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Pars

High Rollers
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Everything posted by Pars

  1. Great source for Molex connectors, at really good pricing: Sager Electronics (https://www.sager.com) Shipping isn't very economical ($15 on a $35 order), but the pricing if you need much of anything makes up for it. Example: 08-52-0123 Molex KK pins, $0.143 on Mouser at 100 qty, $0.0857 on Sager at 100 qty. Two line items at 24 pieces each were $13.90 on Sager vs. $24 on Mouser. I'll have to check their other lines.
  2. Oh god, ASR. I can't stand that site. Known Topping shill as well.
  3. I built and have a GRLV that I use for my DynaFET configured for +/-30V and have used it ever since I got the DynaFET running, so probably 4 years or so (would have to look at the thread). I'm pretty sure the tantalums are 35V and never had any problem with them. I'll look later today to confirm. I never tested the MJFs or MJEs (would have to look also to see), but bought them from Mouser as I do almost all of my parts. In process of casing it so it is torn apart right now.
  4. Happy Birthday Ryan! I hope you have a great one!
  5. Happy Birthday! I know you don't post that here (saw it on FB, and it's my sister's birthday today as well). I hope you have a great one!
  6. Yeah, that could work, though I'm not sure why everyone breaks taps? Are you tapping by hand or using a drill? By hand, do a couple of turns, back out 1/2 turn or so, continue, rinse and repeat. I've never broken a tap, even on blind holes with a bottoming tap.
  7. Damn, a class act. RIP Mr. Belafonte.
  8. From recall, it seemed that the Dynahi was more clinical than the CFA3. Not that the CFA3 lacks detail at all, I guess your description of rude might be a good way of putting it. They are both great amps, I just prefer the CFA.
  9. I personally prefer the CFP3 to a Dynahi, but I have only compared SE directly. The CFP3 is probably my favorite dynamic amp, but my SE Dynafet is awfully close (and better than an SE Dynahi in my opinion). I've never built a Beta22, but have heard them at meets (10 or more years ago). I don't recall being particularly impressed then, even though I have a lot of respect for Ti.
  10. Hence the !digitalRead call. Clever.
  11. Happy belated Birthday!
  12. Tested the two C2M devices I pulled out of the Carbon board last night on one of those cheap chinese device testers. One of them tested as an NPN, the other as a MOS FET. Another new one tested as a MOS FET as well, so guessing the one that thought it was an NPN was the bad one. Tossed it.
  13. There are ways of doing that. Can't remember the exact one I used, but put Catalina on my mid-2012 Mac Mini doing this, and it worked fine.
  14. That is evoking shades of Lampizator or Ric Shultz soldering build qualities...
  15. Happy Birthday Doug! I hope you have a great one (and weekend)!
  16. Yellowjackets season 2. Has not disappointed so far though somewhat slow moving...
  17. For RK50, you can look at Octopart here: https://octopart.com/rk50114a0001-alps-7850315. Otherwise, the TKD 4CP2500s are well thought of, and the 4CP601s aren't too far behind. Much cheaper. As for board placement, I would guess those that place the board at the rear do so to keep them close to the input jacks (noise). This would normally require that the volume pot use a shaft extender and also be placed at the back. For raising the resistors, 2mm should be plenty.
  18. I rechecked all resistors and everything was correct, though I noticed that the 1M resistors ohmed out at ~750K or so on the bad board vs. around 500K on the good board. I went ahead and changed out the C2Ms. After that, the 1M resistors now ohmed out at ~500K in board. Fired it up, and the tabs of the DN2540s were now around 3-ish volts. Vce on the PZTA42s is now ~13+ volts, so SUCCESS!
  19. I'll recheck those, could have swapped them. I didn't do any mods other than changing the 174K resistors for 150K, and that was done on both boards. I just redid the bad board the other night. EDIT: you were correct, those measurements were flipped. Rechecked and verified.
  20. Took some more measurements, but still need to verify resistors (again): Also measured the DN2540 tab to ground, and noticed a difference in these which could account for the Vce difference? Coincidence? All voltages to ground.
  21. Yeah, dem der tings. I'm really doubting I need any now, but might hit you up for a couple if I determine that is the problem. You're taunting me, right?
  22. I remeasured the drains of the C2Ms to ground and they looked OK between the boards. I did a diode test of all the SMD transistors and the C2Ms between boards and they all matched (that took about an hour). I replaced the DN2540s to no avail. The offset went up a bit (18mA), but readjusted that to 17.5mA. I guess I'll replace the C2Ms next, and maybe go over the resistors once again. I'll also take a closer look at the PZTA42 voltages. I don't have any more of these, but could get some. I also don't have any 10M90s, and can't get any that I am aware of for quite some time.
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