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About Superdad

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    Music lover; Owner, UpTone Audio

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  1. Not quite following you, other than that the StarTech USB>fiber converter is powered by computer USB 5VBUS and the Sonore opticalModule FMC (as well as lesser, garden variety FMCs) does require a modest power supply. Beyond that I'll await Jesus' explanation regarding the rationale for his interest in the StarTech. I am genuinely curious.
  2. The MSB USB>fiber solution functions VASTLY different from the way a common USB>fiber media converter! (such as the StarTech that Jesus mentioned). The USB of the MSB piece presents as a USB Audio device (driverless for Mac/Linux, drivers for Windows). Your OS and player s/w sees it as a USB audio device that you stream to. The StarTech and other USB FMCs are simply turning a computer USB port into an Ethernet port (one that needs to be assigned an IP address by a router on whatever network you connect it to). Audio is not involved--unless you have s/w and an Ethernet audio endpoint on your network awaiting that. VERY different streams!
  3. You probably read it either in an original USB REGEN thread or in this blog post of mine from nearly 4 years ago: https://uptoneaudio.com/blogs/news/20068483-usb-regen-updated-amazing-bass-all-unshipped-orders-will-be-the-latest Some few cents worth of resistors on the input ground lines was the change we made after the first 100 USB REGENs were sold (and we changed the LED from green to amber to signify). All 100 of the first buyers received the upgrade, and we went on to see close to 4,000 USB REGENs after that. The more sophisticated ISO REGEN design does not require such resistors. The 4-layer, impedance-controlled circuit board known as the USPCB A>B Adapter is meant as a pure cable substitute. Its primary application is between a REGEN and a DAC, though people freely purchase and use them in other spots. It would be problematic for us and our clients if we put ground line resistors on the USPCB Adapters as performance and connectivity issues could then arise.
  4. Form my studies of their PCBs that does not seem likely. Lots of coding key to their products going on on the middle board with big SHARC chip. https://6moons.com/audioreviews2/bricasti/2.html Yes, definitely XMOS for the USB input. Integrated onto their main DSP board.
  5. How would that be different or better than someone using your (less expensive and more optimized) opticalModule FMC—connected to the copper Ethernet port of their computer? That StarTech unit does not act as a switch or router, so as with any FMC, the computer would still need another network connection—and I recall you are not a fan of people doing the problematic “bridging” dance. Maybe a USB>fiber converter will be useful for laptops lacking an Ethernet port, but again, that fiber output still needs to go to someplace on the network which will give it an IP address. Am I missing something here my friend? —Alex C.
  6. All three of your statements are correct! (Though 100Mbps not 100MHz)
  7. Well one thing I am fairly confident in restating is that EtherREGEN will sell for about $600 (+/- $25 should not matter to anyone). Less certain--and I know this is disappointing to all (none more than me)--is the exact release date. There have been some setbacks, some technical, some otherwise. On the technical front, one of the key chips we are using (the main Ethernet switch chip) has programing issues that we are waiting for a response from the manufacturer about. And another key chip we are using (as one side PHY and intermediate protocol for going over the moat) is so new that John has been working directly with project managers at TI on documentation issues--and it has become clear we are the first manufacturer to actually design for the part (Frankly with all the work he has put into that chip and the feedback he has given them, they ought to pay him a stipend!). On the "otherwise" front is the fact that the Sonore opticalRendu (another brilliant JS design as you all know)--estimated as a 6 week diversion after the start of the EtherREGEN project--turned into a 9 month affair, with then the opticalModule tossed in at the end. Of course UpTone and Sonore projects benefit each other development-wise. This is especially so in the case of these 3 Ethernet devices as several of the key chips and knowledge to program and implement them are common between them. I am very happy for Sonore, but make no mistake, the EtherREGEN development cycle was slowed a LOT by opticalRendu. C'est la vie. The one thing I can unequivocally state is that John constantly works incredibly hard on these projects. The hours and brainpower he puts into them are extraordinary. I gamely attempt to assist when he gets stuck: he talks through the issues with me (much of it over my head), and I make troubleshooting strategy suggestions that sometimes--due to my not too close to see perspective--work out or point a path forward. I also fund rounds of test boards and order EVM boards and parts as needed. We are getting closer though. Some key tests are taking place this week, and assuming they go as planned we will move forward with layout and fabrication of the most fully-functioning version of EtherREGEN so far. It will still have lots of diagnostic monitoring connections and configurable elements that will go away on the final board, but it will move us far forward. Once that board is produced and working on the bench, I'll be much more comfortable beginning to make new estimates of launch timing. But the truth is that even if these next few weeks go smoothly, we are still at least a couple months out beyond that. So to sum up: John and I both feel the pressure. From our waiting audience for the product, but also from ourselves. If anyone is not comfortable waiting, please go ahead and make other plans. While we feel an obligation to get this unique product out into the market--where we expect it will perform wonderfully for all--we have to get it right. Of course UpTone has not taken anyone's money in advance for EtherREGEN. We always decline to do so until final boards are in production and cases are inbound. Thank you to all for your enthusiasm, patience, and understanding, --Alex C.
  8. Well there you go! A use for the VBUS switch of our USPCB A>B Adatper besides just diagnostic. And nice to see you posting again here at AS/CA Ryelands. --Alex C. P.S. "Potentially interesting error." That's great; I do like PIE!
  9. I just looked at the Greenwave page. Here is a quote from a user of their filters: “I used to dread coming home after a 12-hour nursing shift. I would often get home and have to deal with an issue or incident that my babysitter had with one or both of my children. Since installing Greenwave filters, my children are calmer and behaving much better. In six weeks, I have not had a single complaint from the babysitter.” Calmer and better behaving children. Now there's a new marketing angle! Courtesy of $0.30 worth of parts in a plastic box plugged into your wall outlet. Who knew! -------- But seriously, a better way to look at mains noise is with a scope. That way you are not trying to lump the whole spectrum of noise into a single number (based on unknown bandwidth and weighting) or simply listening to squelching noise. Of course I caution not to plug scope probes directly into your mains outlets! A small step down transformer should be used. Here is a simple device--from a professional company who proper engineers mains filters of several types--that provides both safety and a handy BNC for your scope: https://www.onfilter.com/emi-measurements
  10. For the ISO REGEN's red switch, the up ('ON') position defeats the galvanic isolation, while the down ('1') position has the isolation in effect. Why is it this (somewhat confusing) way? Because the only single-position vertical mount DIP switch available is labeled that way. For (single-pole) switches, ON is always with the two contacts closed (connected), and all we are doing to defeat the isolation is putting the switch across the "moat" of the separated ground planes--and turning the switch "ON" joins the two domains, thereby defeating the isolation. The VBUS switch on the USPCB should stay in the ON position--the way it arrives. (that is the downward position of the tiny white switch—where it then forms a line with the two white painted dots on either side). Look closely and you will see that the switch can be toggled. The tip of a pen or a pin can be used to move the center white bat of the switch. It is a bit of a joke—and really only useful for use in determining if your DAC needs VBUS. If it does, then you leave the switch on; If it does not use VBUS then well, what’s the point of tuning it off? It is not like the 5V goes anywhere. You are not even keeping it off a long USB cable (some people like that to reduce capacitive coupling to the data lines). Useful as horns on a bull (at least for us)!
  11. I have the same Entech unit. Afraid that the above demonstration is pretty meaningless since I get better results just from plugging in a $10 Mean Well SMPS:
  12. But, but Amir just published that none of this power supply stuff makes any difference and that we are all delusional. https://www.audiosciencereview.com/forum/index.php?threads/do-you-need-linear-power-supply-for-dacs.7021/page-6#post-160389 Guess you gents will all need to give up your fancy power supplies—and I’ll have to cancel everyone’s orders and take a job at the grocery store.
  13. Hi Rajiv: That's a great question. And while neither the choke-filtered JS-2 or the bank-alternating UltraCap LPS-1.2 can be considered "conventional," the physics of peak current handling are quite the same for both--other than that the paralleled LT3045 regulators in the LPS-1.2 are faster--and fairly in common with other power supplies. Yet the actual answer turns out to be far more complex than your simple question would make it seem. I just got off the phone with @JohnSwenson about it, and I think it took hime 20 minutes to explain to me. All sorts of factors, not the least of which are the duration of the current-demand spike, the inductance of the cable (lower is better), the capacitance after the regulators (larger can potentially allow for higher current but dramatically slows the supply down), and the peak current limit of the regulators. I know that is not an answer, just a list of a few of the factors. The true answer would requite plotted graphs and many hours of measuring for just a subset. Perhaps John will have some time to elucidate a bit to give folks a better sense of the topic. But based on what he explained to me, I would be very wary of power supply manufacturer claims of giant peak-current capability. Believe me, I would love nothing more than to state that the UltraCap LPS-1.2 can handle brief (10-50uSec) peaks of 4A (it might) and that the JS-2 can handle 20A spikes (it might not). But things are never so simple...
  14. Though to be fair, the ISO REGEN--with the same FEMTO clock as the ultraRendu, plus USB3.1 hub, plus full galvanic isolation--cost @BigAlMc $135 less than the cost difference between his micrRendu and the ultraRendu. And it mounts right at the input of his DAC/DDC with the help of the included free USPCB A>B Adapter. Just sayin'... I've enjoyed the microRendu/ISO REGEN combo in my system for some time. Just waiting for the opticalRendu.
  15. Another 13 JS-2 units built and going out the door today--a day earlier than promised! Now accepting reservations for the next batch of 12 (half of which are already pre-sold)--for shipment by March 28th. (Not to be catty, but it seems we may build and ship more JS-2s in a month or two than some other premium brands build in a year. ) Many thanks to all who use and enjoy the hand-crafted JS-2. I recently realized how conservatively we rate these (we quote it as 5-7 amps). Had one on the bench the other day running continuous 8.2 amps (!) at 12V (with 120/240V AC mains input; lower AC input lowers max current at 12V). Was not even hot.
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