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nezuram  
#1 Posted : Tuesday, July 27, 2010 2:17:39 PM(UTC)
nezuram

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hello! total noob here dreaming to build this great dac!

my occupation is medical, and i do not have the slightest idea about electronic circuits. my last physics class was 10 years ago and i remotely recall anything from it.

the only thing that is driving me to accomplish this herculean task is that i am foremost a music lover, and having heard from peers and reviews how great this dac is, i decided that i need it. and that's why i need your help :)

i have a pc with an asus xonar d2 soundcard that i want to use as transport to play my flac and mp3 files. i want to connect this via spdif to the buffalo dac, hook the buffalo via rca to my amp and headphones.

i have placed my order for a Buffalo-II DAC Module + Placid Power Supply Kit Combo. for my needs, what else is required to build the dac? since i am going single ended output, i just need a ballsie right and a single 9 + 9 transformer? so with these i can already build the dac?

another question: the ballsie has two options for the opamps on board. what are the differences between the opamps? i want the sound to be neutral and faithful so what would you guys recommend?

thanks a lot in advance guys! please help the noob :)
LeonvB  
#2 Posted : Tuesday, July 27, 2010 2:52:13 PM(UTC)
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The basic kit would be a DAC module + Placid PSU + 9V transformer, plus a IVY or Legato + Placid BP PSU + 15V transformer. Both of those I/V stages have SE outputs, you only need a Ballsie if you want a dual mono setup (i.e. 2 DAC modules: 1 left, 1 right) with single ended output. Plus obviously you would need a case, a power + RCA connectors and some wire.
nezuram  
#3 Posted : Tuesday, July 27, 2010 3:53:36 PM(UTC)
nezuram

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oh ok thank you. so no need for ballsie then. will just have to order one 9 + 9, and one 15 + 15 transformer, ivy III kit and placid bp.

so that's what i need from twisted pear. but no 15 + 15 transformer available on the order form. anywhere else i can get that one from?

thanks a lot!
InfiniteGain  
#4 Posted : Wednesday, July 28, 2010 12:25:11 AM(UTC)
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nezuram wrote:
oh ok thank you. so no need for ballsie then. will just have to order one 9 + 9, and one 15 + 15 transformer, ivy III kit and placid bp.

so that's what i need from twisted pear. but no 15 + 15 transformer available on the order form. anywhere else i can get that one from?

thanks a lot!


Transformers are on this site here.
nezuram  
#5 Posted : Wednesday, July 28, 2010 1:47:57 AM(UTC)
nezuram

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thanks! but that's the problem, the 15 + 15 transformer is out of stock. is there a place where i can get something like that so i can prepare my dac build plans?

if ever i wait for the transformer here, how long does it usually restock?

Edited by user Wednesday, July 28, 2010 1:51:15 AM(UTC)  | Reason: Not specified

nezuram  
#6 Posted : Wednesday, July 28, 2010 8:37:04 AM(UTC)
nezuram

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another question guys: if i wanted optical input just for versatility, all i need is add a toslink module to my order? would the toslink module work directly off the dac?

so again: dac module with placid psu kit + 9v transformer + ivy III with placid bp psu + 15v transformer (which is out of stock) + toslink module?

thanks in advance! :)
LeonvB  
#7 Posted : Wednesday, July 28, 2010 10:40:59 AM(UTC)
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In theory, connecting the Toslink module would work as the module goes to SPDIF out and the DAC can use SPDIF in. But it wouldn't make the DAC more versatile, as it would simply replace the normal SPDIF input, not extend it. The ESS chip has several SPDIF interfaces which can be chosen using the registers, but I don't think Russ & Brian have connected them all. So right now if you want to ADD Toslink in addition to other interfaces, you also have to add the MUX unit.
Iniamyen  
#8 Posted : Wednesday, July 28, 2010 2:27:02 PM(UTC)
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I have a DP3T switch that I use to select between USB/optical/coax. They're all digital signals that are being switched, so the DAC output still sounds fantastic.
nezuram  
#9 Posted : Wednesday, July 28, 2010 8:48:57 PM(UTC)
nezuram

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LeonvB wrote:
In theory, connecting the Toslink module would work as the module goes to SPDIF out and the DAC can use SPDIF in. But it wouldn't make the DAC more versatile, as it would simply replace the normal SPDIF input, not extend it. The ESS chip has several SPDIF interfaces which can be chosen using the registers, but I don't think Russ & Brian have connected them all. So right now if you want to ADD Toslink in addition to other interfaces, you also have to add the MUX unit.


thanks LeonvB! that was very helpful. i guess i will be going for toslink for now, but at least i know it's going to eat up the spdif slot...

nezuram  
#10 Posted : Wednesday, July 28, 2010 9:08:48 PM(UTC)
nezuram

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Iniamyen wrote:
I have a DP3T switch that I use to select between USB/optical/coax. They're all digital signals that are being switched, so the DAC output still sounds fantastic.


thanks Iniamyen! i will certainly keep this in mind. will read how to set this up once i get my parts together Angel
nezuram  
#11 Posted : Sunday, August 1, 2010 5:30:16 PM(UTC)
nezuram

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another question guys: assuming i will use an optical module to have an optical input options, would this be better compared to spdif input if the final sound quality is the consideration alone?

my setup has a asus xonar d2 with optical/spdif out. i am planning to use the sound card as transport.

i guess the sound quality will be the same whatever input from the buffalo i will be using... i just wanted to be sure by getting your opinions. thanks!
LeonvB  
#12 Posted : Tuesday, August 3, 2010 2:42:12 PM(UTC)
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That is very difficult to say. Coax will be more versatile, as it's not limited to 24-bit/96Khz. The receiver used in the kit isn't the higher grade (25M) version, propably because that one has a 15 week leadtime (Mouser has 1100 on order, if you're patient you could substitute it). Toslink will obviously give you galvanic isolation from the PC, that can be of value for some setups.
My solution: try both and see what you like best: the toslink module is cheap, and an optical cable isn't that expensive either.
nezuram  
#13 Posted : Tuesday, August 3, 2010 3:34:44 PM(UTC)
nezuram

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oh ok! thanks for the input!

i do have an optical cable left over from a previous setup. might as well do as what you advised and judge with my ears as what is better...

thanks again :)
Russ White  
#14 Posted : Tuesday, August 3, 2010 3:59:03 PM(UTC)
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I prefer COAX (just because you can easily go to 192khz 24bit). If you want galvanic isolation use the MUX. :)
Razzy  
#15 Posted : Wednesday, August 11, 2010 12:14:32 PM(UTC)
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Hi everyone.
I, too, am completely new to this pursuit of build it yourself.
Some more questions.
1. Do I need to solder anything to build this kit?
2. Where can you source a good looking case for the finished DAC?
3. Can anyone provide a step by step guide as to what to do?

I have an Audio Alchemy CD transport I've just bought on eBay. Any advice on tweaking that?
Any mods for a Sony Blu-ray player, also?

Many thanks.

LeonvB  
#16 Posted : Wednesday, August 11, 2010 12:40:54 PM(UTC)
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1. Yes, but it's not very hard to do provided you follow the manual, read the forum and ask questions in the forum as required.
2. I've ordered from www.modushop.biz, the 2U 350mm deep version of the slimline with 10mm front. But I'm throwing a dual mono DAC in the case, with dual PSUs and possibly in the future a CPU board (with it's own separate PSU). For a simple setup one could use something much, much smaller.
3. No, not really as it depends on your choice of setup & components. Populating the boards is easiest done bottom up, starting with the smallest components. If you follow the setup guidelines of the PSU manual and connect things according to the wiring scheme on the site it's less difficult than it looks (but it remains quite a lot of work).
pelliott123  
#17 Posted : Thursday, August 12, 2010 6:02:01 AM(UTC)
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is there an equivalant supplier like modushop in the usa
Brian Donegan  
#18 Posted : Thursday, August 12, 2010 6:22:31 AM(UTC)
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Par-metal.com
nezuram  
#19 Posted : Saturday, October 2, 2010 8:09:41 AM(UTC)
nezuram

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hello! i have received the kit and the 9 + 9 transformers are en route. i have the dac + placid, the ivy + placid bp, and the 15 + 15 transformer, plus the optical kit as as optional input option...

as a total noob, here are my questions:

1) the placid kits need soldering of the capacitors etc. so i place all the caps and stuff onto the board first, trim the extra wire from the back, then start soldering once everything is in place?

2) i should do the same for the ivy?

3) isn't it potentially difficult to mount and solder the dac over the ivy board? i should do this last right? any tips on getting this done with the least amount of hassle?

4) i will be ordering a special aluminum case. can i just build the pcbs and stick them to the case afterwards? or would it be better if i mount the pcbs and make the holes to hold the pcbs in place before soldering anything to the pcbs? any thoughts on this?

thanks in advance guys!
LeonvB  
#20 Posted : Saturday, October 2, 2010 11:19:16 AM(UTC)
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1. You should begin mounting the smallest parts on the board first, usually this means the resistors. Don't mount too much at a time, turning the board up side down gets harder and there's more wire sticking out making it harder to reach everything with your soldering iron. Solder the parts from the underside, and trim the excess wire. Then mount the parts one size taller, etc.
2. Repeat the procedure for each of the modules. With the IVY, I'd start by carefully resoldering all of the pins of the opamps before mounting any other parts.
3. No, it isn't difficult. Mount 1 part on the IVY, and make sure it's vertical. Then mount the DAC on the IVY using both of the connectors, and solder the other 3 pieces. The one that is fixed will keep things under the right angle.
4. When the PCBs are still bare, put them on a piece of ply and mark the holes. Drill the holes in the ply and see if things fit. Use the ply as a template to drill the holes in the aluminium case.
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