Дискретный R2R дак
http://www.diyaudio.com/forums/vendo...t-384-khz.html
помоему довольно интересная штукаI have been working on a little side project, now it*s time to present it for everybody here....
It*s a DAC module based on a discrete R-2R sign magnitude DAC design, with FPGA based reclocking and custom digital filters, < 1 ps jitter clock generator, with 28 bit resolution so there is headroom, oversampling up to maybe 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 will be very flexible, with digital volume control and filter parameters that can be downloaded, a possibility is also to add digital crossover filters, but that will probably not be ready for first production lots, although the board is firmware upgradable over a simple serial connection.
The basis R-2R network has an output voltage of 1.4V RMS and output impedance of 1.2 Kohm 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.
It is a small mostly surface mount PCB, and yes, I have working prototypes, see below.... But it*s not really something for home assembly, with the FPGA in BGA package and 600 pcs SMT parts.... So yes, if there is enough interest it will go into real production, with sales though two existing online shops in US and EU.
Performance of first prototypes using 0.05% resistors is better than expected, see 1 Khz -1 db and -60 db FFT plots. I believe that the sound quality will be the absolute best, better than any Delta Sigma DAC, in class with discrete DAC*s from totaldac and msb technology. And for way way less cost
Update on Aug 6:
Thanks for all the nice words and interest. The board will definite go into production, leadtime on the precision resistors is the limiting factor, I*m trying for a ship date of early to mid November for the first batch of 240 boards, then more boards in December. Planing for about 25% 0.01% version, 50% 0.02% version and 25% 0.05% version. Preliminary pricing is:
0.05% resistor version USD 170 / EUR 127
0.02% resistor version USD 240 / EUR 179
0.01% resistor version USD 350 / EUR 261
Shipping cost and any local taxes to be added.
They will become available to order though two existing webshop (no info there yet):
с демократичной ценой.
сделано вполне аккуратно.
Сообщение от cka3o4nuk
Включил ее совсем не по даташиту, получив выход по напряжению прямо с матрицы.
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