SOUL ST-XS² true wireless bluetooth earphones teardown

0
25

Soul Electronics ST-XS2 High Performance True Wireless Earphones, IPX7 Waterproof Bluetooth 5.0 Noise Cancelling Earbuds

$79.99 at Amazon US


 

SOUL Electronics is an audio brand in the United States. Its products include true wireless earphones, head-mounted bluetooth headphone and bluetooth speakers. What is going to be disassembled today is its early product SOUL ST-XS² true wireless bluetooth earphones.

The SOUL ST-XS² charging case adopts a buckle design and comes with a triangular hook for easy carrying. The earphone is a bean-type in-ear design with earwings to improve wearing stability, and the earphone supports IPX7 waterproof and sweat proof. The overall design is biased towards sports scenes. . SOUL ST-XS² adopts bluetooth 5.0 chip, supports transparent mode, and can listen to ambient sound without taking off the earphone. The earphone has a battery life of about 5 hours in a single use, and the total battery life can be up to 25 hours with a charging case. Let’s take a look at the detailed disassembly of 52audio.

| 1. SOUL ST-XS² true wireless bluetooth earphones unboxing

The box has a side opening design, with a hook on the top for easy display in offline stores. The middle area of ​​the screen is the appearance of the earphones and charging case, the upper left corner is the SOUL brand logo, the bottom is the product model “ST-XS²”, the upper right corner is a few selling points, including: 25 hours of battery life, automatic pairing, AAC audio coding , IPX7 waterproof and earwings design.

There are detailed product information and accessory information on the back of the box.

On one side of the box, the earphones can wake up the voice assistant of the phone, listen to music, and make calls.

The earphones, charging case and accessories are placed separately.

Accessories include metal triangle hooks, charging cables, eartips and instructions.

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

The metal hook is convenient to fix the charging case on the backpack or body.

Replaceable two pairs of silicone eartips and two pairs of earwings.

There is a silver decorative strip on the lid with the SOUL brand logo printed on it.

Status indicator on the front of the fuselage.

There is a lanyard on the side for use with a metal hook.

After connecting the metal hook, the charging case can be hung on a backpack or waist for easy carrying.

The USB Type-C charging interface is located on the back of the charging case.

52audio used the ChargerLAB POWER-Z KT002 portable power tester to perform wired charging tests on SOUL ST-XS² true wireless bluetooth earphones. The charging power was about 2.2W.

The bottom of the charging case is a flat surface, and the input parameters are 5V, 0.5A.

The state of the earphones in the charging case is placed symmetrically. The product name is printed on the inside of the lid.

The buckle of the cover.

Pogo Pin for charging earphones.

The earphones also has an indicator light design.

SOUL ST-XS²

SOUL ST-XS² true wireless bluetooth earphones.

| 2. SOUL ST-XS² charging case teardown

First, let’s disassemble the charging case to see its internal structure design and chip material information.

The charging case is the light guide at the position of the indicator light.

The internal structure of the charging case is a sandwich structure, the battery is at the bottom, and the motherboard is fixed with screws.

Take out the motherboard and battery. There is a magnet on each of the left and right earphone sound chambers for adsorption and fixation.

The battery is fixed on the side of the motherboard with double-sided tape.

The charging case main board circuit has reserved the position of the wireless charging receiving circuit.

SGMicro SGM4056, a linear charging IC for lithium batteries with built-in overvoltage protection, with a maximum withstand voltage of 26.5V. The charging current and cut-off current can be adjusted to support thermal protection. The peripheral components are streamlined.

Details of SGMicro SGM4056.

ETAsolutions ETA1061, a 1μA quiescent current synchronous boost IC, is used to boost the charging case battery to charge the earphones.

According to 52audio, audio products of well-known brands including Edifier, 1MORE, Xiaomi, ZMI, realme, Baidu, Motorola, JVC, Panasonic, JBL, etc. have adopted a large number of ETAsolutions power management chips.

Details of ETAsolutions ETA1061.

2R2 inductor used for charging and boosting earphones.

The soft pack battery used in the charging case comes from CEL, model 602240, with a rated voltage of 3.7V, a rated capacity of 500mAh, and an energy of 1.8Wh.

The battery protection board is responsible for the overcharge, overdischarge and overcurrent protection of the battery.

A non-standard MCU is used to realize charging case control functions such as charging and discharging module management, battery power management, earphones communication, online upgrades, and production testing.

Gold-plated Pogo Pin for charging and transmitting data.

An LED indicator.

| 3. SOUL ST-XS² earphones teardown

Let’s continue to disassemble the earphone part. SOUL ST-XS² adopts bean-type in-ear design, small in size, equipped with earwings to improve the stability of wearing, the earphone adopts button control, and has hidden indicator lights.

The button position has SOUL brand logo.

The pickup hole of the call microphone.

The charging contacts of the earphones have the L/R logo on the shell.

Silicone eartips and the sound hole of the earphone.

There is a fine dust-proof net at the sound mouth to prevent foreign matter from entering.

Remove the silicone earwings, a groove on the side of the fuselage is stuck.

A pressure relief hole in the groove balances the air pressure inside and outside the earphone.

Disassemble the earphones along the parting line.

A close-up of the inside of the cover, the microphone position has a closed protective cover, and the shell is covered with black material to prevent light leakage from the indicator.

Take out the motherboard and soft pack battery.

The internal structure of the earphones.

The speaker unit and the magnet for the charging case are fixed with yellow glue.

The complete circuit inside the earphone is displayed, and the soft pack battery, speaker unit, and charging contacts are connected to the main board through wires.

The internal circuit of the main board is displayed, and the circuit board is marked with colored dots on the left and right.

The external circuit of the motherboard is displayed.

SOUL ST-XS² uses Realtek RTL8763B bluetooth audio SoC, supports bluetooth 5.0, built-in 32-bit ARM processor, 24-bit DSP, operating frequency up to 160MHz, built-in 8Mbits Flash memory, reducing PCB area.

Realtek RTL8763B has built-in lithium battery charging management, overvoltage, overcurrent, undervoltage protection and other battery protection devices. In terms of scalability, it supports three LED drivers, touch IC control, analog and digital microphone input, and supports dual microphones with binaural call function. In terms of noise reduction, it supports noise reduction function and ambient sound monitoring mode. It is an all-round TWS true wireless bluetooth earphones integrated solution.

According to 52audio, brands such as Amazon, Anker, FIIL, JLab, Xiaomi, Redmi, QCY, Toshiba, etc. have adopted a large number of Realtek TWS headphones.

The crystal oscillator that provides the clock for the bluetooth chip with a frequency of 40.000MHz.

Laser carving MBL8 RLLC’s MEMS silicon microphone is used for radio reception during calls.

PCB laminated bluetooth antenna with SMD package is used for bluetooth signal transmission.

Two LED indicators, with foam on the periphery to avoid light leakage.

Jog button.

Charging contact plate.

The soft pack battery in the earphones, model XU100702.

The battery protection board is responsible for the overcharge, overdischarge and overcurrent protection of the battery.

One side of the diaphragm of the speaker unit.

The speaker unit size is 5.94mm.

All components of SOUL ST-XS² true wireless bluetooth earphones.

Summary:

The charging case of the SOUL ST-XS² true wireless bluetooth earphones adopts a buckle switch design and comes with a triangular hook for easy carrying. The earphones is a bean-type in-ear design with earwings to improve wearing stability, and the earphones supports IPX7 waterproof and sweat-proof. The overall design is biased towards the use of sports scenes, and it was also a product with a higher configuration at the time.

The charging case uses the USB Type-C interface for input power. SGMICRO SGM4056 has built-in overvoltage protection and is responsible for charging the battery; the soft pack battery comes from CEL with a capacity of 500mAh; ETAsolutions ETA1061 is used to boost the battery output to charge the earphones; there is also a charging case in the charging case A non-standard MCU is responsible for the control of the whole machine.

For the earphone part, SOUL ST-XS² adopts Realtek RTL8763B bluetooth audio SoC, supports bluetooth 5.0, has a high integration level, and supports ambient sound monitoring mode; the earphone transmits signals through the PCB laminated antenna, and a single MEMS silicon microphone is used for call sound pickup. Push button control, soft pack battery, dynamic driver size is about 6mm, the overall design and materials of the earphones are also good now.

Source: 52audio


$79.99 at Amazon US

Make sure it says “ships from and sold by Amazon.com” to avoid counterfeits.

LEAVE A REPLY

Please enter your comment!
Please enter your name here