That would be greatly appreciated. As long as it's possible to solder a wire in place with my Stone Age soldering station I'm happy. 🙂
(30 something years old Weller...)
(30 something years old Weller...)
dam1231 / inputs (i2s...) are isolated?/ balanced dual?
@soren,
Can we assume inputs are isolated? i2s ?
Can 2 boards be used, each set to L/R and balanced output be obtained?
Max sample rate is dependent on RPi clock?
Board can be powered with off board 5V supply?
@soren,
Can we assume inputs are isolated? i2s ?
Can 2 boards be used, each set to L/R and balanced output be obtained?
Max sample rate is dependent on RPi clock?
Board can be powered with off board 5V supply?
Last edited:
Great to hear those specs @soekris
What will be the trade-offs of the new DAM1231? Meaning, what is being removed or downgraded respect the DAM1021 in order to provide a plug-and-play board?
Thank you
What will be the trade-offs of the new DAM1231? Meaning, what is being removed or downgraded respect the DAM1021 in order to provide a plug-and-play board?
Thank you
From what Sœren said earlier, it seems the RPi board will be a HAT for the Pi. Very limited DIY for no0bs who want plug and pray functionality. If you want balanced signal out I expect you'll opt for what I'm talking about earlier. Extract the RAW signal and run it through a phase splitter. It being a HAT there will be no way to mount the second board.
Clock wise I would expect it to work like the others using its internal oscillator?
I would never assume to speak for Sœren but this is what I gathered from what's been said previously.
Maybe the oem version is a better route if you want two boards synced?
Personally I like the new PS option to run it off of the RPi. Now you could focus on providing one good 5V PSU for the Pi and be done with it. I also like the foresight to prepare for a IR receiver so you get a remote control. Now, will that remote control the Pi or the dam volume? If it's a GPIO pass through it'll be controlling the volume on the Pi. Will we still be able to use the 1231 volume control? I could probably get some interesting use from having both functional but it's no deal breaker by any means.
Clock wise I would expect it to work like the others using its internal oscillator?
I would never assume to speak for Sœren but this is what I gathered from what's been said previously.
Maybe the oem version is a better route if you want two boards synced?
Personally I like the new PS option to run it off of the RPi. Now you could focus on providing one good 5V PSU for the Pi and be done with it. I also like the foresight to prepare for a IR receiver so you get a remote control. Now, will that remote control the Pi or the dam volume? If it's a GPIO pass through it'll be controlling the volume on the Pi. Will we still be able to use the 1231 volume control? I could probably get some interesting use from having both functional but it's no deal breaker by any means.
Last edited:
You can in principle run balanced like a dam1021, but the mechanics and wiring will complicate things, you might as well use dam1021 or dam1121.
Sample rates will of course be what it's feed from the RPi, max PCM 384K / DSD 256.
There is a std DC plug and an internal header for external power to both the dam1231 and RPi, need to be powered by that if you want to use the onboard power management.
Cut down to 25 bit R-2R network, no isolation on I2S as the RPi have isolated network interface. SPDIF coax is isolated, toslink is per definition isolated.
Improvements: R-2R clocks bypass FPGA, Analog power is generated by DC-DC converter but then regulated by discrete low noise low impedance "super regulators", like 1uV and 3mohm from DC to Mhz....
The IR input goes to the FPGA/uC, could be routed to RPi, so firmware support will probably not be there in first version, not a priority, more like something to play with later on....
Otherwise volume is supposed to be controlled by the RPi and/or the rotary encoder, with right RPi firmware by both.
Last edited:
Sounds great. The rotary encoder can be used as setting a "max volume" and then use the Pi for regular volume control. But it's like you said, not a priority. It's just one of those things that provide a little extra value once you have it up and running. 🙂
Love that you're implementing good power regulation on board, that makes life so much easier. You will literally be able to run it off a wall wart without degrading the sound quality, that's just awesome. I'm looking forward to playing with it.
Love that you're implementing good power regulation on board, that makes life so much easier. You will literally be able to run it off a wall wart without degrading the sound quality, that's just awesome. I'm looking forward to playing with it.
Do you have the final dimensions of the board yet?
I ask because you mention it is slightly larger than the RPi, I'd like to see if certain cases are going to be compatible.
Will it be possible to order the DAM1231 without the RCA jacks, for use with hook-up wire and chassis mount jacks instead?
I'm thinking of using the forthcoming MoodeCase among others that utilize chassis mount RCAs.
Hi I just buy a DAM 1021 rev 4.
I have doubts on USB to I2S card to buy.
On all DIYINHK cards specs, it is written :
7) PCB uses external 3.3V(>150mA) regulated power supply, it is usually connected to the same 3.3v digital power DAC is using
So considering powered the card with 3,3V from DAM 1021 PCD card is a non sense because it will ruin the isolation, power can only been taken from an other independent supply or from USB 5V bus with a regulator (or external supply)
Am i right ?
Amanero is ok with USB Bus supply and it has an 3,3V external supply (for isolator). Are they limitations with this card with DAM1021 ?
Do you know how much mA need dirt side DAM1021 side ?
Thanks for you help.
B.
I have doubts on USB to I2S card to buy.
On all DIYINHK cards specs, it is written :
7) PCB uses external 3.3V(>150mA) regulated power supply, it is usually connected to the same 3.3v digital power DAC is using
So considering powered the card with 3,3V from DAM 1021 PCD card is a non sense because it will ruin the isolation, power can only been taken from an other independent supply or from USB 5V bus with a regulator (or external supply)
Am i right ?
Amanero is ok with USB Bus supply and it has an 3,3V external supply (for isolator). Are they limitations with this card with DAM1021 ?
Do you know how much mA need dirt side DAM1021 side ?
Thanks for you help.
B.
DIYINHK USB cards do indeed need separate and isolated 3.3V power supplies when used with the DAM.
Amanero is an excellent choice for the DAM. I can't pick a clear winner between DIYINHK XMOS and Amanero. I own both.
Amanero is indeed just fine working from USB power but still most people mod it to power it externally. I'm not sure whether doing that with the DAM will make an audible difference, I haven't tried it.
The dirty side of the DAM's isolators needs just a few mA of power.
Amanero is an excellent choice for the DAM. I can't pick a clear winner between DIYINHK XMOS and Amanero. I own both.
Amanero is indeed just fine working from USB power but still most people mod it to power it externally. I'm not sure whether doing that with the DAM will make an audible difference, I haven't tried it.
The dirty side of the DAM's isolators needs just a few mA of power.
My previous dac es9018 did not have isolation, so i have an intona isolator that does reclok too and works very well.
The intona 5v ouput is max 600ma and maybe not the best.
Maybe i should replace it with a regen or w4s recovery reclocker ?
Do you think a reclocker is needed upstream the dam isolator ?
B.
Last edited:
actually the intona is clocked from the dirty side of its pcb 😕
so its not implemented as we would like
so a cleanly powered clocked usb hub or regen will have benefit
the new xmos u216 diyinhk usb to i2s (384 and 768khz) seem to be better than previous generation and the amanero
usb isolation and reclocking is far more effective than i2s isolation
😕
I don't understand.
Intona does a good reclock (<12ps), and regenerates its own ground and 5V from upstream 5V (but isolated from it). It isolates the usb signal too.
Regen or W4S R will have a cleaner new 5V (if supply is clean),with more mA, but no signal isolation at all.
Good to know... (...why ?)
Considering all of this i think i am going to keep the intona ...
B.
Last edited:
Because the chips used for galvanic isolation add jitter, by re-clocking after the isolator jitter can be reduced to very low levels if good clocks and power supplies are used.
Ok. Not sure that was the reason for nigel2000 pov.
Does the fact that a dac is masterclocked is a different thing from a signal reclocking (on the same board and downstream the isolator) or is it the same ?
I am working in a full isolated digital chain with lifepo4 batteries supplies so each new supply is work and $ ...
purely subjective I've heard all devices in various senarios you can then investigate why that might be
The intona is powered via usb which is bad no matter what way they dress it up the oscillator (just above the spartan chip on dirty side) is powered by this on the PC side of the isolating chips meaning the output side is been clocked from the dirty side through the isolation chips the power is transferred via transformer and will suffer all issues except for the isolation factor it still will be noisy
Anyway fpga is not a good way to clock it will induce jitter they should have put a clocked usb hub on output
just put another cell in parallel with an existing 3.3v rail and use that for usb to i2s and the i2s isolators on soekris
spel about diyinhk usb to i2s
1) The latest xmos xCORE-200 includes unique hardware divider and it is used to generate bit-clock from master clock directly.
2) The XMOS used in this pcb is XU216 2000MIPS and it contains two tile. It is equal to two XU208 combined in one silicon chip, one dedicated tile is used for the USB data and the other tile is dedicated to process the audio data to the DAC
isolation primarily is to isolate the noise maker pc from the dac
it would seem that a lot of the damage has been done by the time the signal has been converted to i2s and isolating i2s is like bolting the stable door when the horse is gone
isolating and reclocking via usb hub or regen type devices is a better way
Last edited:
I heard both ways of powering it. Clean external power makes a difference, even with the reclocking and buffering dam...