The audio brand Skullcandy was born in the United States in 2003. Its main business is the design of professional headphones and peripheral accessories. Its product designs are relatively novel, with bold and unique colors, and are deeply loved by young consumers in Europe and the United States. 52audio had disassembled their Skullcandy Sesh true wireless bluetooth earphones before.
Today we are going to teardown the Skullcandy Jib True true wireless bluetooth earphones. It is an entry-level product. The earphones has the iconic skull logo on the earphones. It is available in three colors; the earphones adopts a bean-type in-ear design, which can isolate the part. Noise; a single battery life of the earphones is about 6 hours, and the total battery life of the charging case is about 22 hours; in addition, the earphones supports single and binaural mode, IPX4 dustproof and waterproof, and the configuration is relatively general.
| 1. Skullcandy Jib True charging case teardown
First, disassemble the charging case and pry open the charging cockpit to see the internal structure.
Light guide at the position of the indicator light.
The front structure of the charging case, the battery is pasted on the motherboard, and the motherboard is fixed by screws.
Charging case back structure.
There is a cushioning foam between the bottom battery and the shell.
Remove the battery, there are three fixing screws on the motherboard.
Remove the screws and take out the motherboard. The Hall element at the opening of the box cover is connected to the motherboard through the FPC. There is red glue reinforcement near the connector.
A close-up of the inside of the charging cockpit shell. There is a magnet on each of the left and right earphone sound chambers to magnetically fix the earphone, and a magnet at the opening of the box cover is used to attract the box cover.
Charging case internal circuit.
Charging case The other side of the internal circuit.
MagnTek MT8691 micro-power Hall element. The magnetic field changes when the charging case lid is opened and closed will be sensed by the Hall element, and the charging case will be notified to the MCU and earphones to pair or disconnect with the connected device.
MagnTek MT8691 details.
The main board circuit display, there is a high integrated main control chip.
Sinhmicro SS809 is an AD-type microcontroller with integrated charge and discharge management, with built-in rich interface functions, flexible configuration modes and different low-power options. Mainly used in portable electronic devices that require charging and intelligent control, bringing streamlined peripheral costs, excellent performance and convenient development.
Sinhmicro SS809 has a built-in linear charging unit to charge the lithium battery. At the same time, it has a dedicated earphones communication interface to achieve two-way communication between the charging case and the earphones. There is also the QW series that supports wireless charging to meet different product specifications. Shengsheng Micro SS809 integrates MCU microprocessor and embedded flash memory, which can upgrade its firmware more easily, which is convenient for engineers to add personalized customization functions. Especially in terms of power display, in addition to controlling the display of 1-5 lights, it also supports RGB lighting effects, LED 188 digital tubes, customized patterns, etc., providing engineers with free programming space.
According to 52audio, many TWS earphones charging cases, including 1MORE, FIIL, Astrid, Edifier, Kugou, Nubia and other brands, have adopted Sinhmicro’s solutions.
The MOS tube of the silk screen P3A6.
The MOS tube of N3A6 silk screen.
A boost IC and a 47μH inductor.
charging case Soft pack battery model M801834, rated voltage 3.7V, rated capacity 500mAh/1.85Wh.
The battery protection board is composed of an S8261 lithium battery protection IC and 8205A N-MOS tube. It is responsible for the overcharge, overdischarge and overcurrent protection of the battery, and the thermistor detects the battery temperature. On the right is a self-recovery fuse.
Gold-plated Pogo Pin for charging earphones.
One LED indicator, use foam wrap to avoid light leakage.
| 2. Skullcandy Jib True earbuds teardown
Continue to disassemble the earphone part. The earphone is a bean-type in-ear design with a relatively small size and no excessive design.
The earphone is controlled by buttons. There is Skullcandy’s skull logo on the circular button, and there is an indicator light on the top of the body.
The pickup hole of the call microphone.
The charging contacts and L/R logo on the inside of the earphones.
A fine dust-proof net at the mouthpiece prevents dust from entering the earphone.
Disassemble the earphones along the parting line to start disassembly.
On one side are the battery and motherboard of the earphones, and on the other side are the speaker unit and charging contacts.
The battery is welded to the main board through wires, the components in the sound cavity are connected to the main board through FPC and connectors, and the connectors and FPC are glued and reinforced.
The speaker unit is connected to the FPC through a wire, and the FPC is also connected to the charging contacts of the earphones. In the middle is a magnet for adsorbing the charging cockpit.
The position of the speaker unit is fixed with white glue.
The speaker unit size is approximately 6mm.
Pry open the outer cover of the earphone.
There is an FPC bluetooth antenna on the inside of the cover, with metal contacts for connection, and an opening for the indicator light on the left.
The physical structure of the keys and the dust-proof net of the microphone pickup hole.
The outer cover is fixed by plastic posts and glue.
Separate the motherboard and the shell of the earphone.
Comparison of the size of the earphones motherboard and battery with RMB coins.
Button-type soft-pack battery, the upper and lower battery and the surrounding area are wrapped with foam glue. Under the foam glue, there are positive and negative nickel sheets, and the barley paper is separated from the battery core. The wires are directly welded to the battery tabs.
Uncover the barley paper to reveal the battery identification code.
Uncover the foam glue on the other side of the button battery to reveal the specification sticker, model 1254RA, rated voltage 3.7V, rated capacity 55mAh/0.148Wh.
The circuit on the main board side, the PCB adopts the immersion gold process.
The circuit on the other side of the motherboard, under the QR code sticker is the main control chip.
The main control chip of Skullcandy Jib True true wireless bluetooth earphones is BES WT230-UC. WindTunnel is a bluetooth chip brand under BES Technology. WT230-U is a highly integrated SoC with bluetooth 5.0 dual-mode and high-performance Cortex-M4F, suitable for audio and voice applications; WT230-U uses a highly integrated RF transceiver, high-performance audio codec and coverless headphones The driver minimizes the cost of external components and BOM.
WT230-U is manufactured with advanced low-power CMOS process and is packaged in 4*6mm 40-pin QFN package; bluetooth version 5.0, power consumption 8mA. WT230M/S/U, corresponding to WT200M/S/U respectively, can support mono/stereo/TWS bluetooth earphones solutions.
According to 52audio, a large number of true wireless earphones from brands such as Huawei, Samsung, Xiaomi, OPPO, JBL, 1MORE, Honor, Baidu and OnePlus have adopted BES solutions.
Laser carving 0763 GB43 MEMS silicon microphone, used for call pickup.
The integrated battery protection IC of silk screen 0RA3.
Connect the metal shrapnel of the bluetooth antenna.
Light guide and protective cover of indicator light.
Two LED indicators.
All components of Skullcandy Jib True earphones.
The Skullcandy Jib True earphone shell and charging case cover both have the brand’s iconic skull logo, with black as the main color. The charging case has a gray waistline design and the eartips are also gray. The appearance design is relatively simple.
The charging case uses a Micro-USB interface to input power. Sinhmicro SS809 MCU integrates functions such as charge and discharge management, earphones communication interface, indicator light control, etc., with rich interfaces, simplified peripherals, and convenient development; charging case has a built-in soft pack battery with a capacity of 500mAh; MagnTek Hall element is used to connect the earphone when the cover is opened.
In the earphone part, the Skullcandy Jib True main control chip adopts BES WT230-UC, supports bluetooth 5.0 dual-mode, and minimizes external components through a highly integrated RF transceiver, high-performance audio codec and capless earphone driver; a single earphone A MEMS silicon microphone is used for call pickup, with a built-in button-type soft-pack battery with a capacity of 55mAh.
The internal circuit design and workmanship of Skullcandy Jib True true wireless bluetooth earphones are relatively mature. It is reported that this product has been launched in China recently, and the competition for products in the same price range is very fierce.