Cayin RU7 dongle amp/1bit-DAC

Fully Balanced Resistor Networks Discrete 1-Bit DAC for DSD Format     Purposively designed micro-miniaturized 1-bit DAC circuit from discrete components   Convert digital signal to analogue signal through a fully differentiate 4-ch DAC architecture The 1-Bit DAC circuit is a resistor network composed of 128 pcs (4 x32) high  precision Thin Film Resistors, this is closely resemble to the discrete DAC of our N7 DAP The output of the resistor network will go through a 3-level active LPF and then converted to single-ended signal for volume adjustment.  Dual amplifiers in parallel,  providing 4-CH high power  Balanced Driven output   The second phone amplifier  is a parallel unity gain  inverting phase amplifier An impressive upgrade in  phone output power : 3.5mm SE, 160mW @32Ω 4.4mm BAL, 400mW @32Ω Shared Line Out Conveniently Connected   The shared line out function will  configure the 3.5mm or 4.4mm  phone output into fixed voltage  output (bypassing volume control): 3.5mm Single-ended, 1.2Vrms 4.4mm Balanced, 2.4Vrms   The line out voltage are carefully  selected to retain as much details  and dynamic of the 1-Bit DAC with  minimum noise and distortion.    Enable you to connect the RU7 to  portable/desktop amplifier or home  audio system and used it as an  miniature 1-Bit DAC  Discrete Volume Control   Discrete Resistor Network DAC circuit is very demanding on incoming data integrity,  we recommend users to keep the digital volume of mobile phone at full output to  safeguard the quality of audio digital signal.    When off-the-shelf analog  volume options cannot meet high  precision, low noise, low power  consumption requirement of RU7,  we developed our own discrete  resistor network volume control    100 steps volume control through  3 segments of resistors and  switching relays *,  offer precise control over  a wide volume range,  satisfy even the need of  most sensitive IEM users: Segment 1: 1-49 Segment 2: 50-79 Segment 3: 80-100        Outstanding Digital Audio Capability with   User Selectable All-to-DSD   RU7 supports PCM up to 384kHz and native  DSD from DSD64 to DSD256. Its Audio Bridge will receive different audio format and  go through high precision signal enhancement.   All digital audio signal will convert to designated DSD format (DSD64/DSD128/DSD256) before feeding to the discrete 1-bit DAC circuit.   Dual PCB to Minimize Interference      To minimize interference, RU6 circuitry  is split into TWO 6-layers PCB, with  digital and analog circuit  installed in separate  boards.   Safeguard signal integrity, make  sure the noise from reference clock  and DSP will not bleed into  amplification circuit. Functional Diagram for RU7 1-Bit Dongle DAC   Low Power Consumption Compatible with Common Platforms     Discrete resistor network is a low-power DAC circuit when compare to other highly integrated DAC chipset, minimize power drain from mobile source. Redesigned amplification  circuit increase  output power dramatically  while maintains the overall power drain at 100-110mA Low power consumption allows RU7 compatibles with the following digital audio sources:  • Android  based mobile devices • iOS and  iPad OS mobile devices • macOS computers • Window 7/8/8.1/10 computers • Digital Audio Players with USB Audio output An All-Rounder Bundled Protective Case     Soft and tender handmade  magnetic leather case  Custom make for RU7,  precise cutout  offers tight-fit protection  and elegant presentation  Two circular metal plate with  adhesive tape pad are included. A Compact and Nimble Powerhouse     Weight:  25g , small enough to slip  into your smallest pocket Dimension: 66*24*12 mm     Package List:  ① RU7 Dongle DAC  x1 ② Type-C cable  x1 ③ USB A to C adapter  x1 ④ User Manual  x1 ⑤ RU7 Protective Case x1