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Old 17th August 2010, 12:48 PM   #121
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Default 12v or 15v?

I had to increase to voltage across R1 and R2 to .3vdc in order to get a healthy 12volts when I loaded with the Lagato.
Just curious, will current demands go down or up if I increase voltage toward 15v. I have plenty of ventilation and the PS is in a different box than the Buff/Lagato.
After almost 100 hours it is really sounding very good. I am using the OPA2227 in the buffer.
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Old 17th August 2010, 12:56 PM   #122
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Yes, the current demanded will go up with the voltage.

I am glad you are enjoying it!

Cheers!
Russ
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Old 17th August 2010, 12:59 PM   #123
needsp is offline needsp  United Kingdom
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Hi Pelliot

When I went from 12 to 15V, the total current (for just the I/V stages- no buffers, no Bal/SE stage) increased from 180mA to 200mA

Paul
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Old 17th August 2010, 01:20 PM   #124
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Just one more question concerning Legato's construction options. If I wish to filter GND, do I place C1-C4 over the purple and green pads?

Thanks!
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Old 17th August 2010, 05:07 PM   #125
needsp is offline needsp  United Kingdom
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Hi chipzahoy

Al you need to do is look at the tracks on the underside of the board, and trace them back to the supply inputs. Then you'll be certain!

Paul
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Old 18th August 2010, 04:50 AM   #126
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Haha, I would, except my Legato probably won't arrive until September (still waiting for my BufII pre-order). I guess I'm just being a little too enthusiastic
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Old 18th August 2010, 05:28 AM   #127
igwt is offline igwt  United States
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Hello Russ,
Is the current listed in the Legato manual 360ma total or 360ma per rail?+/-

Thanks-
igwt
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Old 18th August 2010, 07:17 AM   #128
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igwt,

Both!
360mA per rail is 360mA through the whole thing.
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Old 18th August 2010, 08:08 AM   #129
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Quote:
Originally Posted by AussieAmpBloke View Post
igwt,

Both!
360mA per rail is 360mA through the whole thing.
Quote:
Originally Posted by needsp View Post
Hi Pelliot

When I went from 12 to 15V, the total current (for just the I/V stages- no buffers, no Bal/SE stage) increased from 180mA to 200mA

Paul
The current without buffers, and Bal/SE stage is ok around 200mA?
Current without Bal/SE stage ?

From the manual!
"Adjust VR1 and VR2 on the Legato until each of the inputs sit as close to AVCC/2 as possible.
Don't sweat over this very much. Testing has shown that anything close is just fine."

This last adjustment should be made with or without the buffalo dac?
Thanks

Last edited by prooptiki; 18th August 2010 at 08:13 AM.
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Old 18th August 2010, 11:10 AM   #130
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Quote:
Originally Posted by prooptiki View Post
The current without buffers, and Bal/SE stage is ok around 200mA?
What do you mean by "is ok"?
Is it normal for it to draw that much current? Yes.

Quote:
Current without Bal/SE stage ?
You mean with buffer, but no BAL/SE? Then you'd be looking at about 280mA at +/-12V or about 340mA at +/-15V.
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