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