In May 2021, it became a month when the TWS headset was released. Nearly ten products were listed. At the OPPO Reno6 series of new product launch conferences on May 27, OPPO also launched the third product OPPO ENCO Free2 real wireless noise reduction headset in May 27.

OPPO ENCO FREE2 real wireless noise reduction headset continues the design voice of OPPO Enco X in appearance design, but it has optimized a lot of details in many ways, further enhance the user’s use and wearing experience.

In terms of functional configuration, two personalized customization techniques are mainly used, one is personalized noise reduction for noise reduction function, and the other is a personalized hearing of music experience; Microphone calls for noise, double -click remote control shooting, etc.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Earlier, I also disassembled OPPO ENCO X, OPPO ENCO W51 real wireless noise reduction headset, OPPO ENCO Air, OPPO Enco Air smart version, OPPO Enco W31, OPPO ENCO Free real wireless Bluetooth headset, let’s take a look at it again. Look at the design and internal structure configuration of this product ~

拆解报告:OPPO Enco Free2 真无线降噪耳机

1. OPPO ENCO Free2 noise reduction header opens out of the box

拆解报告:OPPO Enco Free2 真无线降噪耳机

The packaging box uses the new design of the OPPO Enco Air series. The new packaging uses black and white color schemes, highlighting the “OPPO ENCO” series of product logos, the large area on the right shows the appearance of the product, and the product OPPO brand logo and free2 product model.

Information on the back of the box, there is a product name OPPO Enco Free2 real wireless noise reduction headset, deep personalized noise reduction display, OPPO X Dana joint tuning, transparent mode, three wheat call noise reduction, Bluetooth 5.2 low latency dual dual dual double Biography, up to 30 hours of music played 6 product features.

拆解报告:OPPO Enco Free2 真无线降噪耳机

There are some functional parameter information on the label, headset model: ET171, charging box model: ET172, sound unit: 10mm dynamic ring, Bluetooth version: 5.2, battery capacity: 41mAh (headset)/480mAh (charging box), charging input (charging input (charging box) (charging box) (charging box) Charging box): 5V 等1A, etc.

The items in the packaging box include headsets, earplugs, data cables, and documents in different boxes.

2 Different sizes of silicone earplugs with earphones with a pair of headphones, with a total of three specifications. Compared with OPPO ENCO X, the ear hat shape can effectively reduce the ears and help release ear pressure.

拆解报告:OPPO Enco Free2 真无线降噪耳机

USB-A to Type-C charging cable.

The front of the charging box is close -up, oval -shaped appearance, and the front cover is set up with a gradual pushing surface for easy opening and closing. There is a state indicator light in the middle to help users know the state of charging box.

Close -up on the back of the charging box, integrated shaft design. The OPPO brand LOGO is designed at the shaft structure.

拆解报告:OPPO Enco Free2 真无线降噪耳机

OPPO brand logo close -up.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Type-C charging interface close-up.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Bluetooth pairing function is specially written.

Open the charging box, the headset is placed in the charging cockpit. Compared with OPPO Enco X, there have been obvious changes on the appearance curve, and the headset placement has also changed. It can be worn directly without adjusting.

拆解报告:OPPO Enco Free2 真无线降噪耳机

OPPO ENCO FREE2 True wireless noise reduction headset is a list of overall appearance.

There are charging information on the inside of the charging box cover: ET172, input: 5V⎓1A, output: 5V⎓300mA, rated capacity: 480mAh/1.824Wh, CMIIT ID: 2021DP1951, Made in China.

The charging box cockpit is specially written by the metal shot of the headset.

After the actual measurement of my love audio network, the overall weight of OPPO ENCO FREE2 real wireless noise reduction headset is about 48.3g.

The weight of the charging box is about 39.6g.

The weight of the two headphones is about 8.9g.

My Audio.com uses ChargerLab Power-Z KM001C portable power tester to conduct a wired charging test on OPPO ENCO Free2 real wireless noise reduction headset, and the charging power is about 2.54W.

拆解报告:OPPO Enco Free2 真无线降噪耳机

2. OPPO ENCO Free2 noise reduction headset disassemble

拆解报告:OPPO Enco Free2 真无线降噪耳机

Charging box disassembly

拆解报告:OPPO Enco Free2 真无线降噪耳机

Enter the disassembly part, pry open the charging cockpit, and remove the internal structure.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Charging box lid metal spring specially written.

There is a sealing rubber ring on the inside of the charging interface.

Inner side of the indicator light, the optical close -up of the light.

Inner rubber pads on the function of the function.

拆解报告:OPPO Enco Free2 真无线降噪耳机

At a glance of the back structure of the charging cockpit, the battery unit is fixed in the plastic frame.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The charging cockpit is close -up, and the LED indicator light is set on the FPC duct.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The charging box motherboard is located at the bottom of the charging cockpit.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The FPC line on the right side of the charging cockpit is set on the FPC line with function keys and Hall components used to detect the charging box switch.

The charging contacts of the headset are welded on the charging box motherboard.

The FPC cable is connected to the motherboard through the line socket.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Another line socket close -up.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The Type-C charging interface is welded on the motherboard, and glue reinforcement protection.

Type-C charging interface Lottenity information eb4k11.

拆解报告:OPPO Enco Free2 真无线降噪耳机

LED indicator is written.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Function button is specially written.

The Hall component of the Silk Printing AP1L1, the magnetic field change when the charging box cover is turned on and closed will be perceived by the Hall component, and then notify the charging box MCU and the headset to match or disconnect the connected device.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Take out the components on the charging cockpit and place the structure of the battery unit.

The structure close -up of the welding motherboard, the glue is fixed on the charging cockpit.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The back of the main circuit inside the charging box.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The main circuits inside the charging box are on the front.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The rechargeable lithium -ion battery pack consists of two soft bag batteries parallel, model: XE208, rated capacity: 480mAh/1.824Wh, charging limit voltage: 4.35V, nominal voltage: 3.8V, manufacturer: Chongqing Zijian Electronics Co., Ltd..

Battery seal QR code information.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Two soft bag batteries are welded on the battery protective board.

The capacity of a single battery is 240mAh/0.912Wh, and the model is 601724, from VDL Zijian Electronics.

The wires on the battery protection board and the protection IC are protected by glue.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The main board is close -up.

Close -up on the back of the motherboard.

Eastsoft East Soft carrier HR8P506 MCU chip, an internal integrated 32-bit ARM Cortex-M0 CPU core. Integrated multiple 16 -bit and 32 -bit timers/counter, UART modules with infrared sending modulation functions, communication interfaces compatible with the 7816 protocol, SPI and I2C communication module, real time clock module RTC, LCD driver supporting the stop display and flashing function Module, 12 -bit ADC, and LVD modules for system power monitoring.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Eastsoft East soft carrier HR8P506 detailed information.

拆解报告:OPPO Enco Free2 真无线降噪耳机

TPS Siyuan Semiconductor SY8801 TWS Headphones SOC, specially designed for TWS headset charging warehouses, based on the design of ensuring safety and high reliability (supports 28V input resistance, built Warm, short -circuit protection and other functions) also integrates I2C communication functions and internal communication isolation functions. Through the I2C interface, the MCU of the system can read, configure the function inside the power supply, and the parameters of the battery charging and discharge management. Waiting for functions.

The internal communication isolation module integrated by SY8801 has greatly optimized the functional design of the smart TWS charging compartment. Without complex peripheral circuits, the MCU can be implemented by connecting to SY8801. Not only can the functions of the headset charging, but also the communication transmission of data through the power supply POGO PIN connected to the headset, to achieve the power upload of charging warehouse power, the headset clearance pairing in the charging warehouse, the restoration of factory settings, and the upgrade of the headset software.

拆解报告:OPPO Enco Free2 真无线降噪耳机

According to the disassembly of my love audio network, the power management chip of Siyuan Semiconductor has been adopted by many well -known brands such as OPPO, Xiaomi, Baidu, Wan Mo, 233621, Chuanyin, Demon Banquet, Innovation Technology, OnePlus and other well -known brands.

拆解报告:OPPO Enco Free2 真无线降噪耳机

TPS Si8801 detailed information diagram.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The stabilization IC of the silk seal AM.

拆解报告:OPPO Enco Free2 真无线降噪耳机

LPS Micrology Semiconductor LP5301 overcurrent protection IC is a overvoltage protection (OVP) and programmable overcurrent protection (OCP) device. When any input voltage and input current exceed the threshold, the device will turn off the internal MOSFET to disconnect VIN and VOUT to protect the load. Temperature protection (OTP) function monitoring chip temperature to protect the equipment.

拆解报告:OPPO Enco Free2 真无线降噪耳机

LPS micro source semiconductor LP5301 detailed information diagram.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Switching of Silk Print N6s.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Headset disassembly

拆解报告:OPPO Enco Free2 真无线降噪耳机

At a list of OPPO ENCO FREE2 headphones, the headset continues OPPO’s simple and clean double runway round geometric stitching design.

The backboard of the headset handle is treated with optical coating process, which shows different luster at different angles, which enhances the texture and fashion of the headset. The touch area is designed with a rounded runway round plane, which is more likely to perform blind operation and improve the accuracy of touch.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The appearance curve of the headset is designed with a low -voltage streamline, which is used to improve the pressure sensing of the earphones to the ear screen, the ear canal, the ear canal and other positions to improve the comfort of wearing. There are two discoloration holes on the front, covering the internal dust net, keeping air circulation in the cavity, and balanced air pressure inside and outside the headset.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Feeding the noise reduction microphone open hole, located on the side of the headset.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Calling microphone is close -up.

Metal tails used for charging boxes for charging boxes.

Remove the earplugs, and there is a small fliphole at the bottom of the sound tube.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The oval -shaped sounds are close to the mouth, and metal nets are covered to prevent foreign objects from entering the sound cavity.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Remove the back panel of the headset handle along the module line and pry open the headset cavity.

The headset optical coating process backplate is fixed with double -sided glue.

拆解报告:OPPO Enco Free2 真无线降噪耳机

There is also a layer of plastic board under the headset handle, which is fixed with touch sensor exhaust and printing LDS laser antennas.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Remove the headset and charging tail.

拆解报告:OPPO Enco Free2 真无线降噪耳机

List of headset disassembly.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Plastic board front -hand close -up.

Close -up on the back of the plastic board.

List of the internal structure of the headset handle cavity.

There is a capacitive -type ear detection sensor in the cavity of the headset, which connects to the motherboard through the contact.

拆解报告:OPPO Enco Free2 真无线降噪耳机

List of the front circuit of the motherboard.

拆解报告:OPPO Enco Free2 真无线降噪耳机

List of the backboard circuit.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Comparison of the size of the motherboard with one yuan coin.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The components in the headset are fixed in the front cavity, and the battery is protected by plastic framework.

The FPC board in the cavity is fixed to both ends of the upper and lower ends of the frame.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The side fixation is used for alien magnets that are adsorbed with the charging box.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The bottom of the frame is written in FPC board, the battery is welded on the auxiliary plate and the glue is fixed.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The internal speaker inside the cavity is fixed through glue.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Remove the components on the plastic frame.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Comparison of batteries with one -dollar coins.

拆解报告:OPPO Enco Free2 真无线降噪耳机

FPC board inner close -up.

The internal speaker unit of the cavity is close -up, and the back of the back prints E119.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Fastened soft bag battery model 210405, rated capacity: 41mAh/0.155Wh, rated voltage 3.8V. Also from VDL Chongqing Zijian Electronics.

Tear off the external label, the wire printing information on the battery is consistent with the label.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Battery back seal QR code.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Plastic framework inside the headset.

The front of the dynamic circular speaker unit is close -up.

After the actual measurement of my love audio network, the size of the speaker is about 10mm, which is consistent with the official publicity.

Below the speaker unit is a rear feed microphone for noise reduction function, and it is fixed on the cavity wall through glue. There is a dust -proof net coverage inside the upper pressure hole.

The capacitive in -ear detection sensor unit on the front cavity body is detected to improve the accuracy.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Lottery R111 ADMF MEMS noise -canceling silicon microphone.

拆解报告:OPPO Enco Free2 真无线降噪耳机

MEMS silicone wheat at the bottom of the headphone handle R111 ADMF is used for voice call pickup.

Metal shifts used to connect the Bluetooth antenna.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Goodix Huiting Technology GH611 capacitance -type ear -in -ear detection and touch 2 -in -1 chip, which is used in ear -in -ear detection and touch button detection.

Huiding Technology GH61X series chips, using human capacitor detection patented technology, can assist true wireless earphones to achieve automatic dormant, automatic wake -up, mainstay switching, music automatic start and stop Rich human -computer interaction function.

拆解报告:OPPO Enco Free2 真无线降噪耳机

The GH61X series adopts dual -channel ear detection and capacitor detection solution only to the characteristics of electrode response, making it lower than traditional optical detection schemes. The internal PMU and MCUs are integrated inside the chip. The algorithm runs independently on the film and reports the incident directly to the main control. There is no need to do data processing.

拆解报告:OPPO Enco Free2 真无线降噪耳机

According to the disassembly of my love audio network, the TWS headset of Baidu, OnePlus, vivo, OPPO and other brands also use this ear -entry testing and touch 2 -in -1 solution.

拆解报告:OPPO Enco Free2 真无线降噪耳机

GOODIX Huiding Technology GH61X frame diagram.

拆解报告:OPPO Enco Free2 真无线降噪耳机

TPS Siyuan Semiconductor SY8602 linear lithium battery charging IC is used to charge the built -in battery of the headset, supports 28V input overvoltage protection, supports 4.2/4.35V batteries, and the maximum charging current is 500mA.

Detailed information of SY8602.

BES Hengxuan BES2500YP ultra-low power Bluetooth audio SOC, supports dual-mode Bluetooth 5.2, adaptive ANC active noise reduction function, internal integration of high-fidelity audio DAC and ADC; The power supply of the low -power sensor hub’s subsystem greatly reduces power consumption, and also has strong application processing capabilities. And optimize the TWS application through Hengxuan Patent IBRT technology to improve the RF performance in the TWS system.

拆解报告:OPPO Enco Free2 真无线降噪耳机

According to the disassembly of my love audio network, I have already used Huawei, Samsung, Xiaomi, OPPO, JBL, Wan Mo, Honor, Baidu, OnePlus, Chuanyin and other real wireless headphones to use Hengxuan’s solution.

BES Hengxuan BES2500YP Detailed Information Map.

拆解报告:OPPO Enco Free2 真无线降噪耳机

OPPO ENCO FREE2 real wireless noise reduction headset disassembles the family portrait.

拆解报告:OPPO Enco Free2 真无线降噪耳机

Third, my love audio network summary

OPPO ENCO FREE2 real wireless noise reduction headset continues the design voice of OPPO Enco X in terms of design. The charging box has added a gradual pushing face. sex. The appearance of the headset is designed with a low -voltage streamlined line, with improved ear caps to improve wearing comfort. The treatment of the headset backplane optical coating process enhances the texture and fashion of the headset.

In terms of internal structure configuration, the cockpit structure of the charging box is very unique. The built -in battery is placed in the cockpit “belly”, which is isolated from the motherboard unit and other components. The battery consists of two 240mAh soft bag batteries in parallel. At the bottom of the charging cockpit, the Type-C interface input power is used, which is responsible for input protection and battery charging management by SY8801; micro-source semiconductor LP5301 provides overvoltage protection; The light state shows other functions such as battery remaining power detection.

Inside the headset, the battery unit in the headset head is also designed with plastic framework protection. The buckle soft bag battery is located in the frame with a capacity of 41mAh and also comes from Zijian of Chongqing. The FPC board is located on the upper and lower ends. The ear detection sensor is connected to the motherboard in the headset handle through the BTB connector; there is also a ear -in -ear detection sensor in the rear cavity, which improves the accuracy of the double -road detection.

拆解报告:OPPO Enco Free2 真无线降噪耳机

There is a plastic plate inside the headset backplate with a touch sensor and a printed LDS Bluetooth antenna on it. The motherboard below the plastic board is connected to the Bluetooth antenna through a metal shochrius; on the motherboard, the main control chip is Hengxuan BES2500YP ultra -low power Bluetooth audio audio audio audio audio SOC, supports dual -mode Bluetooth 5.2, adaptive ANC active noise reduction function, internal integration of high -fidelity audio DAC and ADC; Siyuan semiconductor SY8602 lithium battery charging IC is charging the built -in battery of the headset; 2 -in -1 chip, which is used for dual -in -ear detection and touch button function for the headset.

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