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sorenb

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Everything posted by sorenb

  1. sorenb

    And now what did you do TODAY?

    continuing like that, you soon end up wearing a beret, eating fois gras, smoking two packs of Gauloises each day and driving a Renault 4, while complaining about the englishmen ...
  2. sorenb

    grounded grid

    you might check the current sources:
  3. sorenb

    stax mafia circuit boards

    I might have two sets I want to depart with 2mm/4oz
  4. sorenb

    i'm on a roll... the kgsshv

    <10V offset isn't a problem. Engaging the servo should quickly get you <1V
  5. sorenb

    grounded grid

    lower the tail resistor by some ~50ohms and re-adjust
  6. sorenb

    grounded grid

  7. sorenb

    2018 PCB Group Buy with TKD pots

    seeing only a few people have signed up for Carbon boards. I have some version 6g from PCBNet 2mm/3oz, that I don't mind departing from (16.75USD/ea). If interested shoot me a PM.
  8. sorenb

    KGSSHV Carbon Build Thread

    ....same source as for the other 10m90's in your build?
  9. sorenb

    KGSSHV Carbon Build Thread

    where did you get those 10m90's from?
  10. sorenb

    KGSSHV Carbon Build Thread

    unless you've got bad 10m90's (I've never come across any) I find it peculiar that both seems to be acting up pull out one 10m90 and test it with a DMM at ohms, test drain-source: short all legs, before measure drain-source => very low ohms if you don't get that the 10m90's are probably bad if you have a breadboard you might find it useful to build a cascoded css including the trimmer, and test as previously described. If you can't adjust the current using the trimmer, the DN2540 is probably bad (I've seen that a few times) Or you can use an 8pin IC-socket with resistors+trimmer soldered to build a bug-style test CCS-fixture. .
  11. sorenb

    and now for something completely different part 3

    Very nice build Jose con grat!
  12. sorenb

    goldenreference low voltage power supply

    Yes, check your rectified input voltage ...probably too low ...or you might be pulling too much current >3A or so
  13. sorenb

    KGSSHV Carbon Build Thread

    not sure how you can measure currents like that using 18V ....sounds like something else is wrong ...
  14. sorenb

    KGSSHV Carbon Build Thread

    detach the HV rails and use the +LV or two 9V batteries
  15. sorenb

    KGSSHV Carbon Build Thread

    Have you checked the rail as described in the link I pointed to above?
  16. sorenb

    KGSSHV Carbon Build Thread

    you might find this useful, and be aware that the negative rail is identical to the positive, so the voltage ref 'ground' ref is the negative rail rahter than ground.
  17. sorenb

    KGSSHV Carbon Build Thread

    what is the voltage at the drain of the Sic?
  18. sorenb

    KGSSHV Carbon Build Thread

    check the terminal where the leads from the transformer is attached. Might also be that you populated the CPC1117?
  19. sorenb

    KGSSHV Carbon Build Thread

    only one at a time. Both will keep the amp offset ~ zero, and both are altering the operation point of the particular stage.
  20. sorenb

    KGSSHV Carbon Build Thread

    in any case the OpAmp is needed. Servo1 acts on the input, and Servo2 on the output stage rather. You need some ~ +15V offset to use the Servo2.
  21. sorenb

    Blue Hawaii BJT Build thread

    no issue running it a bit low, and leave it at that.
  22. sorenb

    Blue Hawaii BJT Build thread

    secondaries are too low for getting 400V out ... try 375V rather ...lower the two 390k to 365k, or parallel to get there
  23. sorenb

    Blue Hawaii BJT Build thread

    no current limiter, and less filtering ...if you don't want current limiter, remove 3904 rather
  24. sorenb

    Blue Hawaii BJT Build thread

    assume you GRHV voltage out is 390V under load and +404 and -410 without? what is the voltage at the drain of the Sic (middle leg) against ground? and what is the voltage between R9/R7? both with and without load
  25. sorenb

    Blue Hawaii BJT Build thread

    you need > 6.0V, 3x 1ohm might get you there, else use 4x
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