IMHO the floating power supply is not critical at all in this circuit.
It is just supplying the JFETs which is only drawing a constant current at Idss.
As far as I am concerned, NiMH batteries are just fine.
The signal current is in a complete different loop due to Kirchoff's law.
It does not go through the bias loop at all.
Again, I can only repeat -- read the article and understand how it works.
Patrick
It is just supplying the JFETs which is only drawing a constant current at Idss.
As far as I am concerned, NiMH batteries are just fine.
The signal current is in a complete different loop due to Kirchoff's law.
It does not go through the bias loop at all.
Again, I can only repeat -- read the article and understand how it works.
Patrick
I don't think reading the article has anything to see with previous posts apart from the fact that it needs floating supply (which I think is already clear to everyone). As others, I have not received the article YET, but I do not think that there is any rocket science involved as far as the supply of this circuit is concerned.
For some (me included), finding and charging 18V NiMH batteries is just too much of an hassle, compared to building a mains powered power supply once and forgetting about it. Different people / different preference.
If you have not seen the article, how can you judge its relevance ?
No, it is no rocket science. It is fundamental electronics which tells you what the power supply does and why it is in a separate loop as the signal. It also explain why the coupling cap operates differently then the ZEN and hence its non-linearity is NOT important.
I have no objection if you (anyone that is) want to use mains based supplies. Joachim is kind enough to post schematics for that. But I don't see an argument for using fancy shunt regulators. And I am entitled to an opinion related to my own circuit.
Best regards,
Patrick
No, it is no rocket science. It is fundamental electronics which tells you what the power supply does and why it is in a separate loop as the signal. It also explain why the coupling cap operates differently then the ZEN and hence its non-linearity is NOT important.
I have no objection if you (anyone that is) want to use mains based supplies. Joachim is kind enough to post schematics for that. But I don't see an argument for using fancy shunt regulators. And I am entitled to an opinion related to my own circuit.
Best regards,
Patrick
Because I already understood that the circuit needs floating supplies and why..... I'm simply guessing the article is about this particular I/V, its topology, and functioning.
Not about shunt regs, nor topologies of floating supplies, nor even about how the ES9018 works.
...hence why they need to be floating.... but I don't need to read the article to understand that. I catch more than enough of the circuit to understand how it basically functions....
...now....understanding why it performs so well is a totally different story, and I never pretended that I have enough background (nor equipment) to understand or find out by myself why it performs so well. As often the devil is in the detail, and that's why I am interested in reading the article.
Sorry, my bad. I had the impression that you did.... not sure if it is your insistence on using batteries throughout the thread, or the fact that you made a point on replying my post without giving any element of answer or complement to it
Nor do I.... except that as NP would say "I have truckloads of them" (and not of Joachim's) that they don't necessarily cost more than more basic topologies , and that they present the advantage over batteries not to require charging.
You absolutely are. (but it seems others are not)
Sorry to react on your thread, and if my tone is straightforward (but respectful). I felt like replying because you implied several times that I and other members do not understand even the fundamentals of the circuit, which I find disrespectful, especially when what you are pointing out is not very relevant (i.e. commenting on the need for floating supplies vs grounded when the discussion is about power supply topologies).
Being more knowledgeable than most (admittedly including me by a probably very big margin) does not entitle you to subjective judgement and condescension.
Cheers,
Fred
Last edited:
we will, when/if it ever arrives, its a bit odd that so many have not actually received the magazine yet. i'll shoot Jan an email now to see whats up. for me batteries are easier as i have already a pretty involved power supply in my dac + usb module, so simply dont have the space to add any sort of AC based supply without adding another case. I already have all the battery management gear needed to charge and monitor this many lifepo4, which i would rather use. I say this not just for lower noise and longer charge life, but because they will last pretty much indefinitely, while nimh will not; even if treated well they are effected by memory, so any trickle charge setup will lessen battery life. For me i'm looking at about 60-70hrs minimum between charges and lifepo4 are not effected by memory; although they will cost considerably more.
@ Fred, thats the first time i think ive heard someone call the Salas shunts compact hehe, many other great things, but compact? maybe more compact than the unofficial QH red pcbs. With individual secondaries and regulators for all supply lines, you are looking at a pretty massive psu for an iv stage, the heatsinking alone although not huge will not be inconsequential. with the D1 IV on the woofer channel's dac already and considering the Ackodac supply arrangement is pretty involved it would be insane and pretty much impossible for me to do such a thing myself on the second 'tweeter dac' the NTD1 already throws off 50W of heat
Last edited:
also one thing, just using 1 x buffered reference per balanced channel for bias is fine isnt it? no need to have individual ones for each circuit. probably one overall would be fine, but i dont like the idea of that re. crosstalk
Just because I wanted to be the first to post the built.
I did only the SEN now, in my zen (kinder)garden.
The evaluation setup is done like this:
1)Hiface
2) AD1865 from Quancho board, powered with three sets of four AA batteries.
3) (X)EN
4) O2 headphone amp
5) Audio Technica ATH A900
Today I had the SEN working, I plan by next week to have the CEN working as well. It sound good.
I wanted to have the possibility to swap IV easily, so I am using the best connector for the output of the DAC I had available. It's an expensive LEMO, that I have leftover from some office work.
I have another DAC board connected to a tube output stage I plan to compare. The truth is that I never manage to make up my mind which one I like more, but I enjoy the process 🙂.
Thanks to EUVL, for this interesting opportunity.
Qusp, BTY, the list of components to choose is in the article.
Have a nice WE,
Davide
P.S.: Maybe this post does not make any sense, but the wine at dinner was really good.
I did only the SEN now, in my zen (kinder)garden.
The evaluation setup is done like this:
1)Hiface
2) AD1865 from Quancho board, powered with three sets of four AA batteries.
3) (X)EN
4) O2 headphone amp
5) Audio Technica ATH A900
Today I had the SEN working, I plan by next week to have the CEN working as well. It sound good.
I wanted to have the possibility to swap IV easily, so I am using the best connector for the output of the DAC I had available. It's an expensive LEMO, that I have leftover from some office work.
I have another DAC board connected to a tube output stage I plan to compare. The truth is that I never manage to make up my mind which one I like more, but I enjoy the process 🙂.
Thanks to EUVL, for this interesting opportunity.
Qusp, BTY, the list of components to choose is in the article.
Have a nice WE,
Davide
P.S.: Maybe this post does not make any sense, but the wine at dinner was really good.
Attachments
Just replied to your email ('jeremy'). If there are others that have not received their copy of Vol 2 after a reasonable period, shoot me an email and I'll check your order. I've been loosing about 1 or 2 shipments from every 100 I send out, which I then replace free of charge.
jan
just replied to you Jan with NicMacs details, no worries, stuff happens and it sounds like at least for myself theres nothing to worry about yet. i was more worried that something had happened given a few problems mentioned here, not about any dodginess as that would be way out of character given the good communication ive had so far with you and its hardly riches. sounds like NicMac's is one of those unfortunate ones though, i would think to Italy would only take 1 week from sending?
Last edited:
NicMac please contact me via the linearaudio email, and send your order number. I'll sort it out.
jan
Nic your order was shipped 20 October, so clearly something has gone wrong.
I will ship a replacement copy Monday. Apologies for the delay.
Edit: please verify address, see PM.
jan
I will ship a replacement copy Monday. Apologies for the delay.
Edit: please verify address, see PM.
jan
Last edited:
You can now download the assembly instructions of the standard version here :
http://xen-audio.com/v1.5/downloads/111120 Xen JFET IV Instructions.pdf
As already mentioned, since we have not built and tested the Vref version, we'll wait till qusp has finish tested his, and then we shall issue a Vref instruction then. But there is sufficient information in the standard version for those skilled in the art to go ahead.
Patrick
.
http://xen-audio.com/v1.5/downloads/111120 Xen JFET IV Instructions.pdf
As already mentioned, since we have not built and tested the Vref version, we'll wait till qusp has finish tested his, and then we shall issue a Vref instruction then. But there is sufficient information in the standard version for those skilled in the art to go ahead.
Patrick
.
Last edited:
great thanks for that. ok time to dig into the k170 bag again to get 2 more matching quads. I have quads at 7.1, 7.4, 7.6, 8.3, 8.8, 9.1, 10.9, 11 and an octuplet at 6.3. i have more to draw from, so i'm thinking i have to find another 2 quads that fall around the 2 @ 7.4/7.6, or 10.9/11
btw i wonder if anyone else in this group here snagged some of the bulk foil trimmers at PCX for only 2.50 each in the bargain basement sale? i found them less than 24hrs after they were listed and by the time i emailed there were only 2 out of a lot of 13 or something left, luckily i already had 2 x 5k of the same model as these are at 10k i'll use these at Riv temporarily. pretty amazing deal
I just wanted to say I received my order. Now I just need to find the time to build it...
Thanks!
Thanks!