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DAC-ASH (dac-end 2 up date)

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#443
Some problem with my DAC today, 30 sec after I switched on the DAC, beezing sound "dee" come out from the DAC, like the relay switch on and off quickly, but after I take out one tube(6H30pi), the relay work normal!
I've checked the voltage same as before.
Anyone can help me?
Thanks
 
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#445
Hi all

I tried a couple of times to buy the PCB from Quanghao's www,
but it keeps saying:

"There is no carrier available that will deliver to this address!"

My address is in Denmark ... but i checked, and it said the same to a lot of other bigger countries.

Am i the only one having trouble ordering?
 
#448
Hm, seems that Quanghao is not too ambitious with his projects in the moment...
Unfortunately it is worth to get one of these, as it is really a good performer, when built with the "right" parts...I would try it several times...
 
#450
pedefede said:
Hi all

I tried a couple of times to buy the PCB from Quanghao's www,
but it keeps saying:

"There is no carrier available that will deliver to this address!"

My address is in Denmark ... but i checked, and it said the same to a lot of other bigger countries.

Am i the only one having trouble ordering?
Click to expand...

There are many wrong in the my web!
You can sent to me by e-mail: quanghao168@yahoo.com.vn
Thanks
 
#455
orderd my PCB ...

so i'm sourcing parts while i am waiting. What is the spacing between the holes for the resistors and capacitors?

(Mouser doesnt have 47 Ohm, og 220 ohm in CCF50, so i need other parts there anyway).

and BTW ... what would be candidates the best resistors for digital circuits? - the same as analog audio (shinkoh, Z102, Caddock etc.)?
 
#456
Could easily fit 1/2w resistors like PRP. If you order from Mouser, try Koa Speer 1/4 or 1/2w military series which are rated 500v and 700v respectively. I use the 1/2w ones in my T2 build. For caps, as long as you use the correct values, whatever will fit. Sanyo oscon SP are best for positions around the AD1865. Other places, Panasonic FC/FM or Elna would be perfect.

Best resistors? Definitely the TX2575s. I have 10 of them in my DAC END and all sound sublime. I really don't dig the tantalum ones. Caddock is another great option, make sure you use their top-of-the-line series, TF-USF.
 
#457
Hi Quanghao,

I have the same problem as crazyfrog, I sent you two e-mails to order you pcb of the DAC End + Tube stage but I had no answer of your part.
I am really interested in this DAC and I would really like to realize him it.

Thanks
Fred
 
#458
la1209 said:
Some problem with my DAC today, 30 sec after I switched on the DAC, beezing sound "dee" come out from the DAC, like the relay switch on and off quickly, but after I take out one tube(6H30pi), the relay work normal!
I've checked the voltage same as before.
Anyone can help me?
Thanks
Click to expand...
The relay sounds as a sidewinder does. My case is the same.
because the relay shares the voltage with the filament so the voltage at relay droped under 5v (transformer underfeed it) caused the ralay hesitate to hit. Pls use a 9v/3A one for the instead.
Quanghao claimed that it's due to the voltage drop on LM1084 was not up to 1.8-2v
 
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