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Old 17th November 2012, 11:23 AM   #1901
Salas is online now Salas  Greece
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Maybe something with the symmetry of the transformer or the reservoirs at power off tilting the burden to one force side. But it does not seem in error when working. When in no load are the force and sense properly tied to each respective one?
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Old 17th November 2012, 12:35 PM   #1902
jimchan is offline jimchan  Norway
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Agree, seems a bit mysterious. I will double check with a dummy load on each one and post the results.
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Old 17th November 2012, 02:18 PM   #1903
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Default Yeah...

You will probably want to remove the 100uF caps at the OPAs' input and replace them with something much smaller. I had 3 100uF caps at the input of the active devices (discrete transistors in this case) on my DAC's output stage, and replaced them with .1uF films when going to the Salas regulators. This change both kept the regulators stable, and made for a nice sonic improvement (more transparency, coupled with realistic timbre). I found when going to the Salas regs, it is an adittional advantage that big electrolytics can be eliminated in close proximity to the signal path.
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Old 18th November 2012, 06:26 PM   #1904
pchw is offline pchw  United States
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Quote:
Originally Posted by pchw View Post
It is up and stable upon first switch, no BOO
Next is to parallel a couple resistor to R101 and R103 to hit my 250mA and 5V mark then hook up to the dac ....
Salas, I owe you a couple pictures of the final product.
The black board is JP/Subbu's ES9023P Dac.

SSLV1.1 sounds better than any PS that I tried, so it is sitting on the top
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Old 18th November 2012, 06:52 PM   #1905
Salas is online now Salas  Greece
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Awesome, so classic diy. Enjoy!
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Old 19th November 2012, 07:47 PM   #1906
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pchw

great build
do you find difference when substitute original psu to Salas
what brand and where to find yellow films
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Old 19th November 2012, 09:49 PM   #1907
pchw is offline pchw  United States
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Samoloko,

I haven't receive the PS board from Subbu yet, so there is no original psu per se.
I built a few 3-legs regular based psu from:

regulator booster - pink fish media
and the using 3-pin regulars concept from Just one thing about music - when it hits you feel no pain

The results were quite good but not as good as SSLV 1.1, obviously. My ears are nothing to be pride of. It wasn't a night and day after I swapped in the SSLV, but in a more in depth audition, the improved clarify throughout the audio range just made the listening experience that much enjoyable.

The yellow caps are some unknown brand that I have owned for quite some time. They were new, but the voltage rating is too low for my tube projects. Since the build guide suggests 4.7uF to 10uF film caps, they fit the bill :-)

In short, it is well worth the effort to build and try!!
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Old 21st November 2012, 09:34 AM   #1908
Magsy is offline Magsy  United Kingdom
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I've read all 191 pages during a 'busy' day at work but I still have questions sadly.. :P

Can someone please confirm 36v AC is enough for a solid 45v DC out?

I know 36 x 1.41 -0.7 = 50v but of course that will go up and down a bit and will depend on my diodes.

Ideally I'd like to use some 40v AC transformers that are easily available but that will be too much for Q102?

40 x 1.41 - 0.7 = 55.7v

Earlier in the thread Salas mentions you need to take into account the LED drop at D102/103/104 which would put this in the correct range just about but risky? I'm willing to live on the edge but this is too much?

Thanks
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Old 21st November 2012, 10:52 AM   #1909
Salas is online now Salas  Greece
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I would rather use 1.32 to 1.35 multiplier for full bridge and 50VA transformer for AC to DC expectations. You don't want it to go over 55V when your mains value is topping. And you don't want it to go less than 50V when it is low. Do you have a rough picture for mains variations at your residency?
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Old 21st November 2012, 10:56 AM   #1910
Salas is online now Salas  Greece
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P.S. A series resistor between Tx and bridge, smallish value for circa 2V drop in resultant DC, can help if the system will tend highish, with the added benefit of some filtration. 2W resistor.
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