Salas hotrodded blue DCB1 build - Page 293 - diyAudio
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Old 14th March 2013, 08:38 AM   #2921
stajo is offline stajo  Sweden
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Quote:
Originally Posted by dtses View Post
Anyway, I'm a bit disappointed
It was not my meaning to crush your intentions. Here is a picture I found on Wikipedia showing the magnetic flux field around a toroidial transformer.
Click the image to open in full size.

30 VA might work for a non hot rodded, depending on how the manufacturer counts on specs. (30 VA / (15+15)*1,4 is about 714 mA) As Salas says, dont give up, plug the current trafos in to your equipment and hold them in different ways to see if you can hear any EMI interference. It looks like on the pic that the trafos are mounted on some peice of metal. Maybe you can put that 90 degrees.
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Old 14th March 2013, 10:16 AM   #2922
AndrewT is offline AndrewT  Scotland
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the 30VA potted transformers may be C core.
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Old 15th March 2013, 08:14 AM   #2923
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cheers!

I'll finish the project anyway, I was just a bit disappointed that it would take more time than I expected. Plus I assume that the chassis needs to be swapped to some decent one, not sure if I get any positive results with this one as there is no place even for a 50VA trafo that is usually 78+ mm.

Anyway, I'll make few more tests and report the results here on the following week.
thanks again!
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Old 15th March 2013, 06:07 PM   #2924
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Well after "hotrodding" a bit and changing the 0.22 uf wimas for 0.33uf mundorf supreme silver in oil I did not notice any difference in sound.. Not better, not worse.
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Old 15th March 2013, 09:03 PM   #2925
Rixsta is offline Rixsta  United Kingdom
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Hi, if i build a DCB1 whats the chances of there being too much DC at the input, if i was using say a PC soundcard, a Tape Deck, or CD player ?
would putting one DC blocking cap on the input of each channel, defeat the purpose of having a DCB1 ?

I see a couple of DCB1's mentioned on Diyaudio, whats the main difference between them ?

Thanks
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Old 15th March 2013, 10:02 PM   #2926
Salas is offline Salas  Greece
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Quote:
Originally Posted by bambadoo View Post
Well after "hotrodding" a bit and changing the 0.22 uf wimas for 0.33uf mundorf supreme silver in oil I did not notice any difference in sound.. Not better, not worse.
What is the rest of the system?
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Old 15th March 2013, 10:04 PM   #2927
Salas is offline Salas  Greece
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Quote:
Originally Posted by Rixsta View Post
Hi, if i build a DCB1 whats the chances of there being too much DC at the input, if i was using say a PC soundcard, a Tape Deck, or CD player ?
would putting one DC blocking cap on the input of each channel, defeat the purpose of having a DCB1 ?

I see a couple of DCB1's mentioned on Diyaudio, whats the main difference between them ?

Thanks
Better put one cap on the output. You still got one coupling instead of two and shunt regulators. It partly defeats the purpose but not entirely in other words. If your amp has an input cap already you need no more. Chances with sources are they will not be usually having high DC offset but you should see that with your DMM in DC mode checking one by one their output.
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Old 15th March 2013, 11:33 PM   #2928
Rixsta is offline Rixsta  United Kingdom
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Thx its all starting to make sense now !
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Old 16th March 2013, 09:01 AM   #2929
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Hi, diy almost all over the place.
Super tweaked Audio Note kit1 (double c cores etc) - well it is a bit retired now
Harrissons symef in my setup right now.
DCb1 and Super tweaked Audio Note linestage (double c core OPT's etc) - well trying a 12b4a circuit in it right now. Switching between these.
DIY "onken" Hemp Acoustics co15v speakers.. Some of the best I have ever heard and built.
DAC: Highly modified Audio Note..

An old picture.
Click the image to open in full size.


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What is the rest of the system?
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Old 16th March 2013, 09:14 AM   #2930
stajo is offline stajo  Sweden
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Do I see a pair of QIIs there?
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