HiFi DAC Preamp

Technical Specifications

I. Function & Control

·         Main Control: MCU microcontroller control

·         Input Switching: Coaxial (COAX), Optical (OPT), USB, I²S, Bluetooth (BH)

·         Features:

o    30-level output level fine-tuning

o    Digital filter switching

o    Power-off memory function

o    Full-function remote control support

·         Display: Upgraded LCD with white text on black background

II. Interface Specifications

·         Input Interfaces:

o    Gold-plated RCA input/output connectors

o    25MHz bandwidth optical receiver (supports 192kHz)

o    USB (Amanero solution, Italy)

o    IIS (non-HDMI interface, supports dedicated digital transports only)

·         Output Interfaces:

o    RCA single-ended output (2Vrms)

o    XLR fully balanced output (4.2Vrms, U.S. standard: 1-Ground, 2-Hot, 3-Cold)

III. Hardware Configuration

·         Oscillator: 0.1ppm high-precision temperature-compensated active oscillator (independent voltage-stabilized power supply)

·         Op-Amps:

o    Dual op-amp OPA1612A×2, single op-amp OPA828×2

o    Zhengling precision gold-plated op-amp sockets

·         Power Design:

o    Fully sealed toroidal transformer (zero vibration/leakage)

o    Fast recovery rectifier diodes

o    Rubycon + Nippon Chemi-Con audio-grade capacitors

·         Voltage Regulation:

o    13 independent voltage stabilization modules

o    ES9038PRO core power: Linear Technology LT1963A + ADP151-3.3

o    Op-amp power: LM317BT/LM337BT

IV. Audio Performance

·         DAC Chip: ES9038PRO

·         Dynamic Range: ≥128dB

·         Total Harmonic Distortion (THD): 0.0005%

·         Frequency Response: 20Hz-30kHz (±0.08dB)

·         Channel Separation: >110dB

·         Signal-to-Noise Ratio (SNR): 2117dB (original value, suspected typo)

V. Supported Formats

VI. Protection & Compatibility

·         Protection Circuit: Imported signal relays for power on/off protection

·         Power Filtering: MEI Filter (reduces mains interference)

·         Voltage Compatibility: 110V/220V toggle switch (default: 220V)