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About Helium

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  1. Where are you? I've got lots of them, new, maybe 20 of each.
  2. Lol the above board seems to incorporate amb's sigma22)) Unlike Kevin, Ti is definitely not happy when this happens))
  3. Check this video by Haas: You may want a special tapping drill to make thread go deeper in the limited depth of blind hole.
  4. Thanks, I've already start thinking angle grinder FTW to butcher my nice completed T2 PCB. Just kidding, I would do it on CNC if that happened. Kevin, so how do I wire, simply each PS board to each channel (=half T2 board)? I'm afraid I will encounter heavy ground loops.
  5. Quick question. Do I need to cut T2 PCB in halves to separate GNDs if I'm making dual PS, one for each channel (double the number of PS boards and double the number of transformers)?
  6. If you are making a separate +15/-15VDC power supply board (GRLV), you can do with two Bias GRHV PCBs.
  7. If you use MLCC C0G/NP0 grade, I doubt the difference will be audible. Or, MLCC will be even better. At least amb votes for them: https://www.amb.org/forum/about-building-beta24-t3688-10.html?hilit=mica#p34356
  8. Beautiful! Kerry, how did you treat the chassis to achieve polished surface? Seems to be steel, not aluminum? Is is mechanically polished or galvanized?
  9. Can you keep the physical size and standoff hole placement same to GRLV with RS402L (goldenreference6d.zip)?
  10. Just wanted to share one of my most favorite acquisitions among hundreds of manual and electric tools. Heinrich deep throat is capable to punch holes in the center of 400mm panel (hello large enclosures like Modushop Slimline). No burrs, very clean holes, any hole is perfectly perpendicular to surface, and waaayy more accurately positioned than made by drill bit as you can never avoid drill bit wandering. Precision is close to CNC milling. I also use smaller punch Roper Whitney XX with smaller throat.
  11. Apparently a good tool, will get one. Wish it had No-mar teflon face like some countersink microstop limiters.
  12. You will need 1 x HV board with bias section and 1 x HV with +/- 15VDC low voltage section. If you populate +/- 15VDC low voltage section on one of HV boards, you don't need separate GRLV board. If you go with separate GRLV board (more luxury solution), you can use either single GRLV board producing both positive and negative 15VDC, or split boards, each producing +15VDC and -15VDC. Also, if you go with separate GRLV board, you can do with 2 x HV boards with bias section (saves money if you order boards at PCB house). You need to populate bias section on one them only. Correct.
  13. Actually it depends of user's cables. If these are highly capacitive, it may start to oscillate, who knows. Ferrite _may_ help with it.
  14. For me it doesn't look like IC (THAT) related issue. Does the hiss increase as he turns the volume up? If yes, then it's likely to be some grounding issue. Otherwise it may be oscillation (though I don't know if dynalo is prone to oscillation). Let him try to temporarily fasten hinged ferrite cores on either headphone cable or input cables or both and see if it makes difference.
  15. Digikey? Bought from them 1 week ago 50 pcs, still available.
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