaker diameter is about 9.74mm.
The MEMS microphone of the laser carving R3BT is a feed-back microphone, which is used for the noise cancellation function to pick up ambient noise. It also comes from Ruiqin Electronics.
All components of Baseus AirNora 3 true wireless noise cancellation earphones.
03/ Summary
The charging case is equipped with a WEL 400mAh lithium-ion battery and uses the Injoinic IP5528 TWS charging case management SoC chip to provide a complete solution – integrated MCU, boost converter, lithium battery charging management, and battery level indicator. It supports the follow-up charging function, which can increase the comprehensive battery life of TWS earbids by 15%~20%.
The earphones have a built-in 10mm dynamic driver and a 35mAh steel-shell button battery; it use two MEMS microphones for voice calls and noise cancellation. The motherboard uses the Bluetrum BT8932H bluetooth audio SoC, Sunlord MPHM series power inductors, and SDCL0603Q series multilayer ceramic inductors.
PS: Translated from 52audio
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