RHA TrueControl ANC true wireless active noise canceling earphones teardown


Today we are going to teardown the RHA TrueControl ANC true wireless noise-cancelling earbuds. This product comes from the British headphone brand——RHA. From HiFi headphones to true wireless, RHA is known for its British design, precision engineering and high-quality materials.

The RHA TrueControl ANC earphones adopts an ergonomic design and has a good passive noise reduction effect after wearing. The active noise reduction function of the earphones can effectively eliminate some environmental noise; it supports the ambient sound mode and has multiple gears adjustable; the earphones uses a Qualcomm chip , Support aptX encoding and cVc call noise reduction.

RHA has also developed a matching APP for this earphones, which can perform EQ adjustment, custom buttons, search for earphones, upgrade firmware and other settings. The functions are very complete, and it does not feel like a HiFi brand product. 52audio has already After an in-depth evaluation, let’s take a look at the detailed disassembly.

| 1. RHA TrueControl ANC true wireless noise canceling earphones unboxing

The front of the box is composed of two large areas, gray and white. The center area is used to display the cavity design of the earphone; the upper left corner is the product name “TrueControl ANC”, the lower part is “Active Noise Cancelling Earbuds”; the upper right is the brand name “RHA” “, there is a blue color block at the bottom left to emphasize that the overall battery life of the earphones is about 20h; the bottom is the product features, ANC active noise reduction and ambient sound mode, 10 eartips, 3-year warranty; the bottom right is the British flag.

There is a hook on the top of the box for easy display in offline stores. The back of the box is the product function introduction in various languages, the content is as follows: active noise reduction; quick activation of the ambient sound mode; use of scientific data to simulate several ear types; ergonomic and comfortable to wear; support Qualcomm aptX and AAC high-quality streaming ; 5+15 hours battery life; including fast charging function; wireless charging; waterproof and splash-proof; international three-year warranty. The legend at the bottom right represents the “aviation grade Comply sponge eartips” in the package.

On the side of the box, there are 10 eartips that can be replaced by the earphone, 3 of which are Comply sponge eartips.

The bottom of the box is an introduction to some brand names and precautions when using them.

All items in the box include: earphones and charging case, USB Type-C interface charging cable, eartips and instructions.

The charging cable is USB-A to USB Type-C interface.

The eartips are designed on a metal plate with brushed texture for easy storage, which is the brand feature of RHA.

The number of pits on the top represents the size of eartips, one point is S size, two points are M size, and three points are L size; it can be taken out by pulling it horizontally during use, which is more convenient. The top 6 eartips are silicone eartips, and the bottom 3 eartips are Comply sponge eartips, which are more common on HiFi earphones. TWS earphones are equipped with less, which can make wearing more comfortable and have better sound insulation.

The new charging case has a protective sticker with the “Qi” logo printed on the back, indicating that the charging case area supports wireless charging and can be charged with a wireless charger that supports the Qi standard.

The protective sticker passes through the charging case and is difficult to reuse after disassembly.

The charging case uses a metal box cover with a product label on it.

CD texture on the side hinge structure.

The charging case has a skin-friendly coating on the surface of the charging case, which is waterproof and sweatproof. There are RHA brand name and three battery indicator lights on the front.

The USB Type-C charging port is on the curved surface on the side of the fuselage.

52audio used the ChargerLAB POWER-Z KM001C portable power tester to perform a wired charging test on the RHA TrueControl ANC true wireless noise-cancelling earphones, and the charging power was about 2.3W.

52audio uses the ChargerLAB POWER-Z KT002 portable power tester to perform wireless charging tests on the RHA TrueControl ANC true wireless noise reduction earphones. The input power is about 3.3W, and the actual charging power is not so high.

The opening and closing angle of the cover is just enough to place and take out the earphones, which can reduce the chance of accidentally dropping the earphones. The box cover is magnetically fixed when opened at a certain angle.

The status indicator of the earphones in the charging cockpit, blue is the status to be paired, lavender is connected, red is the charging status, etc. There is an indicator light on the left and right earphones.

There are a total of four Pogo Pins connected to the earphones in the charging case, and the outer ring is designed with a magnet to fix the earphones.

Three Pogo Pins fixed together are used for charging and data transmission functions.

There is a red dot on the right earphone shell and the right side of the charging cockpit, but not on the left ear, which is convenient for users to distinguish the left and right earphones.

There is a layer of insulating film on the new earphones to reduce the power loss during the transportation and sales of the earphones. It needs to be removed when using it.

The earphones and charging case weigh a total of 110.5g.

The charging case alone weighs 94g.

The left and right earphones weigh 16.7g in total.

RHA TrueControl ANC true wireless noise reduction earphones.

| 2. RHA TrueControl ANC charging case teardown

After unpacking the box, we have a comprehensive understanding of the appearance of the RHA TrueControl ANC true wireless noise reduction headphones. The unique body material and clamshell design are more recognizable. Although the true wireless products adopt this charging case design , But the appearance and function are different. Let’s take a look at the internal design of this earphones through disassembly and what chips are used.

Pry open the charging cockpit to see the internal structure.

The shell of the charging cockpit is made of hard rubber, and there are many physical buckles on the side, and no glue is used.

Squeezing by hand can produce certain deformation.

Internal structure of charging case.

The light guide structure of the earphones status indicator in the charging case.

Light guide.

The Pogo Pin that charges the earphones is connected to the motherboard through wires and connectors.

The outer ring of the Pogo Pin is wrapped by a magnet.

The internal structure after removing the motherboard.

The battery is fixed with a lot of glue.

A close-up of the structure of the shaft position. The magnet on the left is used to assist the lid closure and adsorption.

Remove the box cover and display the parts of the charging case. The shafts on both sides have realized more functions through a few simple components (see the introduction below). The three in the upper left of the picture are a group, with black metal shaft, milky white gasket, and metal circlip. The rest is another group. The picture lacks a screw for fixing (note the dot in the middle of the black metal shaft at the bottom left). Screws are used to fix the components, and the shaft body is also a nut. When disassembling, it was found that the manufacturer used very strong glue to ensure that the screws would not loose under long-term opening and closing actions. In the end, they could only use an electric grinder to thoroughly smooth the screw caps. The relatively complete components can be removed.

Information on the inside of the lid, model RHA TrueControl, input 5V⎓0.4A, charging case battery capacity 770mAh/2.849Wh.

At the shaft of the metal box cover.

Inside the shaft, the two round pits on the upper part cooperate with the components on the box body to give a sense of passage when opening and closing the box cover (coordinated with springs and balls). The groove on the right controls the opening and closing angle of the box cover.

The rotating shaft structure on the charging case, the steel ball is one of the components that produce a sense of paragraph, and the magnet plays a role of adsorption and fastening when the charging case is closed.

The structure on the other side of the charging case is relatively simplified, and only the components that produce a sense of paragraph remain.

The shaft structure is broken down. The third component from the left cleverly achieves multiple functions through the seesaw structure. While closing the suction and opening the limit position, it cooperates with the Hall element on the main board to realize the detection of the opening signal.

The charging case has a complete circuit inside, there are two PCBAs, and the components are connected by wires and connector sockets, FPC and connectors.

The light guide column assembly of the charging case indicator light.

There is a layer of foam wrap around the battery.

The positive and negative poles of the battery are spot welded with nickel tape and then the wires are welded.

The other pole of the battery.

The supplier of cylindrical lithium-ion batteries comes from Shenzhen GP Batteries Limited., model NTA3554-V1 ICR17/34, nominal voltage 3.7V dc, rated capacity 770mAh, charging limit voltage 3.7V.

The wireless charging receiving coil and circuit are fixed on the same plastic board.

The structure on the other side.

The charging interface PCBA is fixed with screws. There is a rubber protruding outward on the shell at the interface position to make it the same height as the body to fill the gap.

The USB Type-C charging interface is welded through holes to ensure plug stability.

The wireless charging receiving coil is fixed on a piece of magnetic isolation paper.

A close-up of the wireless charging receiving coil, wound with a single enameled wire.

The heat dissipation vias on the motherboard have no components on the back.

Wireless charging receiving circuit.

Resonant capacitor for wireless charging and receiving.

MOS tube used to switch wired power supply.

TI BQ51013B, a fully integrated wireless power receiver IC that complies with WPC 1.1 standards, can provide up to 5W of power.

Another PCBA circuit in the charging case.

There is a cushioning foam between the other side of the circuit and the battery.

The single Pogo Pin connected to the earphone has a silver magnet on the outside and fixing glue on the bottom.

The other three Pogo Pins connected to the earphones are fixed by a rubber module with a lot of glue on the top.

Three charging case indicator lights.

RGB LED indicators showing the status of the left and right earphones.

The Hall element of the silk screen GX80XD is located near the magnet of the shaft on the side of the main board. The change in the magnetic field when the lid is rotated will be sensed by the Hall element, and the charging case will be notified to pair or disconnect the MCU and the earphones with the connected device.

Circuit on the motherboard side.

Circuit on the other side of the motherboard.

The charging IC of silk screen V291 2268 is responsible for battery charging and discharging.

Maxim Integrated MAX17055 battery fuel gauge, used for charging case power display, supports a variety of batteries.

Maxim Integrated MAX17055 details.

The regulator IC of the silk screen P8 65.

The boost IC of the silk screen F912 boosts the built-in battery of the charging case to charge the earphones.

SGMICRO SGM4553 bidirectional two-digit voltage converter for communication voltage conversion.

SGMICRO SGM4553 detailed information.

Screen printing RZS lithium battery protection IC.

Screen printing CS2050 battery protection tube.

ST STM32F091CB, mainstream ARM Cortex-M0 basic series MCU, with 128 KB Flash, 48 MHz CPU, CAN and CEC functions.

STMicroelectronics STM32F091CB detailed information.

| 3. RHA TrueControl ANC earbuds teardown

Let’s continue to disassemble the RHA TrueControl ANC earphones part. The shell and the charging case are made of the same material, which has a certain degree of waterproof and sweat resistance; the earphone cavity is ergonomically designed, with irregular shapes, fits the auricle, passively lowers The noise effect is better.

The circular area with RHA Logo supports click and slide touch functions.

There are two relatively concealed openings in the groove, one is the pressure relief hole, and the other is the pickup hole of the feedforward microphone.

The pickup hole of the call microphone.

The three charging contacts and the magnetic module on the inside of the earphone, and the infrared optical distance sensor below.

Another metal contact is next to the red dot representing the right earphone.

Pressure relief/tuning hole near the mouthpiece.

The metal dust-proof net at the mouthpiece is a separate module.

The fuselage shell curve.

The fuselage shell curve. When wearing, insert the ear part into the ear canal and rotate it downward to stabilize it. The upper part of the shell is in contact with the top of the auricle, and leaning against the auricle helps to reduce the pressure on the ear and reduce wear fatigue. The size of the earphone cavity is slightly larger, and people with smaller auricles may need to adapt.

Disassemble the earphone shell along the mold line, and see that the button battery is fixed by a metal frame, which is also the positive electrode of the battery.

Take out the battery first, and compare the size of the button battery with a dollar coin.

Button battery comes from MIC-POWER, model M1454, diameter 14mm, thickness 5.4mm, rated voltage 3.7V, rated capacity 0.333Wh.

52audio learned that there are already Jabra, Edifier, vivo, Klipsch, Meizu, 2336321, JEET and other brands of audio products that use MIC-POWER button batteries.

There is a QR code label on the negative side of the battery.

The BTB connector position on the motherboard is reinforced with glue, and the sealing glue needs to be removed first.

The internal structure of the earphones.

The internal structure of the earphone shell.

Laser carving S2508 9619 MEMS silicon microphone.

Magnetic separator between the circuit and the battery.

There is a PCBA inside the housing.

Take out the main board structure and fix it with a plastic bracket.

The silicone protective cover corresponding to the two hidden openings on the front of the earphone shell has a pressure relief hole on the left and a microphone pickup hole on the right.

The cover plate on the shell can be removed, look at the structure design. The touch pad is connected to the motherboard through the FPC.

The protective cover for the microphone pickup hole of the call.

The earphones uses a large-area LDS antenna to transmit wireless signals.

Inside the protective cover of the call microphone.

Separate PCBA and plastic bracket.

The metal contacts of the LDS antenna.

The circuit inside the earphone housing.

The other side of the circuit.

The size comparison of the motherboard and RMB coin.

The earphones adopts a capacitive touch solution and touch pad.

Connect the two metal shrapnels of the LDS antenna.

Laser carving S2502 9818’s MEMS silicon microphone is mainly used to pick up ambient sound to assist active noise reduction and call noise reduction.

Azoteq IQS263B 3-channel capacitive proximity and touch controller.

Azoteq IQS263B details.

TI CSD85302L dual NMOS tube, used for lithium battery protection.

TI BQ29700 lithium battery protection IC.

The voltage regulator IC of the silk screen P8 65 supplies power to the MEMS microphone.

Silkscreen XDTG IC.

The memory of Silkscreen 160S U64A is used to store Bluetooth configuration information.

73ke IC with silk screen printing. Next to it is the interface for RF testing.

RHA TrueControl ANC true wireless noise-canceling earphones use Qualcomm QCC5121 Bluetooth audio SoC. This chip is designed to meet consumer demand for powerful, high-quality wireless Bluetooth listening experience in small devices, while also having low power consumption characteristics, which can achieve longer audio Play.

Qualcomm QCC5121 features: very low power consumption design; Bluetooth 5.0; ultra-small size; 2Mbps Bluetooth low energy (LE); supports powerful quad-core processor architecture; dual-core 32-bit processor application subsystem; dual-core Qualcomm Kaliimba DSP audio sub System; embedded rom + RAM and external Q-spi flash memory; high-performance low-power audio; 192kHz 24-bit I2S and SPDIF interface; 2-ch 98dBA earphone level D; 2-channel 99dBA line input (single-ended); fully programmable Digital ANC; flexible software platform, powerful new IDE support; aptX, aptX HD and aptX Adaptive support; designed to reduce eBOM through highly integrated SoC design; support Qualcomm TrueWireless stereo and Qualcomm TrueWireless stereo enhanced version; integrated battery charger , Support internal mode (up to 200mA) and external mode (up to 1.8A).

According to 52audio, there are already Anker, Bose, Beyerdynamic, B&O, Cleer, Edifier, Little Bird, Xiaomi, Microsoft, OPPO, vivo, Sony, 1MORE and other well-known brands that have adopted Qualcomm’s Bluetooth audio SoC.

Qualcomm QCC5121 detailed parameters.

There is also a PCBA in the sound cavity, and the three-point metal shrapnel on the main board is the negative contact of the battery.

The dynamic speaker unit is fixed with black glue.

Take out the PCBA and look inside the housing.

The Pogo Pin module and the sensor position are connected to the motherboard with a lot of glue, which plays a certain waterproof role.

Another single Pogo Pin.

The MEMS silicon microphone of LeDiao 92S MPSL, the feed-back microphone is used to pick up the sound in the ear canal to assist active noise reduction.

The size of the speaker unit is about 6mm, which is consistent with the official publicity.

The size comparison of PCBA and RMB coin in the sound cavity.

Circuit on the motherboard side.

A close-up of the infrared optical distance sensor, used to detect the wearing state of the earphones.

TI TXS0102 bidirectional level voltage converter for communication between peripheral devices and processors.

The metal piece connecting the negative electrode of the button battery is welded to the main board.

The metal frame that holds the battery and supports the internal structure is also the positive contact of the battery.

Circuit on the other side of the motherboard.

Silkscreen STANC2 is ST STMicroelectronics’ DSP, which integrates digital configuration feedback and active noise cancellation (ANC) processing technology.

Silk screen TBJM IC.

Silk screen JXJ 931 IC.

The IC of the silk screen FWJ 021.

Silkscreen 1U18 IC.

All components of RHA TrueControl ANC true wireless noise canceling earphones.

| Summary:

Both the RHA TrueControl ANC earphones and charging case are made of the same skin-friendly material, which improves the hand feel and also has a certain degree of dust and water resistance; the box cover is made of metal material to improve the protection and quality; the earphone cavity is ergonomically designed and shaped Irregular to fit the auricle. The overall product design is very elegant from appearance to structure and accessories.

At the charging case shaft structure, steel balls and magnets are used to make the sliding smoother. At the same time, there are grooves and magnets to control the opening and closing angle of the box cover and the sense of paragraph. The corresponding position on the motherboard has a Hall element to enable the earphones to realize the function of opening and connecting the cover; There are two PCBAs inside the case, and the components are mainly connected through wires and connectors, FPC and connectors; charging case inputs power through the USB Type-C interface, and a power management chip is responsible for battery charging and discharging; wireless charging receiving chip It is TI BQ51013B; the cylindrical lithium battery comes from GP Batteries with a capacity of 770mAh, and Maxim Integrated MAX17055 is responsible for calculating the battery power; there are various semiconductor devices on the motherboard for protecting the circuit and the battery; the ST STM32F091CB microcontroller is responsible for the overall control.

The internal circuit of the RHA TrueControl ANC earphone is also composed of two PCBAs. There is a set of fixed batteries in the middle and the metal bracket supporting the internal structure is the positive and negative contacts of the battery. The design is clever; the earphones uses Qualcomm QCC5121 Bluetooth audio SoC, supports Bluetooth 5.0 and aptX encoding, It has low power consumption characteristics; there are three MEMS silicon microphones in the earphones, and two microphones are used for active noise reduction. The noise reduction chip comes from STMicroelectronics. It is unknown whether the call noise reduction is a dual-mic solution or a three-mics solution; the earphones uses a capacitive touch The control solution, the touch chip is Azoteq IQS263B; the button battery comes from MIC-POWER, the capacity is 0.333Wh about 90mAh; there are also many ST and TI semiconductor devices to protect the internal circuit; the overall structure design and materials of the product are relatively good.

Source: 52audio


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