DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 225 - diyAudio
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Old 11th November 2012, 07:35 PM   #2241
bcmbob is offline bcmbob  United States
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I can answer two of your questions. 15 V works just fine. My R-core is connected straight to the DAC with nothing in between. Have not built the shunt yet and the audio is top quality in my book.

No need to apologize for asking questions. That's why the forum Is here and it's the way we all learn
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Last edited by bcmbob; 11th November 2012 at 07:41 PM.
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Old 11th November 2012, 09:02 PM   #2242
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Originally Posted by bcmbob View Post
I can answer two of your questions. 15 V works just fine. My R-core is connected straight to the DAC with nothing in between. Have not built the shunt yet and the audio is top quality in my book.

No need to apologize for asking questions. That's why the forum Is here and it's the way we all learn
thanks so much BOB. 'music to my ears!!'
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Old 12th November 2012, 02:01 AM   #2243
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Originally Posted by reg66 View Post
this thread is just MASSIVE!!! ....

4. are there any images of a finished salas and where the 5V connection point is on the DAC....

thanks again people

Yes, several ... I'm sure I'll miss some posts, but for example, take a look at:

df_genius's post at 667, p. 67 (not sure if is Salas shunt);
apoopoo999's post at 862 p.87 (Salas);
Giobax's post at 1347, p. 135.

I haven't been watching for posts on the Salas shunt regulator, but it seems like circuit boards for building them are available on this site from time to time. Maybe on Power Supply or Group Buy forums.
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Old 12th November 2012, 02:05 AM   #2244
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3. there's a lot of talk about the salas shunt 5V for analogue. is it absolutely necessary?
Absolutely not.

The DAC sounds great with the OnSemi regulators I'm recommending.

A better PS could improve performance further, though.

When I've tried my simply shunt I've improved performance but not so much to give me motivation to go further, possibly Salas one could give a broader difference..
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Old 12th November 2012, 11:28 AM   #2245
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Dario,
many thanks for the straightforward answers. I use Philips LL high voltage caps in the PS of a KT88 amp and both my Badas.The Rifa PEH series were very good caps as well but discontinued. Point taken re. the Oscons.

Taking care with PS always is a good idea - as I know very well the sound of my Bada h/amp I might try some appropriate Kendials there first (470uF/400/385V) before splashing out on some high value ones. Very often top quality industrial components are way cheaper with longer usable life than the boutique/uber expensive ones.

Will I consider a valve o/put - I don't know as the o/put of this DAC will go to a Tung Sol 6F8G R/P driver feeding 2 x 1578 Russian o/put pre-amp section - I don't like using lots of different valves all adding there own flavour aka a horrible melange sound - others might well disagree - it's all a question of personal taste.

Vamos a ver/ let's see.
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Old 12th November 2012, 11:32 AM   #2246
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THANKS SO MUCH GUYS!

really impressed by the helpfulness of people here.
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Old 12th November 2012, 01:02 PM   #2247
qusp is offline qusp  Australia
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this thing about the oscons, makes no sense whatsoever. the point of decoupling caps (both bulk and local) for opamps is to supply current as quickly as possible. i'd love to hear an explanation how the current is any more non-linear than silmics, since its a technical claim, some technical proof of that and a real effect on the output would be preferred. electrolytic caps are not linear, none of them, opamps themselves for that matter are not linear, but for decoupling, its really of no consequence.

the most spectacular opamp based amplifier i've ever seen measured extensively with all sorts of analyzers is the SE-SE 'the wire' headphone amp, its measures are essentially perfect and bouncing up against the limits of the instrumentation, I dare say far better in every way than this circuit with some silmic caps. guess what types of caps it uses?

silmics are good caps, I use them myself sometimes, particularly if I have to have a cap directly in the signal path and it has to be too big for a film cap to be used, but for decoupling an opamp supply I will take polymer with small ceramics directly on the pins every time

Last edited by qusp; 12th November 2012 at 01:14 PM.
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Old 12th November 2012, 01:06 PM   #2248
50AE is offline 50AE  Bulgaria
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Soon I will compare the sound of AKM4396 vs double WM8741 from weiliang. Both will be powered by Salas shunts and 12V SLA battery.

Both will be direct out
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Old 12th November 2012, 02:14 PM   #2249
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this thing about the oscons, makes no sense whatsoever.
(...) but for decoupling an opamp supply I will take polymer with small ceramics directly on the pins every time
There's a large literature of subjective tests reporting OSCONs as bad/strange sounding as analog decoupling caps...

For analog decoupling I will take audio rated caps and a rail to rail film/foil cap as near as possible to pins every time...

In my experience Polymer caps usally sound thinner, less balanced and harsher than audio grade caps.
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Old 12th November 2012, 06:29 PM   #2250
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i think there maybe a small typo on your BOM, Dario!

C6, C8, C9 and C21 all show the same part number, but C9 shows 63V. i take it it's meant to be 50V?

sorry for nit picking, just want to be sure!
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