IHIFI-812V2 WM8740 24bit/192KHz 8GB internal AMP Portable HiFi Music Player

Description
 
IHIFI812V2 top portable music player (built-in WM8740 decoder, AD8397 amp)to create the mostserene
background, clear, sweet, wide sound field the sound!Portable audio player line system, while not
complex, but the difficulty is to do, such   as the signal to noise ratio improved from 70db to 90db,
probably as long as one day, but from 90db to 95db upgrade may take 3 months. Each capacitor model,
each resistor, and even the direction of each signal line, we have done a lot of experiments, only
pcb design proofing has reached more than 10 versions. Even at the cost of raw material, widely used in
the industry's top components.

 Amp: rail-to-top high-current op amp AD8397, the output current of up to 300MA, 69MHZ    
  bandwidth, 25 ohm load switching speed 53V/US.

 Actual audition the sound quality excellent

the only drawback is the large consumption of this chip affect the system life.

 HIFI812V2 Right Mark Audio Analyzer test report
 Testing chain: External loop (Line Out - Line) Sampling mode: 16-bit, 44 kHz
 Frequency range: +0.07, -0.61
 Noise level, dB (A): -99.4
 Dynamic range, dB (A): 91.3
 THD,%: 0.0018
 IMD +%: 0.0090
 Stereo separation, dB: 82.3
 IMD (10 kHz),%: 0.008

It has a built-in rechargeable Li-ion battery that can be charged only through 12V dedicated charger.
 While connecting to the computer, the battery cannot be charged through USB line.
 
 IHIFI812V2 Earphone output power: 450mW/16 Europe; 225mW/32 Europe; 99mW/150 Europe; 50mW/300 Europe.
 Storage capacity :8GB built-in
 Extended storage: Mini-SD/TF card( can expansion up to 32 GB)
 Analog output: LINE output and HEADPHONE output
 Battery Type: Lithium Polymer electromagnetic
 Life time: 12 hours long standby, depending on the sampling rate changes
 Charging time: 1.5-3 hours
 
The main structure:
Audio coupling: muse goddess art (two)
Filter: Sanyo Solid State (five)
Main filter: Philips Silver Blue Shell
lpf capacitor: Panasonic SMD film (5%, not an ordinary soldering iron)
Amp: ad8397ardz(High-current rail to rail op amp)
Decoding: WM8740(one)
lpf: ad8672
Src: ad1896(11.2896 local clock, shaping and frequency stabilization
 
Specification
 Net weight: 0.28kg
 net volume: 118 * 75 * 26mm (excluding knob)
 Packing size: 80 * 100 * 140mm
 2.4-inch color TFT LCD
 Supported operating system:Windows98/SE/ME/2K/XP,Mac OS 10,Linux2.4.2
 Operating environment:-5 to 40 °C

  Supported formats: WAV APE FLAC AAC WMA OGG MP3 while the perfect cue file support (will lead
to varying degrees of noises, and even make the product cannot play, please guarantee the download
music files of MP3 player are excellent without damage)