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OLD THREAD DAC End by Andrea Ciuffoli

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quanghao

quanghao

Member
Joined 2009
quanghao.com/
agithegreat said:
Is it possible to use a single 12v output from a transformer (at say 2a) and use this to run the entire shunt board?

Or are we better off using individual windings for the AD1865 and a separate one for the CS8414?

Also how critical is the 250v requirement onto the valves?
Could 220-250v be ok? Or is 250v an apsolute must?
Click to expand...

Hi! agithegreat!
you can see post 540 please!
 
A

adamus

Member
Joined 2008
Theoretically 3 seperate is better. and seeing as the dac is overkill throughout you should stick with tradition.

I had a quote of canterbury windings for a custom toroid @ £75 shipped.

I think you will do very well to beat that with seperate transformers in the uk.

I sent a few quote requests out today to places like airlink. I'll report back. I still think custom is the way to go on this.
 
A

Agi

Member
Joined 2008
adamus said:
Theoretically 3 seperate is better. and seeing as the dac is overkill throughout you should stick with tradition.

I had a quote of canterbury windings for a custom toroid @ £75 shipped.

I think you will do very well to beat that with seperate transformers in the uk.

I sent a few quote requests out today to places like airlink. I'll report back. I still think custom is the way to go on this.
Click to expand...

I'd agree, but the flag is a little confusing... I'm from the UK, but for the past 4 months i've been in the US, and i'm here another few months, so i'm getting it much cheaper than home :p.
 
E

Ekkeri

Member
Joined 2008
audiodesign said:
In the DAC End ver. 2 we must use 265-275V to get a low distortion because many voltage are lost on anode resistors and on the anode there are about 180v.
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audiodesign said:
In any case use a 220:9+9 100w for the filaments and to drive a 9+9:220 50w to get also the 220V ac of anodic voltage is ok
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quanghao said:
Yes 250V at least.
Click to expand...

I'm getting little confused in here.. Could you deside already? :D

220VAC would be a easy find, but >250VAC is a harder one.. And how about the current? Andrea said min. 200mA, but there are 100mA in quanghao pic and 50mA here.
 
apelizzo

apelizzo

Member
Joined 2006
Ekkeri said:
I'm getting little confused in here.. Could you deside already? :D

220VAC would be a easy find, but >250VAC is a harder one.. And how about the current? Andrea said min. 200mA, but there are 100mA in quanghao pic and 50mA here.
Click to expand...

===============================================

This 100VA Transformer can be suitable for the power stage (Tubes + Heater)

R80-36 primary (0-110) x 2 /SCN: scondary (260-230-0-230-260)(200mA), 2.5-0-2.5(3A), 3.15-0-3.15) X 2(3A)

Easy to get 8.15V for heater Series 2.5+2.5+(3.15parallel) :)


Available from diyclub.biz
DIYCLUB

For Salas use three little separate transformers possibly toroidal. EI can be noisy if you don't orientate them properly inside the case . Better than a single one with 3 x 9V. They can still jam inside the same transformer. Why on the board you got 3 separate AC inputs and not one? Because you want to avoid jamming signal. So in the same way go to the end! 3 separate transformers is more Hi-End. The AD1865 is the architect of the sound. If he's drunk how can he make good sound? It's up to you.
 
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quanghao

quanghao

Member
Joined 2009
quanghao.com/
For Salas use three little separate transformers. Better than single one with with 3 x 9V. They can still jam inside the same transformer. Why one the board you got 3 separate AC input and not one? To avoid jamming signal. So in the same way go to the end! 3 separate transformers is more Hi-End.[/QUOTE]

using three separate transformer is too good, but so is too expensive and unnecessary, because the shunt Salas help you do that ( the Salas shunt is exelent im sure), so just a transformer with three outputs is ok, and the best!
 
apelizzo

apelizzo

Member
Joined 2006
Transformers

quanghao said:
secondary 0-250V(50mA) X 2, it is Ok
0-7.5V(1A) X 2 it is not ok ( filament is min 3A)
you can fin other!
thank
Click to expand...

I think I will go for this:

For Anode and Heaters:
R80-36 primary (0-110) x 2 /SCN: scondary (260-230-0-230-260)(200mA), 2.5-0-2.5(3A), 3.15-0-3.15) X 2(3A)

For Salas Analog +5V -5V rails:
10VA PCB potted toroidal primary(0-120)x2 / SCN (0-9V 500mA) x2

For Salas Digital +5 rail:
10VA PCB potted toroidal primary(0-120)x2 / SCN (0-9V 500mA) x2

R-Core and Toroidal transformers are similar: low leakage, low chances of noise. No EI transformers here for me.
 

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quanghao

quanghao

Member
Joined 2009
quanghao.com/
EUVL said:
I just checked with Mark Lai today and he has not received yet from you his 4 boards and my complimentary full set as yet. Can you advise us when you sent them 29 Jan ?) and whether there is a tracking number ?


Thanks,
Patrick
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hi Patrick! I alway say that: about 3-4 weeds you will get it! some PCb arrive early!
It is that you! see in the image. Im sorry I post here!
 

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