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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 KHz

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G

Greg Stewart

Member
Joined 2003
Paid Member
First, many thanks Peter for your response. That helps a LOT!

With that info, I can work out how to reposition my regulators to fit separate ones for the FPGA and the clock. I'll probably retain the current dual LT3045 one for the FPGA and other chips and use a single LT3045 (or even an LT3042) for the clock.

I may have more questions on the super-reg mod. I'll find the different examples in the thread and ask specific questions if needed.

I find the results to your FIFO experiment VERY interesting. I have two DAM setups running, one fed directly from an SDTrans384 and the other from an RPi -> IsolatorPi -> Kali reclocker stack, which works VERY well. I DID find adding the Kali and then later the IsolatorPi both to be upgrades in my setup. I suspect the Kali (which is is a 45/49 clock version) is outputing an I2S stream very similar to that of Ian's FIFO, so I'm curious what is working differently in your trial.

Androa76, I am running a very early firmware, the last one before DSD was enabled. Sorry, I don't remember what filter, it is one of Paul's filter sets from the website he hosted for awhile. I'll try some of the more recent ones at some point, but have other things to do first (like the clock regulator!). Luckily I update mine from a laptop, so I can at least take the computer to the DAC.

Greg in Mississippi
 
G

Greg Stewart

Member
Joined 2003
Paid Member
Peter,

I just checked the Si514 datasheet and the max current draw is <50mA, so I won't have to wait for some LT3045 boards, I can use some of the LT3042 boards I have on hand.

Still working on some other projects, but I'll be slotting this one in ASAP!

Again, thanks for the info and assistance!

Greg in Mississippi
 
TNT

TNT

Member
Joined 2003
Paid Member
The diyinhk is not a fifo in the same sens as the Ian one as it has no memory to digest the difference between 2 asynchronous clock domains. It's a recklocker. And if Sören is correct, it should not matter if you use one or not.

//
 
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H

henrylarsen

Member
Joined 2011
Has anybody experience with the MiniDSP NanoSharc and the DAM 1021 board. I can only find one reference from BE718, who apparently did not experience the problem described below

Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz

My problem is that this combination creates dropouts. I have tested the Soekris board, it works fine with a Raspberry as I2S source with the same connection, so no problem with the DAM. The dropouts is very short, and happens from every 2-4 and up to 60 seconds. Any ideas?
 
K

Keetesyflush

Member
Joined 2018
Hey folks, looking for some advice with my dam1021 build. Here is some info upfront:

- Amanero Combo384 USB to I2S
- DIYINHK Toslink receiver
- Audiozen AZ lite
- dam1021 rev 5

Basically everything works great - no issues locking to either I2S or toslink and the AZ lite works just fine. However, I get nothing out of the raw or buffered outputs.

So far I've checked the following:
- measured the J2 headers. Seem alright and measures correct voltages. Also I get +/- 11V from pwr a+ and pwr a-, which is about right considering I'm feeding 12v DC to the dac.
- No problems locking to signal from either the amanero or toslink. auto select works fine. AZ lite displays the correct bit rate, etc...
- Ohms seem alright for the buffered and raw outputs.
- I've upgraded and downgraded firmware. Currently just using 1.06, but I've tried 1.19.
- Checked wiring for the outputs a billion times.
- Tried different rca/xlr jacks.
- Made sure my amplifier was alright. It is.
- Messed around with various things in uManager like manually setting volume and stuff. When I start up the dac this is the output from the serial connection:

Code: 
R1.06
I3
L000
F4
V+05
I3
I2
L044

- read probably all 760+ pages of this thread :eek:

Basically I'm at a loss. It seems like every output is just muted and I can't figure out if that's the case and I'm missing something obvious or if there is something wrong with my board. Any tips on anything further to check? I can post pictures of anything too if that'd be helpful.
 
F

Faboz

Member
Joined 2018
Keetesyflush said:
Hey folks, looking for some advice with my dam1021 build. Here is some info upfront:

- Amanero Combo384 USB to I2S
- DIYINHK Toslink receiver
- Audiozen AZ lite
- dam1021 rev 5

Basically everything works great - no issues locking to either I2S or toslink and the AZ lite works just fine. However, I get nothing out of the raw or buffered outputs.

So far I've checked the following:
- measured the J2 headers. Seem alright and measures correct voltages. Also I get +/- 11V from pwr a+ and pwr a-, which is about right considering I'm feeding 12v DC to the dac.
- No problems locking to signal from either the amanero or toslink. auto select works fine. AZ lite displays the correct bit rate, etc...
- Ohms seem alright for the buffered and raw outputs.
- I've upgraded and downgraded firmware. Currently just using 1.06, but I've tried 1.19.
- Checked wiring for the outputs a billion times.
- Tried different rca/xlr jacks.
- Made sure my amplifier was alright. It is.
- Messed around with various things in uManager like manually setting volume and stuff. When I start up the dac this is the output from the serial connection:

Code: 
R1.06
I3
L000
F4
V+05
I3
I2
L044

- read probably all 760+ pages of this thread :eek:

Basically I'm at a loss. It seems like every output is just muted and I can't figure out if that's the case and I'm missing something obvious or if there is something wrong with my board. Any tips on anything further to check? I can post pictures of anything too if that'd be helpful.
Click to expand...

Hi,
I had issue with shift register see here https://www.diyaudio.com/forums/ven...magnitude-24-bit-384-khz-745.html#post5490732

The Board hard some shorts and bas been fixes by soekris.
Did you try without sk lite ? And with only one input connected ?
 
B

bmxmen

Member
Joined 2012
I have bough New Xmos witch fifo reclocer and BIG OLED display , have connected it to soekris dam1021 dac384khz. Im useing foobar with resampler. Before i nad an amanero 384khz usb i2s source and resampler was seted on 352800khz sound was very good. When i chaned amanero to xmos ani with fifo reclocer trying to set on 352khz it was no plaing, soekris dac dont have i2s connectionn so trying 384khz with same results.only plaing max on 192khz i have seen on display that xmos probybly plays even 384khz but Why soekris dont seen it? Amanero was seen it on 352khz. I have download free newest driver. Mayby Fifo reclocer. Reclock it x2 so dac see not 192khz but 384khz
 
K

Keetesyflush

Member
Joined 2018
Faboz said:
Hi,
I had issue with shift register see here https://www.diyaudio.com/forums/ven...magnitude-24-bit-384-khz-745.html#post5490732

The Board hard some shorts and bas been fixes by soekris.
Did you try without sk lite ? And with only one input connected ?
Click to expand...

Ah, I do remember seeing your post. I'll try measuring those registers. I've also tried without the sk lite and still no dice. Now that I'm thinking of it, I haven't tried using only toslink. I'll give that a go too.
 
B

bmxmen

Member
Joined 2012
Hello Again i have modded soekris to Lifepo4 powering but have an problem,dac plays but very silent and dirty. I have disolderet 5v Regs, 3.3v reg and 1.2 switcher, reference 4v opa some of The electolitic caps, one resistor near clock. And buffer. I have Done one mistake,but think it is not big mistake i have soldered in wrong place gnd from shift,clock and fpga. On yellow i have Markt my wrong gnd. But i have changed on upper pad where capacitor have minus. But stil dac plays very silent and dirty. Did i have killed him? I have 4 bateries for each of shift rail, one batery for clock and fpga(fpga have 1.2v reg) , one batery for isolators, two bateries for xmos, and two bateries for oled display. Please help me.
<a href=https://zapodaj.net/a5cb7df0fefbd.jpg.h ... 930.jpg</a>
<a href=https://zapodaj.net/793452d0a2de2.jpg.h ... 819.jpg</a>
 
analog_sa

analog_sa

Member
Joined 2002
analog_sa said:
So, here is the question: why not give the clock a separate regulator?
Click to expand...


Got an answer: a Salas Bib makes a pretty big difference as a dedicated clock regulator. More low level detail, longer sustains, very nice.

Today i tried some cheap Chinese LT3042 boards for the 1.2v (previously a 1084) and the 3.3v in place of Salas. The 1.2v was fine, but the 3.3v was a big step down, sounding perhaps even worse than the original shared 3.3v reg on board.

Replaced quickly all the ceramics on the 3042 board with OSCONs. No difference.

Well, at least i tried :)
 
K

Keetesyflush

Member
Joined 2018
Ok, so quick update from my troubleshooting. I measured the shift registers and got some really wacky voltages back. Really low, like +/-0.4v on all 4 rows.

Well, I ended up hooking up directly to an 8vac transformer instead of the 12v power supply I was using and it worked! Everything, including the shift registers, measured correctly and I got glorious sound!

So, pretty sure the power supply is the problem. Got a different one arriving in a few weeks and hopefully will be in business.

Thanks so much for the pointers. Measuring the shift registers was what got me on the right track :)
 
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