DAC-ASH (dac-end 2 up date)

[quanghao]

Hi Quanghao,

I have Toroid Transformer T120 120W 0-200-260-300-360V(100mA)x2 6.3V(2A)x2 5V(2A), can use 6.3 + 5 =11.3V for filament or is it too high ? Also, can we replace R11 470Ohm 5W with power inductor 10H ?

Regards

You can use 0-200 /100ma for HV
A. About the HV
1. 200 x 1.28 = 256VDc, Use R11 in board IV down 220 R/min 5W, For tube 6h30Pi

2.If you use Chocke change R11, it is ok,
Thus IRF9160 will receive approximately 40V, it will be hotter. You should note heat for it, because I total about 90-99mA, if you use 6h30 or 6h6.
6dj8 is no problem

B Filenment
The AC for filament , it is Hight
EX: (11.3 x 1.4) -2=13.8V, We need 6.3VaC. So 13.8- 6.3 = 7.2V, through Lt184
about 10.8W, heatsink is very hot, and need biger!
You can not use it,

Filament need 7- 8VDC/ min 2A for tube 6h6, 6h30

 

[klaju1955]

Would the R-Core cover both DAC and I/V stage? or I would need another one for the tube I/V stage?

It´s better you use seperated trany for digital and analog

 

[lucylu]

Hi Quanghao Please advise 1uf 450v c2,c3, on s/s and c17 c23 on i/v can i replace with 400v


Thank you for help john

 

[quanghao]

Hi Quanghao Please advise 1uf 450v c2,c3, on s/s and c17 c23 on i/v can i replace with 400v


Thank you for help john

Hi! yes sir. that is fine!

 

[lucylu]

Hi All Any comments on spdif transformer on Dac-end T2 bom says Newava s22083 or ll1572. Does this have any great impact on sound quality ? ll1572 is approx 3 times cost of other thanks john

 

[tube_man88]

I have on hand Pulse Engineering PE 65612, will I be able to substitute with this ?

Thanks

 

[quanghao]

I have on hand Pulse Engineering PE 65612, will I be able to substitute with this ?

Thanks

yes!

 

[quanghao]

some image DAC-end 2 by my fried

 

[parodielin]

Chips

For three chips, I can source AD1865N-K and CS8414 from 0755china. How about the 74HC04?

Any good sources on sockets? 28pin, 24 pin, and 14 pin.

Thanks!

 

[parodielin]

Hi wushuliu and morpheous !

this shop you can by all Transfomer for DAC:
DIYCLUB

or this link by one member, Post 1970 by BudP
http://www.diyaudio.com/forums/quan...0-old-thread-dac-end-andrea-ciuffoli-197.html

Would the R-Core Transformer in the link work for Dac End 2? The Salas shunt has six AC saying 9-12V. Does the 100W R-Core have six inputs? How to tell?

Thanks!

 

[quanghao]

Would the R-Core Transformer in the link work for Dac End 2? The Salas shunt has six AC saying 9-12V. Does the 100W R-Core have six inputs? How to tell?

Thanks!

You choice 2 transformer for DAC, On transfomer not have 6 out put!

 

[parodielin]

You choice 2 transformer for DAC, On transfomer not have 6 out put!

Do you mean I have to buy two 100W R-Core for the Dac End 2? How many outputs does each R-Core have? How could I tell from the page?

 

[quanghao]

Would the R-Core Transformer in the link work for Dac End 2? The Salas shunt has six AC saying 9-12V. Does the 100W R-Core have six inputs? How to tell?

Thanks!

You can fin it:
DIYCLUB
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)

R26-93 primary 115 X 2 : 0-9 (1A) X 2; 0-9 (2A)

DIYCLUB

R26-28 primary 115 X 2 : 0-12(0.85A) X 2; 0-9(0.85A) X 2
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)

 

[parodielin]

You can fin it:
DIYCLUB
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)

R26-93 primary 115 X 2 : 0-9 (1A) X 2; 0-9 (2A)

DIYCLUB

R26-28 primary 115 X 2 : 0-12(0.85A) X 2; 0-9(0.85A) X 2
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)

do I need to specify these numbers when ordering? both are 40W R-Core.

 

[quanghao]

do I need to specify these numbers when ordering? both are 40W R-Core.

You need get 2 transfomer
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)

For DAC board

 

[klaju1955]

do I need to specify these numbers when ordering? both are 40W R-Core.

why you don´t buy the one from Bud (BudP)of O-netics, he makes a trafo 6x9v in high quality, the price is between 72 and 90 dollar, look at the other Dac-thread, he makes an offer there, what you spent in trafo price you save in shipping costs, and this trafo is realy another quality.

Klaus

 

[Yomanze]

Hi,

Regarding the below post with the 'dac-ash' is anyone else going/gone with higher ESR caps at the chips?

Super low ESR caps are going to significantly worsen its transient step response by shortening its gain with frequency and by twisting the closed loop phase hard. Now I can't tell whether the digital chips get it worse with higher ESR because I haven't delved in to this DAC, but in this version the decoupling between chips in very high frequencies should not particularly suffer since there is a battery of dedicated regs (if the grounding and stray inductances help too). Thus I would lean into picking ESR to suit better the regs. At least plain vanilla caps are everywhere and cheap.

http://www.diyaudio.com/forums/quan...-dac-end-andrea-ciuffoli-186.html#post2247883

Was reading this:

If the 47μF capacitor used was actually a
subminiature aluminum electrolytic, the ESR might have been
in the 2 to 5 ohm range. This would have “flattened” off the
capacitor’s impedance before crossing the output impedance
curve and the severe impedance peak would not have
occurred.
http://www.calex.com/pdf/3power_impedance.pdf

If you can't handle the idea of using standard caps, then giving something like bc 128 (4.2ohm ESR) or some higher ESR tantalums is worth experimenting with. I do have some 270uf oscon SP for the preceding caps C3, C7 etc, but going with bc 128 to start with for IC coupling.

VISHAY BC COMPONENTS|MAL212854479E3|CAPACITOR, 47UF, 10V | Farnell United Kingdom

 

[parodielin]

why you don´t buy the one from Bud (BudP)of O-netics, he makes a trafo 6x9v in high quality, the price is between 72 and 90 dollar, look at the other Dac-thread, he makes an offer there, what you spent in trafo price you save in shipping costs, and this trafo is realy another quality.

Klaus

Could you provide a link to Bud's page?

Is this his page: C3Amps - O'Netics Transformers & Soldano Chassis - Onetics

 

[phrarod]

O-netics doesn't have a retail page. Here's their info

Or you can PM him but he's pretty busy so a phone call might be best.

 

[parodielin]

O-netics doesn't have a retail page. Here's their info

Or you can PM him but he's pretty busy so a phone call might be best.

OK, a phone call. What kind of transformer should I order? Does Bud make special transformer with six output for Dac End?

Thx!