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About gstew

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    Rabid Audio Tweaker & DIY'er

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  1. John and/or Alex, I just re-read the great description a few posts above and had a thought. Will the "four Gigabit "dirty-side" RJ45 Ethernet "input" jacks" connect to a non-Gigabit source? I know from a previous answer the SFP module is Gigabit only... will I have to have a Gigabit source to connect to the "dirty-side" RJ5 jacks? Likely a dumb question for those who know more about networking than I (and I thought I could get along ok, but am learning there's a LOT I haven't encountered yet). Greg in Mississippi
  2. See this thread for info on Allo's replacement, their USBBridge Signature: https://www.diyaudio.com/forums/vendor-s-bazaar/337859-shanti-dual-lps-5v-3a-5v-1-5a-7.html It is a mostly RPi-compliant device, so will work with all of the available RPi distros / player SW sets. Support effort required from Allo should be much lower, the only non-compliant part (from what they've released so far) is the need to install a USB driver for their HW configuration that also fixes the issue with USB versus Ethernet resource conflicts on the stock RPis through the 3 (fixed now on the 4). They did make a comment about support for the USBBridge continuing for some time... see post # 308. I figure the original USBBridge will end up being a lot like my Sony HAP Z1-ES... no new firmware/SW updates likely, will work with existing externalities for some time, but nothing new. So still a functioning device, but not keeping up with new developments. That's the reality of HW! Personally, I'm pretty excited about Allo's USBBridge Signature. It is like an RPi-based Sonore Ultra-Rendu, but able to run any RPi-abled Distro/SW sets. Will be interesting to see how it fares in the marketplace. BUT for people using the RPi to get an I2S signal to feed to DIY DACs like myself (or others using an I2S->HDMI module to feed to a DAC like a PS Audio Directstream) it should be about as good as we can get. Greg in Mississippi
  3. BUMMER on the EtherPCB! Consider it a request! HURRAH on the EtherRegen price. $$$'s are itching a hole in my bank account waiting to buy one! Greg in Mississippi
  4. Alex, Thanks for this... and sorry for my slow response. I haven't used the LT304x regulators in analog-only circuits much either. My main use for them has been in mixed circuits (I consider anything that is generating or otherwise processing an I2S signal to be mixed, such as an isolator board, a reclocking board, or a DAC... which of course produces an analog output). There I mostly use boards purchased from poster OPC on DIYAudio (back when he was still selling boards) or MPAudio (back when he sold raw boards instead of just finished units). OPC's board are two sections of 4-paralleled LT3042, MPAudio's are either 2 sections of 3-paralleled LT3045 or a single section of 6-paralleled LT3045. All of these boards have positions for through-hole electrolytic caps before and after the regulator section. OPC listed caps from the KYB line of United ChemiCon in his BOM. I found they worked so well with his boards that I've adopted them as my go-to standard for this purpose (where I'm not dipping into my dwindling hoard of Black Gates). My experience with them is that AFTER they go through a moderatly-long break-in, they are fairly neutral (moreso than my experiences with the Elna Silmec and Panasonic FC, which may have been a-typical) with good dynamics (better than most of the Nichicon lines I've tried). The ESR of the particular KYB's I generally use at the input of the board are a tiny bit lower than the Panasonic FC you specified. In some cases I'm feeding them from AC-connected raw DC supplies that use Jensen 4-pole caps after the rectifiers (sometimes a bridge, sometimes a center-tapped transformer with a 2-diode full-wave setup). I have looked for the ESR of those caps and haven't found it specified. So even though the literature suggests they are low-ESR, I doubt it if they won't print the value. In other cases, I'm using a 2-section board (either OPC's or MPAudio's) to parallel Uptone Audio's LPS-1/1.2's for higher current applications. Honestly, for those uses I did at one time have a current-matched pair of LPS-1's. Comparing using the 'twins' direct to the load versus paralleled through an OPC dual-section 4||LT3042 board, I preferred the latter. AND I find MPAudio's boards used in the same mannter generally produce better results than the OPC boards, I'm assuming due to the different regulator chip. AND I've heard similar results with various caps in both mixed circuits and in fully digital circuits. Good to have that confirmed by someone I trust. Many thanks! Greg in Mississippi
  5. @Superdad... Might this comment from John in one of the Sonore threads possibly mean we'll see an EtherPCB to go with our EtherRegens? Inquiring minds wanna know. Greg in Mississippi
  6. Thanks John (and Alex for your additional clarification). So I can connect any of the RJ45 ports on the EtherREGEN to the RPi ok. Kewl. AND if I got a gigabit optical FMC, I could use that to connect to the optical port, correct? Not sure if it'll be worth it, just checking. Greg
  7. Lets try that link again... https://www.amazon.com/gp/product/B01663TTCE/ref=ox_sc_act_title_1?smid=A3KXHMB5SA7Q9Z&psc=1 AND it probably helps if I also link to the specific Delock FMC I have: https://www.reichelt.com/us/en/de/en/media-conv-100base-fx-sc-mm-1310nm-2km-delock-86444-p175548.html?r=1 SO one question is if the wired Ethernet port of the EtherRegen will work ok into the 100 Mbps RPi. Going back through this thread, it sounds like it will. Let me know if I misread and it won't. So then the other question is what would be a good optical SFP module compatible with the Delock and would the linked adapter cable work. Better? Greg in MIssissippi
  8. Alex / John (or anyone more networking-aware than I am who can answer...), I'm as eager as anyone to get my hands on the EtherRegen. My audio-only computer audio setups are fairly simple yet moderately refined... RPi 2B endpoint with various I2S-connected DACs, receiving Delock FMC, sending Trendnet FMC, ZyXEL switch, Zotax ZBox PI320-W2 nano-PC as a music-file server, and a WiFi router configured as a Wifi endpoint to provide wireless control connectivity. No streaming, no internet connection at all, all devices have linear supplies, somewhat optimized (but primative compared to many of the recently hot setups). I've started taking a look at what configurations I'll try at first. I can see 3 useful configurations: - Moving the Delock FMC to the sending side and using the EtherRegen as a final optical to wired ethernet converter, retaining the ZyXEL switch and keeping everything else as before. - Removing the optical links entirely and replacing the ZyXEL switch with the EtherRegen where the sole "B" side port would provide the Ethernet connection the RPi and everything else is connected to the "A" side. I have 2 questions about using the EtherRegen in these ways: 1. Of course the RPi 2B is limted to 100Base-T 100 Mbps. I'm assuming the wired ports in the EtherRegen will auto-negotiate down to this, but thought I'd ask to be sure. Truth? 2. To use the EtherRegen as an optical networking endpoint, I'll need an appropriate SFP optical module and an adapter cable. I believe this adapter cable will suffice to go between the DeLocks and an appropriate SFP optical module: - https://www.amazon.com/gp/product/B01663TTCE/ref=ox_sc_act_title_1?smid=A3KXHMB5SA7Q9Z&psc=1 BUT what SFP optical module will work ok? TIA! Greg in Mississippi
  9. Alex, what type & size C's do you recommend for this application? TIA! Greg in Mississippi
  10. Jesus, Thanks for that info. Will be curious if the 3B works ok. Greg in Mississippi
  11. I've used stock consumer-level Trendnet & TPLink FMCs and now a slightly modified (on-board 3.3V ADM7151-based regulator to allow a linear supply... in this case an LPS-1.2) Delock FMC with a variety of DAC hats (10-12 different types) & with / without various interface (isolators, reclockers, combination isolators/reclockers) cards (3 different isolators, 1 reclocker, 1 isolator/reclocker combo) with RPi 2B's, ripped CDs source material, and no upsampling. No hiccups whatsoever. Given the more advanced implementation of the opticalModule, I expect no hiccups up to 192 at least with RPi 2's & 3's. AND as John mentioned, the 4B fixes the shared resources between the USB and Ethernet bottleneck and should work even better. Greg in Mississippi
  12. I use this technique to parallel 2 LPS-1/1.2s for several applications in my setups... one is as my reference 5V supply un-modified RPi or SDTrans384 SD card player power source for I2S streaming... another is as the 6V power into Alexey's RPi Mezzanine boards for my reference RPi setups where I have modified the RPis to remove the on-board DC-DC converter chip and feed 5V, 3.3V, and 1.8V to the RPi from Alexey's boards. Where I've done this I used dual 3||LT3045 boards I got from Stammheim on DIYAudio. He no longer sells bare boards (it is a challenging SMD build and he had to do a lot of support), but he now sells them ready-made at www.mpaudio.net. His SD-HPULN PS would work well for this as it only accepts DC inputs. The only modification I'd make to the board would be to replace the adjustment pots with good fixed .1% thin film SMD resistors for the best voltage matching both at first and over time. This is a good DIY solution for increasing the current available from Uptone LPS-1/1.2s and in the applications above (which will sorta work with a single LPS-1/1.2) the additional current headroom shows up as improved dynamics. I suspect John thought my post was a request for him to do something like this or modify the LPS-1.2 to do this. That was not my intent John... I already have a good DIY solution. Sorry for the confusion! Alexey's boards at LDOVR.com should work well for this application too. If you want to do this with his products, I'd suggest using 2 of his LT3045-1A5 Ultra Low Noise LDO Voltage Regulator boards (3||LT3045 each), again using .1% thin film resistors for good voltage output matching. I have just about as many of LDOVR.com's great products around as I have MPAudio.net's. Using them in concert with the great Uptone Audio LPS-1/1.2''s transformed many of my DIY efforts! Greg in Mississippi
  13. LOL... How far do you want to go? See some of what I did to mine in this thread on DIY Audio: https://www.diyaudio.com/forums/digital-source/252985-sony-hap-z1es-hi-res-source-2014-a.html Greg in Mississippi
  14. Doak, Good to know you are near. Not a lot of other Audiophiles that I've found here in MS... especially wild DIY'ers AND especially in the rural northeast MS. I DO get down to the MS coast 1-2 times a year, will reach out to you! BTW, I vaguely remember you may have been the one who sent me a sheet of Dynamat Extreme for damping the bottom of a Well-Tempered-Lab turntable back in the late 1990's or early 2000's. If that was you, thanks again! No I2S on the QLS player puzzled me... then I checked and it was the QA660, currently out of stock, that had I2S output. Looks like they discontinued that model. On the QA661, I2S IS surely available on the board somewhere, maybe inquire if they can provide information for modifying it to bring it external? I'll look at the Shinrico unit. Later! Greg in Mississippi
  15. The Granddad of SD card players is the SDTrans384. You can see the large thread on it at DIYAudio here: https://www.diyaudio.com/forums/digital-source/142562-microsd-memory-card-transport-project.html?highlight=sdtrans384 AND info on how to get one when the infrequent group-buys are run here: https://www.diyaudio.com/forums/group-buys/260565-gb-sdtrans384-micro-sd-card-digital-transport.html?highlight=sdtrans384 BTW, Tachyon is doing a run of the units right now, with the last price I saw about 43,000 JPY (about $400 USD). I've been running one as a digital source for 3-4 years now, feeding a wildly modified Soekris DAM DAC. I modified the SDTran too last summer. It's been the main digital source in one of my systems for about 2 years now and I listen to it on a daily basis. Here's my setup as of a couple of years ago before my latest mods to both the SDTrans and the Soekris DAC and my latest power scheme: The SDTrans384 was designed by pretty fanatic Japanese audiophiles. The unit, like most digital audio gear, performs better with very good power. At one point they were using large light bulbs to feed solar cells to power the player and their related DAC. Most recently they have been using a fairly extensive set of AC-connected supplies... see picture. I power mine with 2 Uptone Audio LPS-1.2's with each feeding 1/2 of an MPAudio MD-HPULN power supply and the outputs of each half paralleled to provide a lower output impedance (the current draw of the player is less than 500mA). It has S/PDIF, PS Audio-styled LVDS I2S over HDMI, and logic-level I2S outputs and will play up to 384 & DSD256. The SDTrans384 does not decode FLAC or other compression schemes (that's how limited the FPGA is!), the TiNaHiFi one does some. Ok, it is my favorite and best digital source. AND I suspect the much less expensive one in the TirNaHiFi thread will challenge it after appropriate mods, though I also suspect applying the same mods to the SDTrans would keep it ahead of that challenger. I have a couple of the TirNaHiFi ones here from regular Ebay to modify & compare. BUT the best output of the SDTrans384 is the I2S AND that is the only output of the one on TirNaHiFi, which doesn't do you a lot of good, Doak. I looked strongly at the QLS QA661 when it first came out and have followed ECDesign's monster TDA1541 DAC DIYAudio thread for years, where he chronicles his DAC developments over the years and occasionally drops hints on his SD Card players. I my thoughts, after digging into the QLS units as much as I could without having one, was that the SDTrans384 was probably a better sounding option the way I would use it. I'd say anything by ECDesigns would be top of the heap, with the SDTrans384 a good strong second along with possibly the TirNaHiFi player. BUT they are DIY projects with no USB output. Alex nails it above. Getting USB output would require a full computer of some sort... and you'd be back in USB optimization world. The SDTrans384 uses a fairly dumb FPGA for processing, the TirNaHiFi card a small ARM processor. I don't see anyone doing that in the near future, playing off SD Cards is super hair shirt and it took me awhile to get a sufficient amount of my library on SD Cards to keep me satisfied 90% of the time. Most people won’t put up with that AND no streaming… not a sufficiently large market. BUT given the Lampizator’s DIY roots, you might ask what it would take to modify it to accept an I2S or I2S over HDMI input, especially if they could retain any other existing digital source selections. That MIGHT give you a chance to have your cake and eat it too, for a price. Still, the limitations of SD Card playback alone (AND I don’t stream at all) have me trying hard to get my other main I2S sources (mostly Raspberry Pis) up to the SDTrans384 level. I was heartened that when I modified one with linear regulators replacing the on-board DC-DC converters and with a dual LPS-1.2 / MPAudio power supply as above, it was about as good as my SDTrans384 setup with a lower-quality power supply. I now am watching what Allo.com is doing to make some improved SBCs… that might be what puts them over the top. OR once the EtherRegen is available, maybe the expected isolation of any prior network gear may push what I have now into that same level. We will see! In the meantime, I’m buying a 2nd SDTrans384 so I can further modify the one I have and have a backup if I break it! Greg in Mississippi
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