Quanghao,
I don't know what you mean by b connect. Maybe you meant to configure it to SPDIF out, to connect it to your DAC-Ash. How abou the new twisted pear USB to SPDIF conversion board that they're talking about, which I think will be coming out soon? It's a high resolution USB 24/192, would this work also on your DAC? Sorry that I'm asking too much question from you, but I'm curious because I'm always using my laptop as a music server.
Cheers,
Fred
HI!
Some my friend use USB for this DAC!
They do that: USB to SPDIF, they play music from computer!
They said all is works wit 24/192 USB!
I can check it for you some days, Thanks!
I'm not 100% sure the new TPA module would work with this DAC because it's still a couple months behind the schedule. However, I'm using this DAC, fed by the Teralink X2 as my computer music server. Everything works perfectly without any trouble, so I suspect the TPA would work just fine.
I've completed the DAC but my High Volt transformer is overloading and getting too hot. I can get 230V for B+ but R1 is too hot to touch and my rectifier diodes are blowing all the time.
Quanghao, do you have the circuit for DAC ASH and SSHV for I/V. Its different from Andrea's original circuit so I don't know what is wrong.
There is a load somewhere which is overheating my transformer.
Quanghao, do you have the circuit for DAC ASH and SSHV for I/V. Its different from Andrea's original circuit so I don't know what is wrong.
There is a load somewhere which is overheating my transformer.
Question. Why is the heater grounded? Isnt that bad to have 270v potential between heater and b+?
http://www.tubebooks.org/tubedata/HB-3/Receiving-Type_Industrial_Tubes/5687.PDF
Says to have less then 100v between heater and b+
http://www.tubebooks.org/tubedata/HB-3/Receiving-Type_Industrial_Tubes/5687.PDF
Says to have less then 100v between heater and b+
Hi,
the data paper says: less 100V heater to cathode (not B+), the heater is physical in the cathode, the difference heater and cathode are few volts.
Klaus
For all of you who use Computer Audio forget about wasting time and money on USB. I went down this road and a $150 dongle blew my mind and everyone I know in computer audio. Its called the M2Tech and the difference between it and USB with my $500 USB cable is night and day. You can get single ended or BNC. Here's the US importer. M2Tech HiFace USB to SPDIF or BNC InterfaceThe manufacturer is Italian. They sell all over the world.
You see all Circuit in the Page 1 please!
And circuit SSHV for IV
What is the R1=? 22R??
it is not hot!
Attachments
Thanks lil' knight and Pharod for your advise. I'll think about it on those 2 USB options, which I think it will work good on this DAC w/o regrets.
Cheers,
Fred
Cheers,
Fred
how much volts do you have befor and after R11, how much is B+, the power supply is with load?
I'm getting about 115Vdc across R11, that's why it was so host. Anyway the transformer died. One AC is 285Vac and the other is 2Vac. Its burnt I guess, have to get a new one.
I got the R80-36 230V transformer from diyclub.biz. Do I connect both the AC and 0v?
The diagram shows connect 1 AC and 0v.
I got the R80-36 230V transformer from diyclub.biz. Do I connect both the AC and 0v?
The diagram shows connect 1 AC and 0v.
AC = 230v?/ , DC~280v-290v.
R11= 470R, I total ~ 100mA, R 1= 20R
So V on R11= 470 x 0.1mA ~~47V
Why V one R11 or you= 115 V??
im sure there are problem with R1. you can check it please!
Informant!
How about V-out??? Can you tell me please??
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dac board regulators
Well, after I populated the dac board, Only one of the six rails was I able to adjust up to 5v. On the other five rails the max I could get was between 3.5v and about 4.5v.
After checking resistors and if I had messed up when populating the board, I changed resistor values. Even changing R1 to say 10 ohm did little more than an extra .3v. I then started checking the transistors. I first suspected the mosfet Q6 but pulling R6 right out caused over 10v so i continued on checking the others.
To make a long story short I ended up taking the transistors from the good rail and changing them one at a time with the transistors from one of the bad rails. Q6, Q5, Q4, nothing, no change in either rail. Get to Q3, bingo, its like the two rails compelety reversed. Taking the the 2sk170 that was previously in the q3 position in the good rail and putting it into the same position into all of the bad rails, brought those rails into line. After Undoing all the 2sk170 from the dac board and "mixing them around" I was able to get 5 rails up and running, (though a couple do not have a lot of headroom) but I am out of combinations to try and I think I have cooked one or two 2sk170 now. so I will order some more, along with some more bc550's for good measure.
I have a basic knowledge of electronics but this circuit is above me
I guess I have a few questions:
1 2SK170-GR(F) Toshiba JFET
This is the 2sk170 I used, where did you guys source yours from? anyone have the same issues?
2. Is it possible I ended up with a bunch of bad 2sk170's?
3. Are 2sk170's very sensitive to static and heat? I have messed up a couple MOSFET's before.
4. Is the Q3 position on the board the most sensitive to different tolerance values?
5. Would I be best off changing out all the transistors on this board with another set of new ones?
when I was changing the 2sk170's around, I could see the circuit voltage change on my dmm as it cooled down and "settled". some of them settled at diferent values then they were at before, even when the circuit was unchanged other than de-soldering a 2sk170 and resoldering it in the same position.
Any thoughts or advice?
Thanks, Ben
Well, after I populated the dac board, Only one of the six rails was I able to adjust up to 5v. On the other five rails the max I could get was between 3.5v and about 4.5v.
After checking resistors and if I had messed up when populating the board, I changed resistor values. Even changing R1 to say 10 ohm did little more than an extra .3v. I then started checking the transistors. I first suspected the mosfet Q6 but pulling R6 right out caused over 10v so i continued on checking the others.
To make a long story short I ended up taking the transistors from the good rail and changing them one at a time with the transistors from one of the bad rails. Q6, Q5, Q4, nothing, no change in either rail. Get to Q3, bingo, its like the two rails compelety reversed. Taking the the 2sk170 that was previously in the q3 position in the good rail and putting it into the same position into all of the bad rails, brought those rails into line. After Undoing all the 2sk170 from the dac board and "mixing them around" I was able to get 5 rails up and running, (though a couple do not have a lot of headroom) but I am out of combinations to try and I think I have cooked one or two 2sk170 now. so I will order some more, along with some more bc550's for good measure.
I have a basic knowledge of electronics but this circuit is above me
I guess I have a few questions:
1 2SK170-GR(F) Toshiba JFET
This is the 2sk170 I used, where did you guys source yours from? anyone have the same issues?
2. Is it possible I ended up with a bunch of bad 2sk170's?
3. Are 2sk170's very sensitive to static and heat? I have messed up a couple MOSFET's before.
4. Is the Q3 position on the board the most sensitive to different tolerance values?
5. Would I be best off changing out all the transistors on this board with another set of new ones?
when I was changing the 2sk170's around, I could see the circuit voltage change on my dmm as it cooled down and "settled". some of them settled at diferent values then they were at before, even when the circuit was unchanged other than de-soldering a 2sk170 and resoldering it in the same position.
Any thoughts or advice?
Thanks, Ben
I had almost the same trouble like yours. Couldn't adjust the trimpots up to 5v. What I did was simply to desolder all the transistors and resoldered them. Worked like charm.
I'm using 2SK170BL if that makes any difference.
I'm using 2SK170BL if that makes any difference.
Anyone here tried to connect a pair of I/V transformers like the Audionote do in their DACs? Actually I've built a Audionote kit DAC2.1B before, AD1865 CS8414, same as the DAC-ASH, but they use a pair of Audionote's I/V trans connected between the I-out of AD1865(pin 4,21) a 330R resistor parallel with a 820pF cap, and the input of the analog stage a 6922 driver broad, or a 5687 driver broad with transformer couple output!
Very interesting thing is that, we can do at the same way, use a pair of IV transformers!
I did search the web and fround that Swother UK also made IV transformer for current output DAC...
Very interesting thing is that, we can do at the same way, use a pair of IV transformers!
I did search the web and fround that Swother UK also made IV transformer for current output DAC...
I tried on a similiar DAC with cinemag step up mic transformers, didn't work out good. I would be interested in hearing reports of the Sowters, they are expensive but if comparable to AudioNotes would be worth it giving a better load for the DACc chips, should give lower distortion.
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