Specifications

As shown above, the digital audio can enter two USB and S / PDIF coaxial signal (blue arrows), from the front panel select switch Digital signal input through the DAC digital decoding, the decoding of high resolution, up to 113dB dynamic range, converted to a pure analog signal (green arrows) Analog signal through the amp circuit, through the OPA2604's polish and polish, the signal amplification and add flavor, push the headset.

PCM2707 is a band S / PDIF stereo digital output of the single-chip full-speed USB sound card solution, this program without the help of software code, is a full hardware decoding of the program, the maximum sampling rate of 48KHz, SNR 98dB, because it is  a complete hardware decoder chip, PCM2707 totally unnecessary drivers, plug the computer USB port, the system will automatically identify, without any set and movement itself can be automatically cut off the old sound card work, pull out the USB port, the system will automatically restored to the original sound card work.

BB PCM1793 same company produced the exact DAC decoder program, is a digital conversion chip with 192K/24BIT, move range up to 113db, the total harmonic distortion plus noise is only 0.001%, the program used in many high-end amplifiers, Perhaps you do not know its name, but excellent music experience is brought about by it, PCM1793 is the core of this open UDFi Yue, PC USB connection from the PCM2707 link to the pure digital S / PDIF music signal is to get it PCM1793 digital to analog conversion for money.

BB produced by the same company Yue UDFi DIR9001 used in the open, DIR9001 role is to capture S / PDIF signal, it can receive 28KHz to 108KHz sampling rate, 24bit signal, DIR9001 the jitter value is only a very small 50, apart from PCM2707 to a digital signal, you can add other devices S / PDIF signal access to open Yue UDFi, that is, by DIR9001 to receive, and then into the PCM1793 to achieve decoding.

Function:
USB Sound card parts:
——USE BB PCM2707;
——USE I2S way;

DAC DAC parts:
——USE BB PCM1793
——192K/24Bit
——113db

AMP parts:
——USE BB OPA2604

S/PDIF output:
——Use DIR9001
——USE I2S way
——jitter(ps)=50
Features:
Frequency response: 10HZ --- 20KHZ (-1dB)
Distortion AC: 0.01%
Headphone output: 0.05%
Headphone output level: P-Pmax: 10V
Headphone output matching impedance::16 ohm --- 600 ohm
Line Output Level: 2Vrms
Input Power: DC12 1000mA
Input: S / PDIF × 1 USB (2.0) × 1 RCA 1 set
Output terminal: RCA 1 group 6.5MM headphone jack × 1
Dimensions: 16cm X 12cm X 4.5cm
Weight: 1500 g