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Old 22nd October 2019, 08:11 AM   #261
tvicol is offline tvicol  Europe
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Ron,

If you make use of two synchronous rectifier, you need a transformer with two separate secondaries. Does not matter if these are in phase or not, as each rectifier will operate independently.

At +/-60V another solution is to use a single synchronous rectifier as is Saligny HV. For this you need a transformer with two separate secondaries and connect these in phase.

I'll prepare some schematics that make things clear.

Regards,
Tibi
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Old 22nd October 2019, 08:20 AM   #262
tvicol is offline tvicol  Europe
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Quote:
Originally Posted by analog_sa View Post
... No factory made centre tapped transformer will work. ...
This is no true. There are center taped transformers that work just fine.

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Tibi
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Old 22nd October 2019, 08:41 AM   #263
jean-paul is offline jean-paul  Netherlands
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Quote:
Originally Posted by analog_sa View Post
It is exactly the opposite. You can have a centre tap working with a single 4320 only if you construct the centre tap yourself out of two separate secondaries. No factory made centre tapped transformer will work.

This should be mentioned at the first post of this thread.
Yes! I see it is hard to catch matters in words without a drawing/schematic. I made a schematic after the comment of tvicol and had to laugh when I reread my own post.

Let us agree to use schematics instead of only words
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Old 23rd October 2019, 07:04 AM   #264
Rinman77 is offline Rinman77
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Quote:
Originally Posted by tvicol View Post
Ron,

If you make use of two synchronous rectifier, you need a transformer with two separate secondaries. Does not matter if these are in phase or not, as each rectifier will operate independently.

At +/-60V another solution is to use a single synchronous rectifier as is Saligny HV. For this you need a transformer with two separate secondaries and connect these in phase.

I'll prepare some schematics that make things clear.

Regards,
Tibi

Thank you, your help is much appreciated.
The Saligny HV certainly seems an easier solution, but I have in my hand already the means to try the dual-chip solution, so it is very tempting not to wait.
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Old 23rd October 2019, 09:32 PM   #265
Luca72c is offline Luca72c
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Hey, wait a moment... If i understand well the last few pages of this thread, there is no way of using saligny with a NORMAL center tapped transformer (i say normal as 99,99% of all ct transformer secondaries have windings in anti-phase - i left 0,01% just because you never know...)? I mean no way using a single HV saligny nor using 2 separate salignys?
This is HUGE limitation, as a large part of HV transformers for audio are center tapped! I agree with analog_sa that this should be stated very well to anyone interested in purchasing a saligny rectifier, in red capitals in the first page...

Last edited by Luca72c; 23rd October 2019 at 09:41 PM.
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Old 24th October 2019, 07:41 AM   #266
tvicol is offline tvicol  Europe
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Luca72c,

I do not see this as a limitation and I also I do not see your 99.99% CT anti-phase transformers. ;-)
Even anti-phase CT transformers can be easy phase corrected as the CT is in 99,99% cases made from two wires. In fact is a loop. Any diy-er with minimum skills may cut that loop and correct the phase.
This is a case that I learned together with diyaudio community. I offered a solution, there may be other solution/s that I'm not aware off. The issue is not mentioned on any LT/AD datasheet and I must admit that I had to turn on my scope several times till I figured out what is wrong.

This GB was closed months ago and is nothing to sell here. However your point is relevant and was added to first page.

Regards,
Tibi
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Last edited by tvicol; 24th October 2019 at 07:46 AM.
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Old 24th October 2019, 07:02 PM   #267
Luca72c is offline Luca72c
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Originally Posted by tvicol View Post
Luca72c,
I do not see this as a limitation and I also I do not see your 99.99% CT anti-phase transformers. ;-)
Even anti-phase CT transformers can be easy phase corrected as the CT is in 99,99% cases made from two wires. In fact is a loop. Any diy-er with minimum skills may cut that loop and correct the phase.
This is a case that I learned together with diyaudio community. I offered a solution, there may be other solution/s that I'm not aware off. The issue is not mentioned on any LT/AD datasheet and I must admit that I had to turn on my scope several times till I figured out what is wrong.
This GB was closed months ago and is nothing to sell here. However your point is relevant and was added to first page.
Regards,
Tibi

Hello Tibi,

i don't want to argue, but believe me: in many years of interest for hifi gears and diy, i have seen dozens of ct transformers, many of them i used and others were used by friends of mine and i'm sure 100% of them had secondary windings in anti-phase and center tap made by a single wire. 100% of them. At lest here in Italy, i don't know if elsewhere it's the same, but i think so, as many of these transformers i saw were made in USA, Deutschland, Japan, etc...
So thank you for quickly providing a solution for this problem, i really appreciate your work, but my 2 ct transformers have secondary windings in anti-phase and single-wire center tap (maybe the loop you say is enclosed in the transformer's pack? I don't know, but i can't reach it...), so i cannot apply your solution and i think many other users cannot as well, unless they use to build/wind/unwind transformers by themselves, that i wouldn't call a "minimum diy skill". Surely i could buy another 2 transformers with dual identical secondaries and wire the center tap as you say, but i spent hundreds of euros for my current 500VA, low electromagnetic flux, ct transformers and i would like to use them and avoid spending other hundreds of euros.

Now, is it possible to find another solution that can work with normal, anti-phase secondaries, single-wire center tap transformers? That would allow many more diyers like me to use saligny.
Thanks

Last edited by Luca72c; 24th October 2019 at 07:05 PM.
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Old 24th October 2019, 07:04 PM   #268
jean-paul is offline jean-paul  Netherlands
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This has already been answered by tvicol. Only buying other transformers will work. It is not a limitation of Saligny but of LT4320.
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Old 26th October 2019, 09:57 AM   #269
nautibuoy is online now nautibuoy  United Kingdom
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Any information on how I can buy Saligny HV?
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Old 28th October 2019, 08:30 AM   #270
tvicol is offline tvicol  Europe
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Quote:
Originally Posted by nautibuoy View Post
Any information on how I can buy Saligny HV?
Please check our website or subscribe to our twitter to get info when we will start to sell.


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