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Old 25th March 2010, 06:26 PM   #1241
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[QUOTE=quanghao;2130993]
Quote:
Originally Posted by Joshua_G View Post
Guanghao,
You still didn't reply my questions about the prices.
How do you expect people to send you money when they don't know the exact amount they should send?

I repeat my questions:

As I understand, the prices are:
PCB- DAC END = $15
PCb Salas shunt for DAC=15
PCB- I/V stage = $15
PCB- Supply for I/V = $15 ( Now i dont have it, i make it later, you can use Salas shunt for IV stage)

no! i need 50$ for:
1 PCb DAC + 1 PCb Salas shunt for DAC + 1 I/V stage + shiping + free paypal.
Supply for I/V you can waite me some day later!
thank you!
Quanghao
This is very confusing.
Please post here exactly which PCBs you have and their prices, a detailed list of the PCBs and the price of each PCB. Also, the expected date of availability and the price of the PCB that you don't have right now.
Without it it's impossible to make an order.
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Old 25th March 2010, 06:30 PM   #1242
Salas is online now Salas  Greece
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Quote:
Originally Posted by adamus View Post
i am using 11r (3 * 33r).

my guess is, 3r the tranformer is stuggling and 20r+ there isnt enough shunt current for the regulator to be optimal.

anymore than 20r and i cant adjust to 5.5v
So It was a right assumption, current was robbed with not enough left to the shunt Mosfet? Wasn't tested for current consumption as a an original total system it seems. Super reg Stax style shunts aren't free feed series. They will not just provide beyond CCS. Not difficult to grasp, but forgotten.
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Old 25th March 2010, 06:51 PM   #1243
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It works, perfect. I will have my mates round later to assess the sound, as i'm far too biased .

No really, it does sound great. The only criticism is the temp of the 2.2r (which has been discussed) and the temp of the 2 ic's on the I/V supply board, however i have them on massive heatsinks, so apart from those things which are easily overcome, it's been relatively easy to build. I followed the designs bit for bit except i used 2x27r on the digital shunt and i bridged both 2k and 1k at R11 on the I/V supply.

I need some time to assess the sound, and consider the reliability, which i will of course report back with.

Thanks to everyone for your help, or input into the great DAC.
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Old 25th March 2010, 07:52 PM   #1244
noizas is offline noizas  Lithuania
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Quote:
Originally Posted by quanghao View Post
no, i need 50$ for:
1 PCb DAC + 1 PCb Salas shunt for DAC + 1 I/V stage + shiping + free paypal.
Supply for I/V you can waite me some day later!
thank you!
Quanghao
Hi Quanghao,

Let me know when I can send 50 USD to your paypal account.

best wishes
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Old 25th March 2010, 08:07 PM   #1245
adamus is offline adamus  United Kingdom
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Quote:
Originally Posted by agithegreat View Post
It works, perfect. I will have my mates round later to assess the sound, as i'm far too biased .

No really, it does sound great. The only criticism is the temp of the 2.2r (which has been discussed) and the temp of the 2 ic's on the I/V supply board, however i have them on massive heatsinks, so apart from those things which are easily overcome, it's been relatively easy to build. I followed the designs bit for bit except i used 2x27r on the digital shunt and i bridged both 2k and 1k at R11 on the I/V supply.

I need some time to assess the sound, and consider the reliability, which i will of course report back with.

Thanks to everyone for your help, or input into the great DAC.
Good stuff. if you have heatsinks on the salas shunts, i would be tempted to solder another 27r in parallel to the two already there.
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Old 26th March 2010, 01:09 AM   #1246
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Joshua_G!
Now those PCB stay in my house!
PCB DAC
PCB-Salas shunt for DAC
PCb-I/V stage
So i like you use The Simpler Simplistic Design by Salas for the I/V stage

the price:

1 PCb DAC + 1 PCb Salas shunt for DAC + 1 I/V stage + shiping + free paypal.
$ 50.
Do you understand ??
Quanghao

noizas

You cane sent now. Do not forget write nick name on diyaudio.com in to the pay pal
thank!
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update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 26th March 2010, 01:13 AM   #1247
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agithegreat, can you show some pictures of your DAC? I'm interested to see what kind of caps you throw in your DAC board.

Cheers,
Fred
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Old 26th March 2010, 03:03 AM   #1248
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Here's a few for you. I have just gone for any old thing to start with, then later i can play with to my hearts content to get what i like.
Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.

I have found something very annoying though, when there is silence i get a quiet twitching noise. It's completely random and sounds like a quiet clicking noise, very fast and random. It does it even when i unplug my input and the unit is on, which leads me to think it's on the analog side of the chip, or it's in the I/V stage.
Anyone take a guess what it is?
Just like a scratching noise present all the time, but when music is playing it's not audible.

Last edited by agithegreat; 26th March 2010 at 03:05 AM.
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Old 26th March 2010, 03:25 AM   #1249
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Great work!
Many many transformer for DAC!
What Cap out put do you use???
the sound is not good?? have noise???
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update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 26th March 2010, 03:28 AM   #1250
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I have fixed the noise. By connecting the middle earth point on the I/V board to "true" earth. Now it sounds perfect.

I used very cheap output cap, not quality at all, but now i have it working i can go ahead and change the parts i skimped on for better ones.
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