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Old 19th April 2013, 10:06 PM   #51
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I made a few changes: Made the tracks a bit thicker (0.64mm) fixed a connection to pin 14 of AD1865 that didnt exist, moved the regulator closer to analog +5v supply of the IC and also made a board without Mic5207 regs for experimentation purposes. I will probably etch and build the boards on monday hoping that alligning the toner transfers wont be a huge pain(also hoping that the boards actually work! ).
Attached Images
File Type: jpg 24bitIout.JPG (61.6 KB, 244 views)
File Type: jpg Iout192khz.JPG (65.3 KB, 234 views)
File Type: jpg IoutNoReg.JPG (38.9 KB, 221 views)
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Old 20th April 2013, 08:12 AM   #52
JLOP is offline JLOP  France
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Nice to see its going well Skouliki ! I let you explore the thing
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Old 6th May 2013, 08:33 AM   #53
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Any progress here?
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Old 6th May 2013, 08:24 PM   #54
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I etched the dac board and the psu board . Assembly is almost complete but it was slow because im having some health issues lately. Cant say for sure but im probably gonna finish by the end of the week
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Old 6th May 2013, 10:57 PM   #55
JLOP is offline JLOP  France
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Hi Skouliki
Take care first, science can wait (;-)
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Old 14th May 2013, 08:28 PM   #56
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I run into a problem today. I soldered all regulators and went ahead with testing their voltages. The regs for positive supply all work ok, giving V+ 4.97-4.98V.
The regulator for the negative supply is measuring V+ 0.6v and gets very hot to touch. (By the way, the pictures i posted show the negative supply reg wired wrong)
I am using two seperate transformers to feed the regs with the ground pin of the negative supply reg as V-, and the Vout pin connected to ground plane.Am i overlooking something?

Edit: All regulators are positive
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Old 15th May 2013, 06:35 AM   #57
marce is offline marce  United Kingdom
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I think you need a proper negative regulator.
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Old 15th May 2013, 01:28 PM   #58
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Quote:
Originally Posted by marce View Post
I think you need a proper negative regulator.
Tried two mic5207's and a 78l05. The same result, all get very hot and give 0.6v+ . Im going to buy a 79l05 tomorrow to give it a try hoping it works. Im still puzzled though why is this happening
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Old 21st May 2013, 02:06 PM   #59
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Using an 79l05 reg the dac works perfectly. Wired it today and sounds really good although using such a noisy reg for negative supply.Now i have to find a low noise negative reg with high-ish input voltage.I changed the layout of the board to reduce the number of slots in the ground plane. Picture quality is bad and the dac is a mess in its current form (long wires, uncut boards ,etc)
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Old 21st May 2013, 03:06 PM   #60
JLOP is offline JLOP  France
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Getting well Skouliki, great !

Question to the clocking and IV experts :

- If I was to connect 3 of these DACs to I2S out of Najda Digital XO, should I do something to synchronize properly the 3 DACs/avoid jitter (eg share the same clock ...)
- What is the best IV for these boards ? Zen/Cen/Sen ? (I have tube SRPP on my Raindrop board that work great, I could also duplicate them)

BR
Jean-Louis
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