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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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Old 18th November 2020, 09:28 PM   #8281
smooth dancer is offline smooth dancer  Norway
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Yes, Doede know what he’s doing, no doubt.
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Old 26th November 2020, 03:08 PM   #8282
dddac is offline dddac  Germany
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Default new blog entry on noise measurement (and poll)

off topic....

new thread started with a poll for my blog site
would appreciate your inputs (sorry no prizes to be won )


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Old 26th November 2020, 03:45 PM   #8283
kartick is offline kartick
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Not even a small prize such as a fully built DDDAC with all the bells and whistles??
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Old 26th November 2020, 05:51 PM   #8284
eduard is offline eduard  Netherlands
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Quote:
Originally Posted by SimonJ View Post
Igor04 - proceed with caution! What smooth dancer has done is advanced updates and not simple to do.

The DDDAC by default works off 12v not 10v and smoother dancer has updated his DAC to operate this way and has risks too if you are not experienced.
Hello,
Normally there are 7810 regulators that need around 12 volt to be able to supply 10 volt to the Tent shunts. There have been people here skipping these regulators and supply something close to 10 volt to get a better sound they said.
All these multi F caps contain loads of energy and i am not sure if they will " drain " completely after other parts of your digital set_up already ran out of juice so to say.
You NEED to be sure what you are doing when using these caps. Usually if something goes wrong it will go wrong terribly because there is a lot of current available.
Of course these caps need to be securely attached to the chassis and not the typical diy way using some kind of glue. Of course some planes are partially being glued but they are using exactly the right glue and use it the right way! If you go to a big diy store you can find the right glue probably. BUT i know from my former job that most glues only work with the right preparations. Some glues we used would only work with a special primer. We had to do several test for a special application and just one of the glues would stick after being summited to some force in the first month.
Just imagine that a badly glued supercap would roll around your chassis after being moved around to audiophile friends by UPS. A true firecracker.
Greetings,Eduard
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Old 26th November 2020, 07:31 PM   #8285
SimonJ is offline SimonJ  United Kingdom
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So the next phase of my DDDAC journey begins! Further PSU improvements
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File Type: jpg Battery PSU.jpg (737.4 KB, 179 views)
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Old 26th November 2020, 09:07 PM   #8286
schiirrn is offline schiirrn  Germany
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Quote:
Originally Posted by eduard View Post
Of course these caps need to be securely attached to the chassis and not the typical diy way using some kind of glue. Of course some planes are partially being glued but they are using exactly the right glue and use it the right way! If you go to a big diy store you can find the right glue probably.



https://www.mouser.de/Passive-Compon...z0yhcsZ1z0j00b


Problem solved.
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Old 27th November 2020, 08:07 AM   #8287
dddac is offline dddac  Germany
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Quote:
Originally Posted by SimonJ View Post
So the next phase of my DDDAC journey begins! Further PSU improvements
Nice Simon, would you publish a small sketch how your going to hook up things?
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Old 27th November 2020, 08:29 AM   #8288
SimonJ is offline SimonJ  United Kingdom
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I sure will Doede once it’s all completed
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Old 27th November 2020, 11:25 AM   #8289
ykharlamov is offline ykharlamov
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
It's a very good PSU for DDDAC, especially if two rails are paralleled, but I advise to use it with caution, especially in a test environment.
IMG_1949.JPG

If your batteries somehow discharge below their critical level, an internal short can occur. I experienced this with DDDAC and this PSU. After that, I tested two A123 batteries under controlled circumstances. They do not tend to explode, but they heat to about 220-250 degrees, also they produce smoke and hot electrolyte will leak to the board. In my point of view, several actions needed to made this configuration with DDDAC safe:
1. board is completely covered by heat-resistant varnish (did it).
2. board is completely covered by high temp polyimide foil (did it)
3. battery holders are made of high temp plastic, not ABS (I printed them on my 3D printer, filament -- PC).
4. thermal sensor is placed on the top of each battery (bought all parts, not completed yet).
5. required turn-off time is carefully measured.
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Old 27th November 2020, 11:33 AM   #8290
SimonJ is offline SimonJ  United Kingdom
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Thank you for the tips.

Do you power the Dac with your psu? I won’t be doing that and plan to power only the FiFoPi and Andres clock which are all low power
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