IntroductionTransformer I/V works in pure passive mode without any feedback and active component. It even doesn’t need any power supply. With it, people can build a really nice sound quality DAC at low cost.Different from traditional active I/V solutions, the Transformer I/V plays music very natural and analog and the sound signature is enjoyed by many audiophiles.The Transformer I/V 2027 was recently introduced as a higher-performance upgrade over the standard Transformer I/V version. Transformer I/V 2027 New Features and Specifications● Carefully selected and customized high-performance, low-distortion new Permalloy I/V transformers, optimized for current output mode ESS and other DACs in balanced configuration.● Frequency Response ( @20 Kohm load): 5Hz - 80 kHz +/- 3dB. 20Hz - 20 kHz +/- 0.3dB● Beautiful high-frequency range with very low distortion for a better listening experience.● Precision manufacturing to ensure top level hardware engineering quality Other Features and Specifications● Audiophile grade sound quality but still at low cost.● Has both single end (RCA) and balanced (XLR) outputs. All output connectors are at the same edge of the PCB.● 0dB Output levels. XLR: 4V RMS; RCA 2V RMS● Pure passive mode with zero feedback and no active component.● No need power supply. Simplify the system configuration.● Fully finished. Plug and play. No need any soldering job.● Directly works with both ES9038Q2M Dual Mono and ES9028Q2M DAC HATs. Compatible and swappable with other I/V such as the OPA861. Easy to install.● Vishay/Dale CMF55 series high precision low noise metal film I/V resistors.● Power LED to indicate DAC working status.● Grounding jumpers. User's manual Other documents Note: 1. Grounding jumpers Short both (default): Connect the amplifier GND with DAC GND Open both: Isolated the amplifier GND with DAC GND. May have slight noise when music is stopped. 2. Standoffs. Needs 13mm/M2.5 standoffs and #50B GPIO spacer to mount on top of a FifoPi. 3. If the RCA connectors are not shiny, this does not necessarily indicate a problem with the connectors themselves. It is usually caused by the high-temperature cleaning process used during SMT production and does not affect their electrical connection performance. Application Examples: 1. Audiophile grade high quality ESS DAC at low cost (PCM/DSD) 2. Flagship RaspberryPi SYNC mode ESS DAC with FIFO Re-Clocker (PCM/DSD) 3. Flagship RaspberryPi free SYNC mode ESS DAC with FIFO Re-Clocker (PCM/DSD)(Inputs: USB, Coaxial, OPT, I2S/DSD over HDMI) 4. Flagship Full function SYNC mode ESS DAC with FIFO Re-Clocker (PCM/DSD)
