Disassembly Report: FiiO Feiao EH3 NC Noise Reduction Bluetooth Headset

FiiO Feiao is an innovative technology enterprise focusing on a variety of portable audio products such as lossless music players, earphone power amplifiers, earphones, etc. It takes "music, unlimited music" as its music proposition and continuously creates more easy-to-use, fun and pleasant audio products for consumers who love music and pursue fashion and high-quality life. I loved the audio net before.FiiO Feiao M3 Pro Portable Lossless Music Player,FiiO Feiao μBTR Bluetooth Audio Receiver,FiiO Feiao UTWS1 True Wireless Bluetooth Receiverand other products.

Today, I bring you Feiao's latest Bluetooth headset FiiO Feiao EH3 NC, which supports active noise reduction. FiiO Feiao EH3 NC is simple and fashionable in appearance design, with complete functionality. The earphone adopts removable earmuff design, breathable earmuff, head pad mesh cloth, soft and comfortable filler; earphone shell 2.5D carbon fiber glass texture panel improves texture and recognition; earphones can be flipped, folded and stretched, and can be adjusted freely according to individual needs.

The configuration adopts Qualcomm Bluetooth chip and supports aptX HD format Bluetooth coding. ADI professional noise reduction chip, multi-microphone coordination to achieve active noise reduction function; Support USB DAC function, can decode digital audio, support 3.5mm audio input; Also built-in NFC, support one touch connection; The endurance has reached an ultra-long 50 hours, and the endurance can also be realized for 30 hours in noise reduction mode. Let's take a look at the internal structure of this product ~

1. FiiO Feiao EH3 NC Unpacking

packing box adopts multi-layer structure with black background. FiiO LOGO is on the upper left side of the front, and the product name is EH3 NC below. There are dual Hi-Res Audio authentication marks for wired input and Bluetooth input at the top of the right, and Qualcomm aptX HD, LDAC ANC, Bluetooth/SBC/NFC connection marks at the bottom. The middle area has a rendering of the right ear.

, there are product names: EH3 NC head-mounted wireless noise reduction headphones, precautions, some information of Guangzhou feiao electronic technology co., ltd, FCC, CE certification, etc.

There is a graphic operation guide on the inner box.

box, and earphones and wires are placed in the storage box.

the top of the storage box with FiiO brand logo.

storage box, the outer layer has a breathable storage bag.

storage box includes earphones, data cables, and 3.5mm to 3.5mm audio cables.

USB-A to Type-C data lines.

3.5mm to 3.5mm audio cable.

3.5mm audio cable interfaces are all three-stage.

headset is displayed on the outside in the folded state, which can be folded inward by a large margin.

earphone is displayed in the folded state. The earmuff and head pad are made of leather-like material with soft filler.

the overall appearance of the outer side of the earphone, the control keys are concentrated on the right ear, the back plate is made of 2.5D glass, and the inner side is printed with carbon fiber texture.

the overall appearance of the inside of the earphone, and the inside of the earmuff has a large L/R mark.

The wearing status of the headset is displayed.

the thickness of the head pad is compared with that of a dollar coin, the head pad is relatively thick, the filler is soft, and it is comfortable to wear.

right ear earmuff.

earphone has a connecting ring belt, which adopts metal-like technology and has FiiO LOGO on it.

back plate adopts 2.5D glass carbon fiber texture.

close-up of five power indicators, you can check the power status of the headset at any time.

microphone opening.

three function buttons to realize the functions of volume increase and decrease, up and down, and pause playback.

close-up of 3.5mm audio cable interface.

Close-up of the ANC active noise reduction switch.

power key and a microphone opening.

earphone pressure relief hole with dust net protection inside.

frame and the earphone.

Close-up of earphone earmuff on the left.

Dual Hi-Res Audio certification mark for wired input and Bluetooth input is printed on the junction ring at the hinge structure of the left earphone.

Close-up of the opening of the left headphone microphone.

Close-up of the Type-C charging interface.

earphone hinge structure close-up, made of metal material, used to achieve inward folding.

head beam stretch slide rail, outer metal material, engraved with scale.

the depth of the earmuff is relatively deep compared with the one-dollar coin.

I love audio network adoptionChargerLAB POWER-Z KM001conducted a wired charging test on FiiO Feiao EH3 NC with a charging power of about 1.7W.

2. FiiO Feiao EH3 NC Dismantling

to the disassembly part, first remove the left snap-in replaceable earmuff.

earmuffs, breathable dust-proof mesh protection.

earphone speaker, a noise reduction microphone in the middle, and a metallic luster of the moving coil diaphragm.

noise reduction microphone small board close-up, the whole small board coated with glue to strengthen moisture.

noise reduction microphone cover black rubber cover protection.

laser engraving MB37 is used to collect internal noise of headphones.

Heat and remove the glass back plate of the earphone, and fix it with double-sided adhesive tape.

back plate is fixed to the earphone by double-sided adhesive tape.

carbon fiber texture.

remove the screws and remove the cover plate on the back of the cavity. Inside the left earphone is the battery unit.

cover is "MCX PC ABS C019" and is made of PC ABS.

cavity, with a small battery and power input board.

battery model 703240, rated capacity 1000mAh/3.7Wh, rated voltage 3.7V.

battery pack protection board adopts seiko protection IC and 8205A battery protection tube.

The front of the power input board is close-up, and more than ten wires are welded, which are connected to the battery and the right motherboard respectively.

power input board, with Type-C charging interface and an input protection IC.

Screen the input protection IC of S9L.

a close-up on the back of the speaker unit cavity, and the wire via hole is sealed with glue.

close-up of the pressure relief hole on the cavity of the speaker unit, covered by a dust net.

cavity.

A close-up of the speaker unit.

According to the actual measurement of my love audio network, the size of the speaker unit is about 45mm, which is consistent with the official publicity.

and remove the right earmuff.

remove the earphone glass back plate.

Remove the screw and open the right headphone cavity.

A list of the internal structure of the cavity cover.

function keys and indicator lights.

Data interface for automatic noise reduction and debugging.

NFC antenna board close-up, wire solder joint glue reinforcement.

A list of components inside the cavity.

noise reduction microphone unit is fixed in a special groove.

microphone is covered with black rubber cover.

laser carved ME37 is used to collect external noise.

cavity to pick up sound during communication.

electret microphone is wrapped with rubber cover and dust-proof sponge.

Close-up of the front of the motherboard.

Close-up on the back of the motherboard.

close-up of LED power indicator, surrounded by black sponge to prevent light leakage.

5 2N7002,MOS tubes, used to drive LED power indicator.

screen printing AD.

BAT54C dual diode.

silk screen printing GJF109.

motherboard, patch soldering.

Close-up of the ANC patch slide switch.

3.5mm audio line interface close-up, patch welding.

printed bluetooth antenna close-up.

ADI adno semiconductor ADAU1777 audio codec x 2, feed forward and feed back microphones feed back the collected noise information to the noise reduction chip for processing. With 4 ADC and 2 DAC, built-in digital processor can perform filtering, level control, signal level monitoring and mixing.

The path from analog input to DSP core to analog output is optimized, ADAU1777 realizing low delay, which is very suitable for noise reduction headphones. Just add a few passive components, crystals and EEPROM for guiding, and ADAU1777 can provide a complete earphone solution.

As far as I love audio network dismantling,Amazon Amazon Echo buds True Wireless Active Noise Reduction Headset,Huawei FreeBuds 3 True Wireless Headset,Bird TRACK AIR Series True Wireless Headsetalso adopted the active noise reduction scheme of adno semiconductor.

ADI adno semiconductor ADAU1777 data map.

ATMEL ATmega88PA is a low-power CMOS 8-bit microcontroller based on AVR enhanced RISC architecture for headphone function control.

With 8K bytes of in-system programmable Flash,512 bytes EEPROM,1K bytes SRAM,23 general-purpose I/O ports, 32 general-purpose operating registers; processor speed 20MHz; programmable watchdog timer with on-chip oscillator, and five power saving modes that can be selected by software.

ATMEL Love Temer ATmega88PA Details.

silk screen 1AM triode.

silk-screen 72K MOS tubes.

Screen the IC of TBJL.

MXIC Wanghong MX25U3235F memory with a capacity of 32M (4M x 8) is used to store headphone information.

MXIC Wanghong MX25U3235F Details.

Screen the IC of AD.

silk screen T4 diode.

Meixin MAX97220A, differential input, direct output line driver and earphone amplifier, built-in charge pump, no external direct capacitor, can get better frequency response, and is used to drive earphone speakers.

Meixin MAX97220A details.

Qualcomm Qualcomm CSR8675 Bluetooth audio system on a chip, supports Bluetooth 5.0, and supports analog and digital pickups.

CSR8675 chip is Qualcomm's first Bluetooth audio system-level chip that has introduced active noise reduction technology, making it the world's first flagship audio solution with ANC function. Support up to 24bit audio and 120MIPS DSP; Integrated dual-mode Bluetooth, Bluetooth audio transmission protocol supporting aptX HD; Support aptX low delay technology.

As far as I love audio network dismantling,products of BOSE, SONY, magic, rambler, vivo and other brands have adopted Qualcomm solutions in large numbers..

Qualcomm Qualcomm CSR8675 Data Map.

FiiO Feiao EH3 NC Noise Reduction Headset with Bluetooth Headset Disassembled Family Guy.

3. I Love Audio Network Summary

FiiO Feiao EH3 NC is relatively simple and fashionable in appearance design, and has complete functionality. Headphones are made of removable and breathable earmuffs, which are easy to clean. The filling in the earmuff headpad is soft and comfortable, and there is no obvious pressure when worn for a long time. The back plate of the earphone shell is made of 2.5D glass, which has a warm hand feeling and unique carbon fiber texture, which improves the texture and recognition of the earphone. The earphone has the functions of folding, turning over and stretching, and can.

On the internal structure, the internal structure of the cavity is clear and the configuration is clear. The left and right ears are equipped with a total of 5 microphones, 4 MEMS silicon microphones and two adeno semiconductor ADAU1777 audio codecs with built-in digital processors to achieve extremely deep ANC active noise reduction effect; the main control chip uses Qualcomm Qualcomm CSR8675 Bluetooth audio system on a chip, supports Bluetooth 5.0, and supports analog and digital pickups; another electret microphone is used for call pickup; the earphone is driven by Meixin's MAX97220A and built-in charge, no output blocking capacitor is required, and better frequency response can be obtained.

A 45mm speaker unit is adopted, and both wired input and Bluetooth input have obtained Hi-Res Audio high resolution certification. 1000mAh large battery realizes long-term endurance for earphones. The battery pack protection board adopts seiko protection IC and 8205A battery protection tube to prevent overcharge and overdischarge of batteries. Built-in NFC Bluetooth antenna can realize wake-up connection in shutdown state. Unfortunately, this product is not equipped with touch operation, which makes it lack some portability.

author:I love audio network09-28 17:56

website: https://weibo.com/ttarticle/p/show?id=2309404554190033650034