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gepardcv

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Everything posted by gepardcv

  1. ugh, sorry! I meant the IEC ground (the third non-hot non-neutral wire).
  2. Finished my KGST. It sounds spectacular with a 207, wish I had a 007 or 009 to try it with! With headphones plugged in and nothing plugged into the inputs, there is a buzz or hum with the volume pot turned way up. With an input plugged in, dead silence across the entire range. I must have a ground loop or some other wiring problem, but I don't understand it. I used a simple grounding scheme: IEC neutral ground, transformer, PSU, and pot all star grounded; amp boards connected to PSU ground terminals and not star grounded. Any idea what might cause the problem? Edit: Fixed typo, of course I didn't short the AC to the star ground...
  3. Looks like many people switched from v2 to v3 boards since the last time I checked the spreadsheet. Will there be a significant price difference between the v2 and v3 run based on the quotes you have seen already? I don't have a technical preference for one or the other, so should probably go for the cheaper one. If they end up costing about the same, I guess I can just stay with v2 boards.
  4. What non-STM 7815/7915 parts with insulated tabs are there? I'm having trouble finding anything on Mouser. Doing searches for linear regulators, +/-15V, TO220F packages. If there isn't anything, and if we think the STM parts suck, the PSU boards probably need space for heatsink insulation pads.
  5. Speaking of the new power supplies: what is the procedure for adjusting the output voltage? Unlike the KGSSHV or KGST-mini, no zener string on these (except for the bias one).
  6. Wait, that's the opposite of what I wrote. Now 4 means "4 sets, each consisting of 4 left and 4 right boards, for a total of 8 PCBs"?
  7. Mine is correct as of now (also edited my original request post to add some LV boards for potential future Dynalo builds). I assume that entering "4" for any split board means "2 sets, each consisting of 2 left and 2 right boards" or "2 sets, each consisting of 2 positive and 2 negative boards". We absolutely should cover KG and mwl168's board costs!
  8. Meaning that downgrading from 680uF caps is a bad idea, and therefore a 3U box is required?
  9. See attached image for a sketch for both 388 and 288 cases. There isn't much room for error, unfortunately. Even shaving off 1-2mm off the boards would help them fit. They will likely fit as is, though (maybe with Kapton tape along the back and front panels, since they will touch the boards). Since we just barely started discussing transformer specs on the main kgsshv thread, it's hard to know what SumR or Toroidy can do (or if r-cores make more sense, and how large they need to be). If the whole thing can fit in a Galaxy 288, then with 5cm sinks on both sides, the entire amplifier will be the size of a Galaxy 388 case, which is quite compact. That said, even a 388 with sinks is fairly reasonable. It'll fit on all but the smallest desks. As for sinks, I would be delighted to find ones angled upwards, like on Justin's BHSE.
  10. The Dissipante line is much wider. 450mm, larger than any Galaxy case.
  11. With the latest matching board sizes, a horizontal mounting setup fits in a Galaxy 388 (not much room to spare on depth). Transformer in the middle, ideally it would be tall and skinny. With a creative setup, it might just be possible to use a Galaxy 288. The amp boards go on the top panel, possibly inverted, and the transformer sits beneath them. Then the transformer would have to be short and fat. Major problem with the Galaxy series is replacing the stock sides with true heatsinks. Has anyone ever asked Modushop about doing this?
  12. Have we decided if the split PSU on this GB is the fat or skinny version (or both)? Aside from size, the difference between the fat and skinny is the orientation of the angle bracket holes, yes?
  13. Thank you for organizing this. I'm in for 2 sets of v3 amp boards (4 total), 2 sets of split PSU (fat version, 2 left, 2 right), and 2 sets of split LV boards (2 left, 2 right). Edit: Switched to v3 boards.
  14. Considering all the questions coming in about voltage ratings for the caps on the PSU boards, would you considering updating the silkscreens (for both dual and split) to include all those notes? 1kV for the 330pf, 35V for the 47uF (and note that tantalum is needed). Maybe some others I missed. Should reduce the number of noob questions in the future.
  15. The amp boards look great and I really like the idea of the split power supply. Certainly makes case selection more flexible. It seems like it might even be possible to partially overlap the amp and PSU and go for a shorter but taller case.
  16. This looks really nice! The main reason to use this over the Carbon servo board from earlier is size, right? A few small requests for the silkscreen to make it completely self-explanatory: 1. Add voltage ratings for all caps that don't have them (1uF by the servo, 5pF, .47uF at the bottom). 2. Add an OR next to the LSK389/K170 spot, like on the KGST. 3. Labels for the the 100ohm trimpots. Not sure what they do.
  17. No offense taken at all, that's kind of amazing, why did you think I'm in Germany? I live in San Francisco now, and was in New York for a long time before that.
  18. My HP48GX (along with many other things) didn't survive Hurricane Sandy. I still used it occasionally, too. The iOS emulator is good, but not quite the same.
  19. @mwl168: Two sets for me. Are you thinking of doing the SiC PSU?
  20. I have boards marked 0.41, and both heatsinks look grounded to me. I checked against the ground lead on the 5-position terminal block with the HV in and signal out. Anyone want to double-check?
  21. I use iTEAD Studio (http://imall.iteadstudio.com). 2oz copper, 1.6mm or 2mm boards. No complaints so far.
  22. In case anyone still wants Dynalo boards, I have one set left. It's the slightly older MPSW/MPSA version that requires the simple capacitor grounding jumper fix that Kevin pointed out a couple of pages upthread. (I also have several extra protect3 boards.)
  23. Is the filename of the schematic supposed to be "goldenreference"?
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