DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 117 - diyAudio
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Old 31st January 2012, 04:25 PM   #1161
50AE is offline 50AE  Bulgaria
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What about this "finesse" clean up shunt? Finesse Voltage Regulator Noise! What do you think about it? I like simplistic designs, so I paid attention to it.
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Old 31st January 2012, 04:39 PM   #1162
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Im almost done with my enclosure.
Click the image to open in full size.

Click the image to open in full size.
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Old 31st January 2012, 04:44 PM   #1163
ptempel is offline ptempel  United States
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Quote:
Originally Posted by 50AE View Post
What about this "finesse" clean up shunt? Finesse Voltage Regulator Noise! What do you think about it? I like simplistic designs, so I paid attention to it.
It looks good, but I have no experience with shunt regulators yet. Was thinking of doing a Salas or ALSW super reg at some point. This circuit is simpler so may be worth a shot. Are you bypassing or using the onboard regulation on your DAC? Speaking of which, looks like apoopoo999 above is bypassing his. Looks good!

Last edited by ptempel; 31st January 2012 at 04:47 PM.
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Old 31st January 2012, 05:21 PM   #1164
50AE is offline 50AE  Bulgaria
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I can bypass them if I want. I like apoopoo's work, the problem is that I planned my case for tube pream stage, tube rectifiers, big electrolyteless caps, chokes and... there won't be much space for so huge regulators.

A good thing is that much stuff will be on top, as it is with most tube amps. At least tubes, caps and power trannies will be. Caps are russian MGBO steel casings, they will have their ugly steel casings removed and be put into wood ones poured with parrafin wax inside. It does improve the sound and it's much more eye friendly

Last edited by 50AE; 31st January 2012 at 05:23 PM.
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Old 31st January 2012, 05:32 PM   #1165
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Quote:
Originally Posted by ptempel View Post
Speaking of which, looks like apoopoo999 above is bypassing his. Looks good!
Yes Im using salas shunt

(2) 5v for digital and analog
(2) 3.3v for digital and analog
(1) 15v + for opamp
(1) 15v - for opamp

I have to admit now that this dac sounds amazing.
Kicks cs4398 butt
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Old 31st January 2012, 05:42 PM   #1166
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Quote:
Originally Posted by 50AE View Post
I can bypass them if I want. I like apoopoo's work, the problem is that I planned my case for tube pream stage, tube rectifiers, big electrolyteless caps, chokes and... there won't be much space for so huge regulators.
thanks, take a look at the power supply section of the Dac End AD1865 pcb. He managed to fit 6 salas shunt into a very small board. Someone should start a group buy for a pcb like this, its perfect for this DAC
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Old 31st January 2012, 05:42 PM   #1167
50AE is offline 50AE  Bulgaria
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apoopoo, do you mind sharing the circuit or its version (AFAIK salas shunt has few variations) and the value of the components for 3,3V and 5V output? Thanks!

Nice big casing though. Are you planning for lampization or a discrete output or sticking with opamps?
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Old 31st January 2012, 06:59 PM   #1168
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Quote:
Originally Posted by 50AE View Post
apoopoo, do you mind sharing the circuit or its version (AFAIK salas shunt has few variations) and the value of the components for 3,3V and 5V output? Thanks!

Nice big casing though. Are you planning for lampization or a discrete output or sticking with opamps?
I used this as a reference for the 5v and 15v
I have the 3.3v at home. I will upload that later.

It sounds very good to me the way it is so I am going to leave the opamp output.
Attached Images
File Type: jpg 3.3Vregulatormodules.jpg (148.1 KB, 700 views)
File Type: jpg 5Vregulatormodules.jpg (152.3 KB, 662 views)
File Type: jpg 15vregulatormodules.jpg (178.7 KB, 654 views)

Last edited by apoopoo999; 31st January 2012 at 07:19 PM.
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Old 31st January 2012, 07:52 PM   #1169
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oops I found a mistake in the previous file. I attached corrected files
Attached Images
File Type: jpg 3.3Vregulatormodules.jpg (148.1 KB, 245 views)
File Type: jpg 5Vregulatormodules.jpg (147.0 KB, 150 views)
File Type: jpg 15vregulatormodules.jpg (180.9 KB, 160 views)
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Old 31st January 2012, 07:55 PM   #1170
NebuK is offline NebuK  Germany
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Quote:
Originally Posted by fulvio View Post
NebuK, I think the temperatures you measured are correct.
Consider the 1117-5: the dropout is 12-5 = 7 V, the current drawn from the AK4396 is 32 mA (from AK datasheet, typ. value), so the power dissipated in the 1117 is 224 mW.

The thermal resistance of the 1117 (junction to ambient) is 136C/W, so the junction temperature will be 30.5C over the ambient; assuming ambient is 22C, the junction temperature will be 52.5C.
The junction to case thermal resistance of the 1117 is 15C/W, so the 1117 case will be 3.6C less than the junction, that is about 49C, very near to the one you measured (50C)

You dont have to be worried about these temperatures, they are quite normal.
Thanks for the mathematical clearification!
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