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View Poll Results: Surface Finish for future PCBs
ENIG - Electroless Nickle/Immersion Gold 51 43.97%
Immersion Silver 35 30.17%
Immersion Tin 18 15.52%
OSP - Organic Solderability Preservatives 12 10.34%
Voters: 116. You may not vote on this poll

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Old 6th February 2012, 07:13 AM   #801
Pocoyo is offline Pocoyo  Indonesia
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hi studiovesius

im interested with
-DDNF pcb's + psu pcb's
-Teralink X2
-DDDac SPDIF to i2s module
are they still available

pm sent
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Old 18th February 2012, 02:15 PM   #802
acccruz is offline acccruz  Portugal
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I take the salas shunt and the TDA modules (if it are red barons version).

Thanks
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Old 18th February 2012, 03:16 PM   #803
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Pm answered
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Old 24th February 2012, 11:50 PM   #804
neda is offline neda  United States
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Well after many months of planning and building I've finally finished, and I must say it sounds absolutely stunning. This is the closest I've come to reproducing the sound of quality vinyl.

I couldn't have done it without the help of you Oliver, you're the best!

There is one problem I'm having. When the unit is sitting idle, and the preamp is turned up to full volume, there is a fairly loud hum/hiss. This is not normal for my system, it is normally dead quite.
If anyone can give me suggestions of how to eliminate this noise I would appreciate it.

I will be posting some finished photo's very soon. I tried earlier, but I encountered an upload problem.


Ned
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Old 25th February 2012, 08:47 AM   #805
regal is offline regal  United States
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Quote:
Originally Posted by neda View Post
Well after many months of planning and building I've finally finished, and I must say it sounds absolutely stunning. This is the closest I've come to reproducing the sound of quality vinyl.

I couldn't have done it without the help of you Oliver, you're the best!

There is one problem I'm having. When the unit is sitting idle, and the preamp is turned up to full volume, there is a fairly loud hum/hiss. This is not normal for my system, it is normally dead quite.
If anyone can give me suggestions of how to eliminate this noise I would appreciate it.

I will be posting some finished photo's very soon. I tried earlier, but I encountered an upload problem.


Ned
Did you check for 0DC offset on the output ?
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Old 25th February 2012, 05:52 PM   #806
neda is offline neda  United States
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Hi Regal,
Look's like that's probably my problem. I thought I checked it, but I guess I didn't.

With the unit connected to a cd transport, from a cold start, I get 12vdc. As it warms up it gradually settles down to a varying 275-300mv, both channels the same, and it's not steady. The voltage constantly climbs and drops.

I'm using Russian K75-10's bypassed with FT-3's for the output caps, when I put my finger on the outer case the hum gets very loud.

I tried uploading photo's again, but it still won't let me.
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Old 25th February 2012, 10:58 PM   #807
regal is offline regal  United States
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Two things,

I figured that the mk7 design isn't really correct as far as allowing DC coupling. Sounds like you are using output caps which is good, but configuring the correctoutput signal ground needs some re-work, I just ordered my PCB so probably not much help but.

Your caps can't be having 275-300mV DC on the output of the cap, my guess is you are using the wrong ground for the output. Check it against a true ground (I would use your preamp rca input signal ground as a self check)

The other thing when you have got truly 0VDC on your output you may still find you need to grind some paint off the russian caps, many of us have found the these caps need to have their cases anchored (solder a wire from the case of the cap to star ground.)
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Old 25th February 2012, 11:42 PM   #808
neda is offline neda  United States
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Quote:
Originally Posted by regal View Post
many of us have found the these caps need to have their cases anchored (solder a wire from the case of the cap to star ground.)
I was actually thinking of doing this in the past.
Thanks for the input.
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Old 11th March 2012, 03:34 PM   #809
neda is offline neda  United States
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Here She is!
Attached Images
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File Type: jpg dac3230.jpg (118.3 KB, 428 views)
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Old 12th March 2012, 06:48 PM   #810
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What a beautiful build! Chapeau
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