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Schiit DACs (Bifrost and Gungnir down, one to go)? The information and anticipation thread. - Page 60

post #886 of 3320

Terrific stuff, Andre - thanks!  Nice to understand a little more about what I'm looking at.

post #887 of 3320

Yeah thanks a ton, Andre - very insightful for those of us without the required knowledge to know what we're looking at.

 

I think I posted this earlier in this thread or the other one in the Sponsor announcements board, but I had asked Jason a month or so ago via e-mail about Schiit's transformer choice of EI transformers versus toroidal (or even R-Core/C-Core), which seems to be the most popular transformer choice in modern DACs, his reply being:

 

 

Quote:
Reed,

Yeah, transformers get down to more of a religious discussion sometimes, but, bottom line: why would you want a transformer that bleeds more high-frequency hash back onto the AC line (like a toroid or R-core) in a DAC?

EI's the way to go for power (or C-core.)

Toroid or R-core is the way to go for output coupling (for tube amps.)

That's how we see it.


Jason Stoddard
Co-Founder

http://www.schiit.com
(323) 230-0079

jason@schiit.com
- Show quoted text -

 

 

post #888 of 3320

Here is a marked up picture of the Bifrost guts:

 

https://lh4.googleusercontent.com/-2TrqKGI5Wck/Tozqi11MeII/AAAAAAAABDg/CVE4phAX_Tk/bifrost.jpg

 

edit: fix up the transistor text to say it's 1 of 8.

 

edit: here is an updated picture pointing out the two LEDs on the analog board, and one more crystal on the USB board: https://lh4.googleusercontent.com/-yZIzBrpRx-I/To4WTkP72QI/AAAAAAAABD0/A8K4L_T_F0Q/bifrost.jpg


Edited by AndreYew - 10/6/11 at 2:03pm
post #889 of 3320
Thread Starter 
Quote:
Originally Posted by AndreYew View Post

Here is a marked up picture of the Bifrost guts: [...]


That is awesome. I added it to the first post - I hope you do not mind!

post #890 of 3320

Good work AndreYew. We knew the USB board was plug in, but what suprised me was the audio board being a seperate module.

 

It looks like this audio output board will be used in the mid range Schiit DAC as well, but with balanced outputs using those extra pins.

post #891 of 3320

Thanks Andre.  I was impressed this morning when I read your commentary of the board design.  I dont know much more than what's a capacitor and whats a resistor so it is great to have someone explain the build.  The annotated photo is really great.

 

It will be interesting to see how Schiit goes with the modular designs.  We already know that they have shared components and chassis for their amps to date and the Bifrost.  We also know that the Bifrost will have upgradeable modules -USB and Dac at least.  I am guessing that the need for the larger chassis will stop the upgrading from going too far.  ie taking a bifrost to a balanced output.

 

I am still really impressed with Schiit.  Even the wait for the Bifrost is not even dampening my excitement.

 

Bring on the announcement of the intermediate Dac and Amp and then the Statement Gear.  I wish Schiit all the best in their business.

 

 

post #892 of 3320

Aren't those LEDs right behind the TOSlink?  

 

The only other time I've seen LEDs on a PCB not for illumination was for quick glance diagnostics.

 

Yes, very helpful Andre!

post #893 of 3320

I notice there is a toggle switch for on and off at the back of the chassis but at thew same time it looks like there is a button on the front. Wonder what it does 

post #894 of 3320
Quote:
Originally Posted by justie View Post

I notice there is a toggle switch for on and off at the back of the chassis but at thew same time it looks like there is a button on the front. Wonder what it does 



I believe the toggle is for power, and the button up front is for selecting between inputs (USB, Coaxial, S/PDIF).

post #895 of 3320

I think the rear toggle switch is power on/off. The front button select from the three inputs, and the 3 led's at the edge of the mainboard are the visual light for each of those inputs. The other internal LED's must be for diagnostic?

 


Edited by agisthos - 10/6/11 at 6:07am
post #896 of 3320

Midweek update for everyone (well, kinda past midweek . . .)

 

Our lives at the boardhouse are winding down. I can now say we will be shipping a handful of Bifrosts on Friday, another handful on Monday, and will have good supply as of Tuesday. 

 

Apologies again for the delay.

post #897 of 3320

Great news, thanks for the frequent updates. Hopefully that means those of us with USB will be getting charged last part of next week?

post #898 of 3320

Yep, USB should start shipping midweek and have good supply by the end of the week. 

post #899 of 3320

"we will be shipping a handful of Bifrosts on Friday, another handful on Monday"

 

Bifrost impressions should start trickling in next week then beerchug.gif

post #900 of 3320
Quote:
Originally Posted by Hero Kid View Post

That is awesome. I added it to the first post - I hope you do not mind!


 

Not at all --- I'm glad people find it interesting.  I've added a couple more things to it.  For example, there are two yellow LEDs in the analog output stage --- I know diodes are sometimes used as references, so perhaps this is another way of doing it?  Also, there is another clock crystal, for a total of 3, on the USB card.  Here is the new pic, and I've kept the old one so I don't break any links:

 

https://lh4.googleusercontent.com/-yZIzBrpRx-I/To4WTkP72QI/AAAAAAAABD0/A8K4L_T_F0Q/bifrost.jpg

 

edit:  the connector from the DAC board to the main board has 24 connectors.  Probably some are grounds, and some are power supply lines but there are more than enough pins to implement some kind of differential transmission of the digital data to the DAC itself especially if they're doing just 2 channels.  That would be 4 pins for the differential audio data, and 20 leftover for plenty of ground and power-carrying capacity.  Some might be unused for future expansion, too --- it's hard to say without the board in hand.


Edited by AndreYew - 10/6/11 at 2:09pm
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