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Computer Audiophile


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About YashN

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  1. Interesting setup. I will have to do some experiments with the SMPSes here, but as I've said: my previous experiments already showed me they affect gear in more than one way, at least two ways, if not more: I need both the AC Filter and the Custom USB Connector to minimise their effects, so that's a lot of additional gear to have to put in place.
  2. There is a lot of good information and good people over there at D.A. However, be aware of certain policies in place there where your posts can be removed without warning and that you cannot say anything about mod abuse over there. If you dig, there is a lot to learn, including about the 'venerable' as a rather unsavoury character over there described it LM317... There is a lot of great information about circuit-building which can be generally useful.
  3. My threads, my rules. You're not welcome on any of my threads. Let's leave it at that.
  4. Thanks for the cool post. If you reach back to the start of this thread, and some of the few I made, you will see that there were quite obvious attempts to derail it as well. There are many threads where cool things are happening - Cornan and Austinpop are newer members who have contributed a lot from what I can see. John Swenson and others have been there for a longer time, etc...
  5. I'd rather he stops visiting my threads and also stopped being mentioned in my threads. Since you only recently made an account over at DIY Audio, I suggest you look at some of the trollish posts he has made over the years over there... Not even sure what brings him here at CA...
  6. Despite all that you wrote: I still wouldn't let you manage my Capital, i.e. not unless you showed you have expertise in that. Domain Knowledge is important. It is important you consider Computer Audiophilia as its own domain.
  7. Yet, you wouldn't let someone who is an expert solely at cooking manage your family's capital, correct? Audiophilia is its own Knowledge Domain.
  8. I'll PM you sometime about that.
  9. Hey Greg, thanks man. hope you had a great N.Y. party, all the best for 2018. Anyone with better gear can probably easily do better measurements. It's just a matter of taking the time. Totally agree. My DIY Linear PSU combines a few clever things, and a good part of those actually come from some descriptions from John, at least prior to the Regulator. For post-regulator, I had the opportunity of directly experimenting with and hearing what capacitors do at the output section. Things like why people were saying great things about Vishay and Elna capacitors. I also had the idea of testing a capacitor used in one of my old digital cameras for the Flash. It does wonders for attack reproduction. Now, however, before one gets too excited about capacitors, one has to really think about what we're doing when building an LPS with an old regulator like the LM317 which is what I did as an experiment in building my first DIY Linear PSU: - It's quite a flawed regulator, you can get better nowadays, but it's cheap - A lot of its flaws have been analysed, so if you look for them, you can find information about how to work around these - Internally, there's a lot of components in it - What you're really doing with the post-Reg components is battling non-linearities of the LM317-based circuit, while making instaneous current delivery, power transfer, impedance response + symmetry, ripple-minimisation, etc... satisfactory for audiophile use. Overall, it's not very good, but it's a good basis for learning, because if you actually take some time to build circuits with it, listen (or measure/graph or listen + measure/graph), simulate, revise, tame its flaws, then you'll learn a ton on circuit-building for power supplies. I could do much better using it nowadays, but it's far better to use newer regulators IMO. What I gained from doing this though is doing circuit design while simultaneously listening in an audiophile setup. This is *priceless*, and very different from learning circuits from books. Agree with that, if it simplifies things a lot. Definitely, I remember seeing your custom Linear PSU for your computer. Way to go!
  10. Let me know which Entreq box you have as there are several, and they do different things. The original Entreq box considered in this thread and the original post was solely focused on 'signal grounding' and had some odd properties, like the SQ effect taking some time to be heard - this only from third-parties recounting it as I haven't heard and Entreq in a system. I did build and use a rudimentary 'signal grounding' contraption at one time and still heard an improvement in SQ in my setup despite the AC Filter already being used. As for me: Having experimented with SMPSes, my DIY Linear PSU + my custom USB Connector + my DIY AC Filter, I have heard how the SMPSes affect SQ in several ways. That's why ultimately, I just want to get rid of all of them in the listening room if I can and go all Linear or some other clean form of powering.
  11. Thanks. And by the way, your existing posts on the forum about a couple of setups to try for the DAC when trying to power externally came in handy, as did some of our PMs. I am not sure why my DAC sometimes work without one of the (technically filtered) power connetions to the computer as it seems it didn't at all initially, but it now does. I suppose it could be because of the onboard battery going low sometimes. Up to them . I've found I don't get big results fast if I spend time trying to convince others. I do if I focus on my setup and my research and spend time conversing with like-minded people. Then I can listen to the fruits of my (and like-minded people's) labour while building something else. Maybe, but a Bookmark can work too. I could paste the contents in my Blog here probably. The problem with that is it becomes an area managed by Uptone. I do like 'Superbad' Alex and John, of course, but doing that we come under an extra layer of 'management'.
  12. Relevant: SMPS and Grounding A portion of leakage currents of SMPSes can be shunted by that technique. If I'm not mistaken, this is similar to what the Tripoint 'grounding' boxes are doing (albeit with some additional passive filtering and other things) because the box is indeed connected to Earth too (as opposed to the early Entreq boxes which specifically only do what they term 'signal grounding' with an external box, some additional material and no connection to Earth). So I think John found the explanation of that the Tripoint does: it is shunting part of Leakage Currents to ground, allowing this diversion not to affect system SQ as much.
  13. Wish I had taken some more pictures and captures before and after a layout change. Here again, 'just a layout change' right? That means just changing where the capacitor returns pre-regulator went (the overall schematics and circuit did not change). Huge SQ difference. What this showed me is that even at that micro level, loop areas, connections, resulting EMI/RFI, returns/'grounding' can have large effects. You can have 3 different PCBs with slightly different layouts, from the same schematics giving you vastly different results.
  14. A few other things I would have liked to do at the time I made the captures: Since the custom USB connector - by that time I couldn't even call it a USB 'cable' anymore, as there were components in a circuit computer-side as well as along the GND line - isolated the DAC quite a lot, and this was even enhanced by a custom shielding configuration - I started to think about what I was doing at the capture side. The M-Audio can be powered two ways: by its own external PSU or by USB (the same very noisy computer USB supply from the same iMac - oh no!). So here, I chose not to use the USB power from the iMac through the M-Audio USB cable, but to power the soundcard by its external power supply. However, this doesn't guarantee me that whatever noise is being transmitted via a generic USB cable from the Computer still doens't affect the card itself and therefore the measurements. I could only assume (and here for lack of time and better equipment) that since the M-Audio is a card used for music composition, so also for capturing Microphones and other instruments ar 24-bit 96kHz max, that the manufacturer did some work for the isolation (its an older USB implementation so doesn't require the more recent and previously inexistent USB 2+ galvanic isolation implementations). Secondly, the M-Audio external power supply I used was also not a Linear one... To make things better for measurements, I would have liked to: 1. Have a clone of my Custom USB Connector to use that too for the M-Audio 2. Ideally power the M-Audio by an external, low-noise battery or something like that Additionally, a few things to notice: - I specifically did not work directly on isolating the data lines. However, filtering computer-side still improves SQ. - The filtering computer-side still works when I A/B it (I installed a switch and a LED) even after I set up a custom shielding configuration for the USB Connector (which by itself already increased SQ too) What this seems to suggest is that the data lines are still affected by whatever is happening computer-side, although I am very deliberately not powering from the computer, and although I also further isolated by working on the shielding configuration. And finally this: At this point in time, I thought I had a really good setup and that any leakage currents were not passing through my custom USB Connector, so I was thinking that if I re-connected my AC Filter in the system, it wouldn't make a big difference. Here again, big difference! This is what allowed me to say last year that I have a long-term plan of avoiding SMPSes in the listening setup: the work needed to really filter out all the nasties with SMPSes is extensive: you need to ensure the interconnects do not propagate unwanted things, you need filters post-SMPS as well as filters AC-side.