Same mogućnosti tog DACa su poprilično široke.
The dam1021 is a DAC module based on a discrete R-2R sign magnitude DAC design, with FPGA based FIFO buffering/reclocking and custom digital filters, < 1 ps jitter clock generator, with 28 bit resolution so there is headroom, oversampling up to 3.072 Mhz. Up to 24 bit / 384 Khz input from SPDIF, I2S and USB (via USB to I2S interface board), with isolation on the I2S interface. The board is very flexible, with digital volume control and filter parameters that can be downloaded. The board is fully firmware upgradable over a simple serial connection, which enables new features later on. For now we plan to add digital crossover filters soon.
The basis R-2R network has an output voltage of 1.4V RMS and output impedance of 625 ohm and can therefore drive a lot of things directly. There is also onboard balanced output drivers that can drive high impedance (>= 300 ohm) headphones directly. The power supply is also onboard, just add a 5W+ toroid transformer.
INITIAL FEATURES
The initial release (“v1) of the firmware together enables the following features:
- I2S input up to 384KHz sample rate (tested to 192KHz)
- SPDIF input up to 192KHz (tested to 96KHz)
- Automatic De-emphasis for 44.1KHz material
- Built-in set of simple FIR filters for all sample rates
- Digital volume control through simple potentiometer
- Automatic input selection
- Data reclocking: s/w PLL with 0.02 Hz low pass filter
- S/W interface (serial interface) allows:
- Volume control (e.g. with Arduino and RS232 interface)
- Input selection (e.g. with Arduino and RS232 interface)
- Loadable FIR filters including bypass filter for NOS support (s/w utility included)
- Firmware update/upgrade
Upcoming features (through user-performed firmware upgrade)
- DSD support
- Filter cascading for digital crossover
- Filter cascading for balanced use
- Master clock output
- 4 FIR1 filters for each sample rate selectable through the serial port with a default selection (#2)
- Linear Phase
- Medium, optimized mix between Linear Phase and Minimum Phase
- Soft, mostly Minimum Phase but not that good alias rejection
- No filter, also called non oversampling, no alias rejection
- Improved response for FIR2 filter which will be modified to be pretty soft….
- Enabled TTL-level serial port on the isolated side (3.3v)
- Rather than incremental updates, Soren is planning a big update [link]
http://soekris.com/products/audio-products/dam1021.html
https://hifiduino.wordpress.com/2015/01/30/building-soekris-r-2r-dac/
http://www.diyaudio.com/forums/vendors-bazaar/259488-reference-dac-module-discrete-r-2r-sign-magnitude-24-bit-384-khz.html
PCB sam kupio, XMOS USB I2S konverter također, trafo je naručen u Sv. Nedjelji, potenciometar za digital volume control imam.
Čim mi sve naručeno dođe (PCB je došao danas, prema tracking numberu), krećem u realizaciju, sklapanje i lagano igranje istim.
Can't wait
P.S. Ne kažem da je dizajn savršen, koji to uopće jest?!, no, poprilično me zainteresiralo ovo.
Šteta što nije i on neradni 