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Computer Audiophile


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About Superdad

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    Music lover; Owner, UpTone Audio

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  1. Gee, that would be terrible. Would not want to put a huge 1 ohm resistor in series with our nice ultra-low-output impedance LPS! To go from a few mOhms to 1 ohm--that would be a waste. 🙄
  2. Hi Geoff: Very sorry I overlooked your questions from earlier this month. Both of the DACs you list require more current than the 1.1 amp limit of the UltraCap LPS-1.2. At present, UpTone's only higher current offering is our acclaimed JS-2. It is a choke-filtered, dual-output, 5-7 amp design offering exceptional dynamic performance. There are a number of aspects to its design that put it ahead of traditional transformer>diodes>capacitor>regulator supplies. About 50 of the 240 JS-2 units built in 2017 went to Brooklyn DAC+ owners--all of whom have been delighted with its performance, many in comparison to other power supplies they owned. Recently @austinpop wrote a full review of the Brooklyn DAC+/JS-2 combo. You might find it to be an interesting read. With regards to the iFi DCiPurifier: I believe that device is mostly meant to be used in-line with noisy SMPS units and not with a low-noise LPS. If you are using the Mean Well SMPS that the ISO REGEN is often sold with, then you might indeed find some modest benefit to using the iFi DCiPurfier with it. Regards, --Alex C.
  3. Yes, but for general users (not expecting people to solder resistors in-line) just using equal length DC cables will take care of that part. Still would have to match the two boards’s output voltages very closely.
  4. Many thanks for your kind words! So glad you are appreciating the refinements that our new efforts are yielding.
  5. I am familiar with what IanCanada and Arbartels are experimenting with (actually now 3,000 Farads!). There are major issues—including safety, giant size, giant expense—and without complete bank isolation they are not going to eliminate leakage from charging (and their choice of MOSFETs will not help). As seen from the ten pages where they brainstormed about what it would take to design a useable ultracap-based PS (one not tied to powering a particular low-current device), things get complicated VERY quickly—and in the end something sophisticated like our UltraCap LPS-1.2 is where you arrive. So while I am sure Ian will come up with a piece that will work (maybe with some charging inconveniences), it will very much be for the DIY crowd. As for LPS units with no output regulators: That direction also is fraught with peril (not to mention output impedances that are no better than the 2-3mOhm from our LPS-1.2, which in the end gets a bit overridden by connector resistance), and we are not about to abandon the LT3045–still the fastest, widest bandwidth, high-PSRR, ultra-low-noise LDO on the planet. Still, it is fun to see what others are experimenting with, and that ultracapacitors are beginning to enjoy their day in more audio power supplies.
  6. That indeed may be the case, and indeed at 12V/1.1A the LPS-1.2 puts out 13.2 watts. But @Cyrus is trying to find a use for his original LPS-1 units, and top voltage for them is 7V, so 7.7W max.
  7. Sorry, but while you can run our UltraCap supplies in series for higher voltages--or in series and center-tapped to make a nice bi-polar (+/-) supply--paralleling for higher current does not work, as small mismatch between units results in most all the load landing on one or the other. It takes my hand-picking pairs of boards that deliver--at a given current--output voltage within 10mV or less of each other, and then using at least 24-inches of equal length output cables to add some resistance. I have done it a couple of times, but it is not a service we offer.
  8. That's Google's AC1200 wifi mesh router. (https://store.google.com/us/product/google_wifi_specs?hl=en-US) If you click the down arrow in the power section of this spec page, it will say the adapter is 15w but consumption is 9w. So at 5V that's going to be 1.8A--outside the range of our UltraCap units. Sorry.
  9. Sounds like you need to reset the SMC (System Management Controller): https://support.apple.com/en-us/ht201295 Feel free to contact me directly for further assistance. Frankly there is almost nothing that can fail on the MMK. If your machine was working fine with the MMK installed, then your installation was correct. Most likely either your Mac is failing or the external power supply you are using has a problem. The ultimate way to prove that for yourself is to reinstall the original Apple 7.2A SMPS (you did save it and the clip, etc. right?) Keep us posted, --Alex C.
  10. Wow, great idea! LOL. But we would quickly have extremely few politicians in our government. Of coures our streets and highways would be litter-free from all that community service.
  11. Superdad

    $2000 Reference system

    Really? I recall reading in multiple places that the HD800 require a pretty serious HA to drive properly—though I certainly could be mid-remembering. I mention this because I am in the market for a set of neutral reference headphones (under $1,700). My criteria is that they not be huge, heavy uncomfortable things (I put most of the planers like HiFiman, Mr. Speakers, Audeze into that category) and that they be easy to drive. Quite a number of experienced listeners have praised the HD800 (though there are some notable critics of it and I will need to judge with my own ears), but I always shied away from them because I thought they were hard to drive. Would welcome clarification on this. Thanks, —ALEX
  12. And as the events of the last couple of years have shown, internet social media has made it easy for nations and interest groups to spread falsehoods and acrimony to successfully sow greater division within other nations. With staggering consequences—a.k.a. the Trump presidency.
  13. They are not using these things for Ethernet data, the adapters (which are purely just connectors—no active or passive parts at all) are just a means to use different CAT cables as DC power cables. Most people have move on and are either buying raw cable (CAT or other topologies with various conductors and shielding), or are cutting the RJ45 plugs off the ends and terminating with a DC plug.
  14. Superdad

    ISO Regen performance Improvement Cheap!

    Yes, well some CA member started this thread (about using Ethernet cabling as a DC cable), and since I always thought it was more generic as a tweak I asked Chris to move it out of the UpTone sponsored forum (also in part because there was some ugly bickering that I did not want to bear responsibility for). But the topic title remained the same, and the discussion wanders about. Quite typical.
  15. Superdad

    ISO Regen performance Improvement Cheap!

    The output of the UltraCap LPS-1.2 does not have any AC leakage--neither the high-impedance or low-impedance varieties--regardless of if it is charged by the included UpTone-branded 36W SMPS or someone's large LPS. The Mean Well charger that came with the original LPS-1 did not have a "DC>ground shunt" to eliminate high-impedance leakage. Our UltraCap design has always completely blocked the path of traditional low-impedance leakage, but due to the small amount of capacitance of the transistors we use (not MOSFETs BTW, those would be worse) to alternate banks, some amount of high-impedance leakage can pass through. Of course the easy solution to that was simply to never present any high-impedance leakage to the charging input of our UltraCap supplies. John's completely effective ground-shunt trick is easy, but of course it made more sense for us to source an charger that already had that built in. And we offer this new charger for $15 to those who would like it for their original LPS-1. (https://uptoneaudio.com/products/uptone-branded-7-5v-4-8a-36w-smps-with-internal-ground-shunt)