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Old 30th November 2012, 05:06 AM   #2001
qusp is offline qusp  Australia
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yeah that was a bit harsh, Rush, hochopeper thought better of it too but youve quoted him already =) like I said to him, its not war, too often its easy to forget that.

I'm just saying you really need to think about the demands of the circuit locally and if theres a heap of smoothing before the regulation and then a high performance regulator; the TX impedance isnt the dominant impedance and if its not even local even moreso.

just one set of connectors and a single resistor renders the lowest impedance transformer redundant, provided the highest impedance transformer we are considering can deal with the power demands, which in a preamp are usually pretty low.

in a poweramp with very high current demands and minimal or no regulation; it becomes more important, but its still the caps that supply the current until they need filling again.

anyway i'm happy you are getting good results and you should continue to do what makes you happy, I made a single comment that turned into more than it should have. I like to have more power than needed too, but not that much and not so much in low noise circuits where it can be counterproductive.

Last edited by qusp; 30th November 2012 at 05:13 AM.
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Old 30th November 2012, 05:51 AM   #2002
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Default And...

Since this is the Salas Shunt regulator thread we are talking about here: with a hefty current margin in the CCS, and powering a low current draw circuit (line level), grossly oversize transformers will not be a good thing. The CCS current and output impedence of the reg is what is going to matter, even the dynamic demands on the smoothing cap(s) is going to be low/nil with a generous margin in the CCS.
Now oversizing a transformer in a different design may have totally different consequences... with the Salas regs, ~2x current margin in the transformer has proven to be entirley adequate for me, and going bigger has not offered any sonic benefits to my ears. When I do hear benefits is when I make sure there is plenty of margin current in the CCS.
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Old 30th November 2012, 07:19 AM   #2003
qusp is offline qusp  Australia
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yeah I did say regulator and caps, unless the reg is right next door and you have removed all decoupling caps (sometimes the best thing to do IF the reg is local enough), the decoupling caps and potentially planar PCB capacitance will still be the first thing delivering any current for a transient. depends on the transient

Last edited by qusp; 30th November 2012 at 07:21 AM.
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Old 30th November 2012, 08:44 AM   #2004
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by hochopeper View Post

For a line stage circuit with a shunt regulator, there is very little point to an oversized transformer. It is not the part of the circuit that supplies the current to a transient load.
Indeed but I found that using a double sized TX can make a BIG difference even behind a shunt reg.

Quality of the smoothing caps are also audible through the shunts

I do not know if there is a limit for tat but using one 50VA tx for the simplistic is totally different from using a 80VA or even a 120VA

My best builds use two 120VA tx in double mono config.
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Old 30th November 2012, 09:12 AM   #2005
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What'll make you raise your eyebrows a bit is if you change a 50VA "china" Torroid for an "old stock" 50va one, or even more noticeable is the difference of a 50va EI - (haven't tried an R-core yet)

The differences aren't major, but quite clear and if you combine variations of diodes and filters caps, the sum of these things adds up to a quite noticeable overall change, and this is before the Shunt Reg!

There are few of us that are interested in using snubbers (R-C networks) after the diode bridges and the ready availability of fast, soft Shottky diodes makes it a minor detail these days but the old idea of "tuning the transformer windings" has been all but forgotten but it's remarkable to find that this has quite dramatic effects on the overall sound after the Shunt reg - (and a real PIA to do!)

Fascinating things, power supplies!
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Old 30th November 2012, 11:47 AM   #2006
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I think before I build. I also think before I write. People these days will find any excuse to avoid thinking, it seems.
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Old 30th November 2012, 11:48 AM   #2007
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Indeed but I found that using a double sized TX can make a BIG difference even behind a shunt reg.

Quality of the smoothing caps are also audible through the shunts

I do not know if there is a limit for tat but using one 50VA tx for the simplistic is totally different from using a 80VA or even a 120VA

My best builds use two 120VA tx in double mono config.
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Old 30th November 2012, 01:26 PM   #2008
Tea-Bag is offline Tea-Bag  United States
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Guys, lets keep potentially offensive opinions out of the mix.

People who post here come from many different backgrounds. Some need a lot of help, some don't. I try to be someone who always helps (even though it's not usually technical). A lot of people private message because they are afraid of being brow beaten on the list. People have a hard time getting a lot of concepts. We learn by analogies, not often well done in one comment. We learn by making some mistakes, and best to be caught on the list doing so then releasing the white smoke.
I hope that you come hear to either make good audio, or help others get there - either by good assistance or opinion.
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Old 30th November 2012, 02:35 PM   #2009
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Quote:
Originally Posted by RCruz View Post
Indeed but I found that using a double sized TX can make a BIG difference even behind a shunt reg.

Quality of the smoothing caps are also audible through the shunts

I do not know if there is a limit for tat but using one 50VA tx for the simplistic is totally different from using a 80VA or even a 120VA

My best builds use two 120VA tx in double mono config.
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Old 30th November 2012, 02:53 PM   #2010
sonidos is offline sonidos  United States
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Tea, that's great! I found some of these boards next to the DCB1. Although I can navigate the complex stuff, some of the simple stuff trips me up! Go figure.

I'm building the Marsh headphone amp and Richard Marsh said a shunt reg circuit should work great with his head amp. But each channel is powered separately by V+/V- rails and I'm not sure how to wire up a V+/V- SSLV1.1 to two separate boards for the head amp. I'm not there yet but when I'm ready, it will be great to know exactly how it should all be set up
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