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Old 5th February 2010, 03:34 PM   #531
Ekkeri is offline Ekkeri  Finland
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Quote:
Originally Posted by audiodesign View Post
My choise about power supply transformers has been:

LS70-1 0-15X2(0.8A) 0-12X1(0.8A)
R80-55 0-9 X2 (3A),0-250(200mA)

I will test soon.
Have you tested these? Is that 15VAC still ok?

Quote:
Originally Posted by audiodesign View Post
To get the best performance by this DAC project it is necessary use on DAC output module a 200ohm MK132 Caddock resistor.
How accurate that 200R is? Partsconnexion has only 220R.. Any other good sources for those?
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Old 5th February 2010, 04:04 PM   #532
tassosk is offline tassosk  Greece
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Quote:
Originally Posted by Ekkeri View Post
How accurate that 200R is? Partsconnexion has only 220R.. Any other good sources for those?
RS components
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Old 5th February 2010, 04:09 PM   #533
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I have these r-core on my table but I am still waitng the pcb to test the these transformers.

The 90% of sound depend by the 200 ohm resistor but are valid also value of 190 - 220 ohm.

If you cannot find the Caddock please use 2 x 390ohm 1% in parallel.

----

I have updated the schematics and the photos on the webpage

DAC End 2 - the AD1865N-K with single ended vacuum output stage
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Old 5th February 2010, 05:24 PM   #534
Ekkeri is offline Ekkeri  Finland
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Quote:
Originally Posted by tassosk View Post
RS components
Thanks! I tried to search 'Caddock' earlier, but MK132 was The Word.
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Old 5th February 2010, 06:39 PM   #535
toufu is offline toufu  United States
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Quote:
Originally Posted by quanghao View Post
That is Ok!
you can use 100- 220uf max!
I just bought some 270uf on ebay, is that OK?
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Old 5th February 2010, 09:52 PM   #536
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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?

Last edited by agithegreat; 5th February 2010 at 10:12 PM.
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Old 5th February 2010, 10:04 PM   #537
adamus is offline adamus  United Kingdom
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I am going with some Z-foil resistors for the IV. Expensive but hopefully worth it.

I'll report back as i am going to try the, against generic metal film.
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Old 5th February 2010, 10:11 PM   #538
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Quote:
Originally Posted by adamus View Post
post 524 the salas reg is lit up on the right, yet from the pic no wire from transformer. Have you routed power from another salas reg under the boards?
No! You can see in my Tranformer:
Out put:
1. AC=12 V conect to -5V
2.Ac= 12V conect to 2 x +5 v!

Two AC inputs of +5 v I shared a coil, and I must be under the welding
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update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 5th February 2010, 10:26 PM   #539
adamus is offline adamus  United Kingdom
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Thanks, thats what i meant by 'shared power'.

your english is WAY better than any of my other languages so thanks for trying with all our questions - much appreciated.
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Old 5th February 2010, 10:32 PM   #540
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About the Transformer for DAC-End, please se in the image!
Attached Images
File Type: jpg Transformer-to-DAC-END.jpg (62.0 KB, 305 views)
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