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Old 15th December 2009, 12:25 PM   #1601
GerardA is offline GerardA  Netherlands
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@McCrackers,

Just received my Lundahl.
Looks like it can not go directly on the board, wrong orientation
How did you connect it?
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Old 15th December 2009, 12:44 PM   #1602
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I don't have the on board coax RCA anymore so I just put it in line from the coax input with a 0.1uF ceramic cap between the RCA + output and the trafo's + input(leg 2).
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Old 15th December 2009, 12:45 PM   #1603
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Default Lampucera mini DAC

Hi, I found Lukasz Fikusz's pages approx 4 months ago. There are many interesting stuff over there, and I decided to give a try to "Lampucera 1.0" project (because of the cheapest one). After a while, I found this forum, and I am really amazed about this thread too! So, I bought a mini DAC board only, and upgraded the smd parts. The sound of the DAC is great: smooth, lovely, dynamic. The full symmetric version is even better! I steal the signal from L-, L+, R-, R+ points, followed by GE 330 nF/850 V capacitors. The signal goes to a Balanced Bride of Son of Zen preamp (DIY :-). The power source is an 6 V SLB (Sealed Lead) battery with special circuit. The black labeled was made to my friend; the red substitutions are for my version. JŠnos
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Old 15th December 2009, 02:21 PM   #1604
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Quote:
Originally Posted by McCrackers View Post
I see. In that case I'll try without the R. Hopefully I'll notice an improvement.

Theoretically - if I placed one(trafo) on my source(Squeezebox) would the one on the DAC then become redundant? If so I might just remove it and move it over to the SB.
Hi McCrackers,
From everything I read and recent experience, it probably is redundant. I haven't added a trafo to mine but I have added buffers and trafos to my CD sources outputs to great results. It,s a little OT but reclocking the SPDIF output of the player is a much greater improvement than I ever expected.
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Old 15th December 2009, 03:19 PM   #1605
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Originally Posted by Bill Fuss View Post
Hi McCrackers,
From everything I read and recent experience, it probably is redundant. I haven't added a trafo to mine but I have added buffers and trafos to my CD sources outputs to great results. It,s a little OT but reclocking the SPDIF output of the player is a much greater improvement than I ever expected.
Hi Bill,
Wouldn't happen to be a step by step for this procedure anywhere - would there? I don't want to discourage anyone, as the way I have it configured might be responsible, but I've come to the conclusion that the audible benefits achieved with the implementation of a pulse trafo on the DAC's input are marginal at best. However I did read some discussions on other forums(such as this one) where people seemed to be really satisfied with the results. I guess it's a YMMV thing.

Last edited by McCrackers; 15th December 2009 at 03:22 PM.
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Old 15th December 2009, 04:31 PM   #1606
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Originally Posted by McCrackers View Post
Hi Bill,
Wouldn't happen to be a step by step for this procedure anywhere - would there? I don't want to discourage anyone, as the way I have it configured might be responsible, but I've come to the conclusion that the audible benefits achieved with the implementation of a pulse trafo on the DAC's input are marginal at best. However I did read some discussions on other forums(such as this one) where people seemed to be really satisfied with the results. I guess it's a YMMV thing.
Actually, there is a generic step by step for reclocking at Tentlabs website. The installation instructions for their XO2 and XO3 modules is available. You have to replace the clock in the player then pass the SPDIF signal through a 74hc74 then through a pulse trafo. It's a little complicated to cobble the circuitry together but if you use a unit like the XO3 module it's cake, although the XO3 costs more than the dac were using.
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Old 15th December 2009, 04:37 PM   #1607
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As far as audible improvements from using a pulse trafo, I cant see how it could improve anything except possibly better impedance matching. I still think less is more unless there is a real need.
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Old 15th December 2009, 04:52 PM   #1608
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Originally Posted by Bill Fuss View Post
As far as audible improvements from using a pulse trafo, I cant see how it could improve anything except possibly better impedance matching. I still think less is more unless there is a real need.
As a matter of fact - as we speak the DAC is playing without the trafo and as much as it hurts me to say so - I would have to agree with that.

I might like to give the clock mod a go. Can this be done on an SB3?
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Old 15th December 2009, 05:29 PM   #1609
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I would imagine it could be done. I don't have the chops to say for sure, but we're hijacking the thread. Email me and we'll talk.
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Old 16th December 2009, 01:26 PM   #1610
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Default What else after output transformer

I just wondering to those who applying output traffo mod such as Lundals, UTC and others, what else that you can do from here...? Would it be a tube output after the traffo...??? Is this the ending for this DAC board.....???
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