This looks awesome !
Is there a BOM/links which parts are necessary ?
Best Regards
Frank
Really nice ;-), is it a temporary case setup or final form... it looks cool.
I'm thinking to try build a Soekris Dac, not so sure which version to go 1021, 1121 or 1941
If you are starting out and want balanced, 1941 without a doubt. There is little need for a DIY'er to go with a 1121 at this point over the newer 1921/1941.
Even without balanced...you can switch via firmware the 1941 to unbalanced and double the outcome...so 1921 only if you want to save money, level is big enough to drive what comes next and you never want balanced...not sure though if a balanced --> unbalnced stage afterwards would not wven give more resolution like in the Sabre DAC where using ful balanced signal information adds up...
Good evening, I've looked at the thread again - somehow I'm still not clear how I come with a raspberry pi3 (volumio) with I2S in the DAC. Has anyone already done that and can say something / help? I think that same problem have some colleagues here...😕
The I2s inputs are in the pin header near the USB connection. They still need to be updated via firmware update, that Soren has said is coming, for they to be of any use.
Thanks for the answer. That is - if I have not read wrong, the second i2s input. That there should be a firmware update, I have also read . But where did the first i2s input hide? Or better asked, which input/header is active when I switch to i2s with the input-pushbutton? I guess I do not see the forest because of the many trees... 🙂
@ sören: is there an appointment for the firmware update?...and is there a guide that goes a bit more into detail???
Best, Peter
@ sören: is there an appointment for the firmware update?...and is there a guide that goes a bit more into detail???
Best, Peter
One would imagine that a single line of code will enable the i2s input...Apparently not enough people are upset.
I find it more curious that so few customers even notice the absence of an i2s input.
Compare this to the nervous anticipation for the dsd conversion update. Cause nothing compares to dsd being masterfully converted to pcm in fpga. After all most dsd material was once pcm anyway 🙂
Compare this to the nervous anticipation for the dsd conversion update. Cause nothing compares to dsd being masterfully converted to pcm in fpga. After all most dsd material was once pcm anyway 🙂
SPARTAN-6 FPGA has limited "capacity".
For example XC6SLX16 in DAM1021/1121 has 14,579 logic cells, 2,278 slices and 18,224 flip-flops.
Each function requires own circuit design, so the "free space" is decreasing with every new function.
Redesign is very frustrating job (for example we have for years an Xilinx project "waiting for redesign" state :-( ), but if no free space for new function (aka second I2S handling), it's unavoidable.
IMHO it would be better not advertising 1941 as second I2S capable device, before this function is available.
euro21, thank you for the explanation, never occurred to me the chip may be running at its limits.
moment ... which input is active when I switch over the input selector switch and the LEDs "I2S" indicate (Green LED D21 on the user interface schematic)? There are 5 input sockets on the 1941-board: USB, AES, COAX, RCA and TOS ... but there are 7 "states", these 5, I2S and Off...the second (not working yet) I2S is probable on J9...
hmpf🙁
That does not look really nice ...
P.6 of the manual:
"The dam1941 can be set for “Parallel” mode, in that case it will be single ended outputs with an output impedance of 313 ohms."
p7 otfm:
"set par=value set paramter to value, set alone to show
conspeed = 9600 | 19200 | 38400 | 57600 | 115200 volume = fixed -80 - +10, line output startup volume filter = linear | mixed | minimum | soft
mode = normal | parallel"