I have the red board and 4 decks. I consider buying the blue board. Anyone here who have changed from red to blue, and did that change improve SQ ?
First chassis for PSU arrived. Time for a little tease :-D !
Why radiators? There will be psu for dac and comp. For comp is a big one and heats up much. I was planning to put all heating components on the radiators though. Will see if it works.
Why radiators? There will be psu for dac and comp. For comp is a big one and heats up much. I was planning to put all heating components on the radiators though. Will see if it works.
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I am currently in the process of upgrading from the 1794 motherboard (red one) to the 1794S motherboard (blue one).
I ask you for a tip: I do not manage to unsolder the red motherboard from the vertical cables that connect the 4 DAC cards to the motherboard. Even the use of the Desoldering station does not solve the problem because there is still a little solder remaining in the holes and the cables remain "sticked" to the mother board.
Is there a way to unsolder them properly ? or do I have to cut the vertical cables, and then add a short portion of cable to make the link with the new motherboard ?
Thank ou very much for your reply !
I ask you for a tip: I do not manage to unsolder the red motherboard from the vertical cables that connect the 4 DAC cards to the motherboard. Even the use of the Desoldering station does not solve the problem because there is still a little solder remaining in the holes and the cables remain "sticked" to the mother board.
Is there a way to unsolder them properly ? or do I have to cut the vertical cables, and then add a short portion of cable to make the link with the new motherboard ?
Thank ou very much for your reply !
Try
a - suck the tin from both sides of the board
b - you need a help of another person while you are melting the tin on wires, ones one is lose an another person slowly pulls them out from the holes using pincers
or c - cut all of them, unsolder all of them and replace all of them for new ones (entire lenght wires - best silver wires)
Use good tin sucking pump or good quality desoldering wick.
Good luck
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I've re-soldered my 4 board stack about 10 times by now and have all the holes cleaned within about 30min. The way I do it is, I have a small rotating bench vise (+/- 1,5Kilo) that I clamp the edge of a board into, so it stands up vertically. That way i can grab the component or wire on one side with a pair of small plyers and use a desoldering iron on the other side of the board. Besides, I cut all the interconnecting wires between the boards before I start and thread through full length new ones when I reassamble the stack just like you would with a new build.
Hope that helps,
Hope that helps,
OK, I have tried some 130 ohm Vishay naked foil resistors in my one board dddac and I like the results, as others have reported, in comparison to the Audio Notes I had before.
But 130 ohms is giving me 2.65v on the outputs rather than 2.7v. As I'm using the CCS mod on Pin 20, do I simply leave this voltage as it is, or should I adjust the CCS trim pot to give me 2.7v again?
Thanks
David
But 130 ohms is giving me 2.65v on the outputs rather than 2.7v. As I'm using the CCS mod on Pin 20, do I simply leave this voltage as it is, or should I adjust the CCS trim pot to give me 2.7v again?
Thanks
David
Hi Sovereign1, I can see you are using different types of electrolytes. Did you do some sound testings and trials with different capacitors before you employed this layout? Or is just more of a guess?
I'm very curious of any findings with unregulated psu and capacitor's choices, and how it influences the sound. Most of all I'm curious about these mundorfs MLytic AG. I use them in my amp and they sound fantastic. I was thinking to use them also in a dac. The only thing that I'm not sure, is that voltage range of the mundorfs is 63V. Has that some negative influence on power delivery of 12V supply? Or is ok to use them with no problems?
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How do they sound? Did you compare them with different caps on your dac?
Thank you smooth dancer
Do NOT adjust the CCS board. The PCM1794 is a current output device. The same current into a lower resistance will result in a lower voltage. 2.65V is what you should be getting into 130 ohms.
Ross
I've had good luck using low temperature solders that are used to remove surface mount parts. Search for ChipQuik. You melt some of this low temperature solder onto the joint that you want to clean up and it stays liquid for a long time. This makes it easier to remove with solder wick.
---Gary
Check VCom voltage it should not be more than 4v
Varying CCS draw changes VCom and output voltage so best to leave CCS values at 400ma I've burned a few chips testing the boundaries
If you think there's a little distortion at 2.7 v rload
Best to use lower value r's to reduce
Hi mate, it was what what was in stock at the time, sounds fantastic to me, but then I have nothing to compare it with.
The psu is soon to change though as I have just ordered six BMC 10,000uf capacitors. I had some advice given to me today by a well-established powersupply expert who visited my house and looked at the unregulated power supply, he gave me some excellent advice regarding resistors et cetera which I will also implement. I have no idea what it will sound like but at least I have a reference to compare it with now. I must say I'm very impressed but the difference is that an unregulated powersupply makes
The psu is soon to change though as I have just ordered six BMC 10,000uf capacitors. I had some advice given to me today by a well-established powersupply expert who visited my house and looked at the unregulated power supply, he gave me some excellent advice regarding resistors et cetera which I will also implement. I have no idea what it will sound like but at least I have a reference to compare it with now. I must say I'm very impressed but the difference is that an unregulated powersupply makes
I think they sound very similar to the Elna Cerafine. Clean and detailed without beeing to analytic. But I am a guy who prefer the Cerafine instead of the Silmics that so many others like. The Silmics is over the top warm and "cosy" for my taste.
Thanks smooth dancer and Sovereign1.
I actually thought the same way, therefore I tried this combination with my amp lately. First stage was small Cerafines, and last power stage Mundorfs.
I placed my post about this here:
http://www.diyaudio.com/forums/power-supplies/261836-some-electrolytic-caps-shootout-2.html
As the mundorf itself are great, they didn't work too good with cerafines and naighter with muse alone. That's why I was very curious about different combinations with mundorfs as a protagonist. Still I'm going to pair them with these silmics and see what comes out. Muse itself and even mixed with cerafines gives too much of the highs to my taste.
Did anyone tried raw psu with Panasonics FM? I would be happy to hear your findings.
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Hi James
I'll sketch out the PSU and get a picture up tomorrow. Obviously when I string it together we will see how it sounds.