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Old 31st May 2014, 11:19 PM   #11
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Quote:
Originally Posted by Salar View Post
According to this thread @ twistepearaudio, a Placid HD BP draws about 890mA. Adding some headroom, letīs say 1.5A.
In this scenario,the math says 22.5VA should be sufficient, correct?
All the best,
Sal
That's not at all what that thread is saying.

The Placid is not drawing that much; the boards he is powering is drawing that much. The Placid, by itself, will draw slightly more current than you set it to shunt.

You need to determine the load you are presenting to the Placid (what modules you are powering), plus the shunt overhead.

The size of your transformer is dictated by this, not the Placid itself.
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Old 1st June 2014, 09:16 AM   #12
Salar is offline Salar  Germany
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Hello Brin!
Thank you for the reply. I will power the Buffalo III DAC and IVY. So how much current (including reasonable shunt overhead) will they draw?
All the best, Salar
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Old 1st June 2014, 10:15 AM   #13
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My BIIIse with Tridents draws around 550mA (with Exa) Shunting appr.60mA
Ivy around 150mA ( 75mA from each half on Placid BP ). Shunting appr. 60mA

In my BIIIse's the I2C header feeds Exa usb-I2s device with 3v. If not using the I2C on BIIIse, I guess 490-500mA current is correct.

Last edited by smooth dancer; 1st June 2014 at 10:18 AM.
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Old 1st June 2014, 01:20 PM   #14
Salar is offline Salar  Germany
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Hello Smooth Dancer,
60mA shunting is for the new HD Placids?
Then absolute minimum transformer should probably be:
BIIIse = 610mA x 9V = 5.5 VA
IVY = 210mA x 15V = 3.1 VA

I guess even 10VA for the Buffalo IIIse and even 5VA for the Ivy should be
sufficient without stressing / heating the transformer?

Anyway, for my design I will choose the "old" transformer ratings of 15VA for the Buffalo and 30VA for the IVY.
This is almost three times available current for the BIIIse and almost ten times current for the IVY.
All the best,
Salar

Last edited by Salar; 1st June 2014 at 01:26 PM.
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Old 21st July 2014, 06:00 PM   #15
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I finally installed my new custom made 100VA trafo (placid 2.1, 13V) and the difference is...huge.
To be honest - i didn't expect this, but a friend of mine who professionaly work in this field told me that because my stock 30W trafo was getting warm\hot - it is a bad sign and it may be working out of it's optimal\linear range and only then i finally i decided to try replacing it...

To make description short - the improvements are largely in dynamics and bass with some additional cleanness as bonus. The buffalo was always nice and clean, but slightly anemic compared to my other dac. Now the dynamics is overhelming and it got what was missing - the "bite" and attack as well as firm bass.

So i guess one should not use Legato 3.1 with anything less than 50W

Last edited by AlexanderTD; 21st July 2014 at 06:08 PM.
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Old 21st July 2014, 06:55 PM   #16
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He he,,,I use 250va on each of my Ivy's. Becouse it works like a dream. Better bass and dynamics.
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Old 23rd July 2014, 06:53 PM   #17
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Quote:
Originally Posted by smooth dancer View Post
Better bass and dynamics.
How would this happen? I could understand maybe clipping with not enough power, but better sound with excess power? Can someone explain the science?
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