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  1. #121

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    Thanks Carl! Hey, you should know you could build two or more pres from the parts found in a Krell!

    You and Ed either stay in the same room here or one of you stays with Jasper in his room. That is a locked down unit after lights out so you'd have to share his litter box too. As for the meth won't it kill the weed growing down there?
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  2. #122

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    Fred, was wondering if I could send you these Acko isolation/reclock boards with parts for the Amanero USB/I2S module. Show me your technique for soldering SMD parts. Video it and put it on you tube. Just do these two......then I'll know how in the future.... Larger board for the dual Potato chips.

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  3. #123

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    Where'd you get that giant dime from, Rich?

  4. #124

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    Quote Originally Posted by SCompRacer View Post
    .... soldering SMD parts.
    That looks like some real fun right there Rich.

  5. #125

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    I was making op-amp upgrade boards for a while and having to solder the SMD's on boards smaller than the dime. Talk about "fun" :^ /
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  6. #126

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    Rich,
    I got a set also! Looks like oven baking is in the works. If I find the solder paste I'll let you know. I don't have much motivation right now due to the great sound I hear with the sdtrans384. I2s and wave files. Computer is used to convert flac to wave. Kind of like making cassette tapes. Ha ha. But sounds way better.

  7. #127

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    The OT got cut so I'll be more rested and better able to deal with the tiny stuff. I just want simple, so the whole point of this excercise will be to see if isolation/reclocking improves the USB to I2S SQ at present. I have no noise/hiss/hum at full volume with no music playing now with the non-isolated Amanero. My expectation is the BIII clock will be better than the Amanero clocks. I could try just isolation too, but the smart folks say transformer or chip isolation alone adds jitter. Might be good to try it both ways.

    The Potato chips are fast and said to handle well above 100Mhz clocks.
    Make yourself necessary to someone. Ralph Waldo Emerson

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  8. #128

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    Rich - How does the Otto work? If I wanted to be able to choose between an S/PDIF input and an I2S input from a USB module what else would I need?
    Wris****ch--->Crisco

  9. #129

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    Ben, the OTTO II is a 2:1 Mux that can switch digital output between two four channel inputs. I use it in my DAC to switch between two I2S inputs. I’ve never used it to switch SPDIF but I think Brian at TP did and it worked. The TP diyaudio OTTO II thread.

    http://www.diyaudio.com/forums/twist...ing-otto2.html

    The only issue I can think of for you is input mapping. That is you have up to four channels of output (1A to 4A) plus GND to connect to your DAC board and how does SPDIF and I2S connect to your DAC board inputs. Your inputs on each channel (1B1 - 1B4 / 2B1-2B4) would have to be mapped to proper 1A-4A output.

    You just add a jumper and pull up resistor to OTTO II and switch it by applying 4-5v. I tried it without the pull up resistor and switching was delayed. I use a mechanical switch in my Denon 3910 to switch OTTO II between I2S and DSD output. The only restrictions are the signals switched can’t be greater than the voltage used to switch it, which shouldn’t be an issue with I2S/DSD/SPDIF. Details are in the Integration Guide.

    http://www.twistedpearaudio.com/docs...ide_V2.0.0.pdf

    If using a micro controller (Arduino or equivalent) they can still pass a small voltage (like .009v) when switched low that kept my OTTO II switched on. I had to add a relay on the one in my DAC. No such issue with a mechanical switch.



    The OTTO II in my DAC connects to a Twisted Pear Sidecar which is between my four channel SPDIF input board and DAC. The Sidecar just has one input and is switched by 5v so I get I2S/DSD input or up to four channels of SPDIF input for a total of six inputs. This was taken before the pull up resistor and relay were added.

    Last edited by SCompRacer; 04-06-2013 at 10:37 AM.
    Make yourself necessary to someone. Ralph Waldo Emerson

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  10. #130

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    Old news, when I built my Twisted Pear dual mono Buffalo III DAC I wanted multiple inputs. I wanted the ability to play SPDIF, I2S and DSD via USB and I2S/DSD (CD/SACD) from my modded Denon 3910. No problem.

    But I got a big surprise along with some other dual mono builders who wanted to play DSD. When you have a DAC board for each channel and wire it as directed, DSD or SACD plays in mono due to a mapping issue inside the DAC boards. However a single Buffalo III DAC plays I2S and DSD/SACD in stereo when wired as directed. I could wire my dual mono to play DSD in stereo but then standard PCM would not play via SPDIF or I2S input. In other words, one or the other via wiring inputs on a dual mono build.

    With no firmware type fix it requires some digital switching. Russ at Twisted Pear came up with a solution using their OTTO II digital switch, but that fix would not work in my configuration. I could live without SPDIF inputs and stick with USB to I2S/DSD, but didn’t want to give up my Denon 3910 input.

    My long delayed fix uses a couple of sealed signal switching relays installed between the Sidecar switching board and the Right and Left channel DAC boards. A standard relay transistor/diode flyback circuit was used to actuate the relays. It offers folks a second working option for a similar configuration.

    Basically I open one circuit to each DAC board and connect it to the other circuit. For DSD, Left channel board, D2 circuit needs to be opened and connect to D1. Right channel DAC board, D1 needs to be opened and connected to D2. With relays unpowered, I can play I2S in stereo, with relays powered, DSD will play in stereo. Hardest part is carefully cutting the ribbon cable apart and snipping/stripping ends. Solder them to the correct relay posts and life is good. For now I flip a toggle switch to select DSD. Over the winter I may look into re-writing code so it’s all automatic when selecting sources.

    Main thing is it works great! No noise added, no SQ loss.
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    Last edited by SCompRacer; 09-15-2013 at 12:23 AM.
    Make yourself necessary to someone. Ralph Waldo Emerson

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  11. #131

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    Oops, wrong wiring image and can't get to advanced edit to change on above post. A glitch since the recent forum upgrade I guess. The revised fix drawing shows more info. 2-5 is just a short jumper under relay but it gets lost if you draw it inside relay. The unbroken D1 and D2 circuit on each side, just strip a 1/8" section of insulation off wire and solder to terminal 6 on relay.

    What I am doing is closing 5 and 6, connecting DSD Left D1 to D2, DSD Right to D2 to D1 to the DAC boards. This ensures left channel plays left, right channel plays right. Note that DSD has a separate R and L data circuit where PCM combines data L and R on one circuit shown as PCM 1/2.
    Attached Images  
    Last edited by SCompRacer; 09-15-2013 at 12:49 AM.
    Make yourself necessary to someone. Ralph Waldo Emerson

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  12. #132

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    Congratulations Rich on figuring out a fix for this troublesome issue. I know others will benefit from it as well. I do not have a dual mono configuration myself, but I know some others on the TP forum do. Great and important fix!
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

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  13. #133

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    Nice fix Rich.Now the next step is to configure that dac for multi ch DSD downloads that will become all the rage.

  14. #134

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    Quote Originally Posted by headrott View Post
    Congratulations Rich on figuring out a fix for this troublesome issue. I know others will benefit from it as well. I do not have a dual mono configuration myself, but I know some others on the TP forum do. Great and important fix!
    Quote Originally Posted by FTGV View Post
    Nice fix Rich.Now the next step is to configure that dac for multi ch DSD downloads that will become all the rage.
    Well it is an 8 channel DAC….but two channels in two channel is plenty for me.

    Thanks for the kind words. Russ isn’t too excited about my fix. He says it isn’t really a fix because nothing was broken. And now the playing DSD in mono in a dual mono config is just the way the ESS chip is designed to operate. Had I known that early on, and I did have a build thread started over there at TP that included the Denon 3910 to export DSD, I could have made the major changes in placement to accommodate his fix. Oh wait, nothing was broken so it’s not a fix…it’s a get DSD to play in stereo in dual mono confg thing.

    His way requires Bit Clock to be run direct to DAC boards due to only four circuits on the OTTO II. That causes issues if you use their Sidecar as it has four "side" inputs, one being Bit Clock. So you'd have to remember to use the Bit Clock output pin on the Sidecar as a data circuit when connecting to DAC boards. If you have SPDIF on the other side of Sidecar, what do you do with that now?
    Attached Images  
    Last edited by SCompRacer; 09-16-2013 at 02:27 PM.
    Make yourself necessary to someone. Ralph Waldo Emerson

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  15. #135

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    Quote Originally Posted by SCompRacer View Post
    .but two channels in two channel is plenty for me.
    I dabbled in multi ch with my Pioneer player but the novelty soon wore off.I can see it working for well recorded classical and other acoustic music for some added ambience fill.For rock and pop no so much.

    Russ isn’t too excited about my fix. He says it isn’t really a fix because nothing was broken.
    Not broken just non functional.Atleast for your purpose.

  16. #136

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    I see questions about multichannel DAC's every now and then so folks are still building them.

    I guess I can see his point about the semantics. A junkie needs his fix, I need my DSD to play in stero fix. Maybe dual mono DSD stereo solution? Nah, it's a fix.

    The mapping thing...images thanks to HifiDuino. One thing I haven't done after the relay fix is try the quantizer settings. That changes how the 8 dacs are combined. My previous just play DSD harness fix just opened the opposite channel circuit per side, that is open right to left channel DAC, open left to right channel DAC. D1 is the key, it's word clock with PCM, Left channel with DSD. I even tried some register 14 remapping in code before this fix.

    Due to using the Sidecar and serial control of DAC, I use no DSD jumpers on board as illustrated. I am the DAC's total boss, do dis, do dat....lol




    Last edited by SCompRacer; 09-17-2013 at 02:14 PM.
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's
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    Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC
    Sennheiser HD650
    Heavy Plinth Lenco L75 Idler Drive
    AA MG-1 Linear Air Bearing Arm
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  17. #137

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    Quote Originally Posted by SCompRacer View Post
    I see questions about multichannel DAC's every now and then so folks are still building them.
    Yeah there is certainly some interest.http://www.computeraudiophile.com/f6...n-mytek-14946/

    A junkie needs his fix, I need my DSD to play in stero fix. Maybe dual mono DSD stereo solution? Nah, it's a fix.
    Well you have done the leg work so if someone else wants to travel the same road you can show them the short cut.

  18. #138

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    Quote Originally Posted by FTGV View Post
    Yeah there is certainly some interest.http://www.computeraudiophile.com/f6...n-mytek-14946/.
    The computer case he's using looks mighty familiar.... oh wait its the one I am using .....
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