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Zen -> Cen -> Sen, evolution of a minimalistic IV Converter
Zen -> Cen -> Sen, evolution of a minimalistic IV Converter
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Old 6th November 2017, 05:00 PM   #2061
kumori is offline kumori  Europe
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Thank you for your detective work. I also had level reduction once and couldn‘t put my finger on it... good for a future reference
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Old 6th November 2017, 05:17 PM   #2062
EUVL is offline EUVL  Europe
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Debugging can be very frustrating.
Just glad that you found it in the end, without any major part replacement necessary for the IV itself.




And thank you for sharing,
Patrick
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Old 6th November 2017, 10:36 PM   #2063
jameshillj is offline jameshillj  Australia
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Hey Garrett,

I did find some of those red Black Gate Bipolars at 680uF, 35v - would these be worth trying in place of the Muse ES green ones (color coordinated, yes!)

Interestingly, I still haven't found a use for those 50R VPR220 resistor yet - one day ...
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Old 7th November 2017, 10:58 AM   #2064
EUVL is offline EUVL  Europe
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I have to admit that I do not understand a scientific explanation of better sounding caps in this particular circuit.
Unless we do not believe in Kirchoff's Law.

The signal current flow through a complete different circuit than the bias current.
So how can the cap has an effect ?
Except of course for the look, which I cannot argue against.


Cheers,
Patrick
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Old 7th November 2017, 10:40 PM   #2065
alazira is offline alazira  United States
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Quote:
Originally Posted by jameshillj View Post
Hey Garrett,

I did find some of those red Black Gate Bipolars at 680uF, 35v - would these be worth trying in place of the Muse ES green ones (color coordinated, yes!)

Interestingly, I still haven't found a use for those 50R VPR220 resistor yet - one day ...
I would give them a go.


Quote:
Originally Posted by EUVL View Post
I have to admit that I do not understand a scientific explanation of better sounding caps in this particular circuit.
Unless we do not believe in Kirchoff's Law.

The signal current flow through a complete different circuit than the bias current.
So how can the cap has an effect ?
Except of course for the look, which I cannot argue against.


Cheers,
Patrick

Actually I prefer green I don't pretend to know why caps in this position would sound different. As it's difficult to do true A-B, I may be fooling myself. Most comparisons I do fall into the "no noticeable difference", "maybe different" and "just noticeably different". For instance, in the AVCC filtering I slightly preferred silmic II to the kaisei, so I don't think I have a particular bias for the kaisei necessarily. However, for this position I am satisfied that there is a definite difference. I do admit to part bias in other things though. For the past year I fell in love with 4-pole jensens and changed most of my power supplies to accommodate them, even in the F5X. Now those really do put a dent in the pocket book.
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Old 8th November 2017, 02:05 PM   #2066
Nikon1975 is offline Nikon1975  Austria
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After last week experience the tip that I would give to everyone is to check the circuit one at a time leaving the others with input shorted. You have to be sure to see no signal in the shorted one.

I am meditating the design of the ultimate battery management/controller/ charging board. Anyone to embark with me in the his? (On a new thread?)

D
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Old 9th November 2017, 07:54 PM   #2067
alazira is offline alazira  United States
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Hi Patrick,
I went back and re-read the linear article and you do say those caps are not critical because they are carrying signal current (as opposed to voltage). Yet you did mention plans to try various caps and the PCB's have a provision for bypass caps.
Quote:
Originally Posted by EUVL
For measurement purposes, the two decoupling capacitors are not so critical. I just used a pair of ordinary electrolytic capacitors, such as Panasonic FC 100uF 16V. There is room for experiment in the eventual application, where I plan to start off using German-made Frolyt Bipolar (220uF 25V), followed by ELNA RBP 220uF 16V bipolar, and Nichicon Muse ES 00uF 16V bipolar, in parallel with WIMA MKP2 0.01uF 250V...
Did you ever try these?

Last edited by alazira; 9th November 2017 at 07:58 PM.
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Old 18th November 2017, 01:35 AM   #2068
Embehu is offline Embehu  Viet Nam
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Hello, I'm from Vietnam, and do I have any chances to buy xen IV convert PCB?
Many thanks!
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Old 18th November 2017, 02:56 AM   #2069
EUVL is offline EUVL  Europe
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I am using Muse.


Patrick
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Old 20th November 2017, 06:37 PM   #2070
savvas is offline savvas  Greece
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Still can't figure it out: in recent audition, the Buffalo DAC with Sen (300 Riv) played louder than the one with Legato (1.5V standard output). To be precise, in 64 step relay volume control, it was 10 steps louder than Legato.

Going from 680R to 300R resulted a volume reduction, ~10db (from BAT linear vol control and just some steps down with the relay one). Still, way more louder than Legato.

Upgrading all the regs of Buffalo DACs with Dimdim's LT3042 regs, was game changer and brought to the other stages (NTD1 and Legato) closer to Sen i/v sound: more neutral, holographic soundstage with accurate and better defined instrument reproduction.
The Sen Buffalo also was improved but not so much like the others, most likely because it already possessed these qualities and was in my opinion one step at least ahead the others in SQ. Now is more or less a close call but still I think the Sen is the more neutral one.

Last edited by savvas; 20th November 2017 at 06:43 PM.
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