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Alien DAC v1.1 Construction Thread - Page 40

post #586 of 1560
2/11/07 at 1:04am
I'm also very happy with the Elna Silmic II from digikey.
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post #587 of 1560
2/11/07 at 3:05am
Quote:
Originally Posted by pddjsteve View Post
I'm also very happy with the Elna Silmic II from digikey.
Me to... in fact I preferred them over the Black Gates NX caps.
However the Black Gates FK series are another matter.
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post #588 of 1560
2/11/07 at 3:03pm
Guys, is it still possible to get boards for this DAC?
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post #589 of 1560
2/11/07 at 4:40pm
The final group buy is over. Alf said he will not be doing another. Someone here may have a spare board they are not going to use. Both of mine are built up.

You could have short run of boards made. I don't know if Alf will give out his gerber files for free.
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post #590 of 1560
2/11/07 at 6:28pm
Well, I don't need any more than one board and I figure getting one made would cost a pretty penney. I will look around here and see if anyone has a spare board, but I think going with a different DIY kit would be a better idea.
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post #591 of 1560
2/11/07 at 9:41pm
Quote:
Originally Posted by Whitebread View Post
Well, I don't need any more than one board and I figure getting one made would cost a pretty penney. I will look around here and see if anyone has a spare board, but I think going with a different DIY kit would be a better idea.
BatchPCB charges $10 + $2.50/sq. inch. This is a tiny board. have to double check that this meets their design rules.
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post #592 of 1560
2/11/07 at 10:14pm
O, thats nothing, if I cna get the drawings for the PCB, then I'll just go ahead with this.
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post #593 of 1560
2/12/07 at 2:24pm
PM Alf, he seems like a nice enough guy doing all those group buys for us.

If he won't just give them out maybe ask if he'll submit them for you and you'll make it worth his while.
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post #594 of 1560
2/12/07 at 3:42pm
Just a sanity check here:

With the CL/CR values recommended so high and a little enlightenment recently, I'm thinking of putting the pair of 0.33uF Mundorf MCap ZN caps that I have lying around as the output caps of this thing. All of my home based amps are using either 50K or 100K Alps Blue pots, only a couple of portables use 10K pots so I'll use the 50K value.

That would make the corner frequency formula at

f = 1/(2 * π * 50000 * 0.00000033) = 9.6Hz

If there's nothing wrong with that calculation, I'm on the way to making a new AlienDac for myself
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post #595 of 1560
2/12/07 at 11:13pm
Quote:
Originally Posted by FallenAngel View Post
Just a sanity check here:

With the CL/CR values recommended so high and a little enlightenment recently, I'm thinking of putting the pair of 0.33uF Mundorf MCap ZN caps that I have lying around as the output caps of this thing. All of my home based amps are using either 50K or 100K Alps Blue pots, only a couple of portables use 10K pots so I'll use the 50K value.

That would make the corner frequency formula at

f = 1/(2 * π * 50000 * 0.00000033) = 9.6Hz

If there's nothing wrong with that calculation, I'm on the way to making a new AlienDac for myself
That works with my math. Just remember that though when you use it with your portable and wonder why there is nothing below 50hz
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post #596 of 1560
2/13/07 at 11:59am

BOM Repost

I've had a couple of PM requests for my BOM
It is very close to what others posted in this thread. I made a few changes.

I used an Alternate part for C1. Its on the BOM.


Not on the BOM are the Elna RFS-25V220ME3 caps I used for CR and CL. Digikey part number is 604-1051. They are really not bad, but output caps are a hot topic. I'm sure many people just won't be satisfied with a nine cent part.

C13,23,33 are are 330µF Panasonic FM. Maybe Elna RFS would sound better here. You'd have to live with 22µF though. If I was building a third DAC, I'd give them a try on the Analog side of the DAC.

I recommend getting extras of all the 0805 parts.
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post #597 of 1560
2/13/07 at 1:39pm
Quote:
Originally Posted by AndrewFischer View Post
I recommend getting extras of all the 0805 parts.
or don't drop them on the floor....
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post #598 of 1560
2/15/07 at 2:08am
Well, it seems those output cap values are definitely a little higher than necessary. I'm now using 0.33uF Mundorf MCap ZN's in mine and it sounds fabulous. Pics in the signature
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post #599 of 1560
2/15/07 at 4:29am
Quote:
Originally Posted by FallenAngel View Post
Well, it seems those output cap values are definitely a little higher than necessary. I'm now using 0.33uF Mundorf MCap ZN's in mine and it sounds fabulous. Pics in the signature
Umm, can you compare with electrolytics?
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post #600 of 1560
2/15/07 at 11:14am
Quote:
Originally Posted by Yen View Post
Umm, can you compare with electrolytics?
Not really, lets just say that even though the BlackGate NX-HiQ sound nice and warm, there really is no comparison in quality. These blow them out of the water.
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