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  1. (*steve*)

    diode question

    Those double diodes are on the same die and will track each other's temperature. Thus, they can be used in parallel.
  2. (*steve*)

    New project - 1967 oscilloscope restoration

    It's alive! The trace is very blurry despite playing with the focus. Setting the horizontal to external input gives me a spot that is nothing like circular either. I guess I have some more work ahead of me. Fun!
  3. (*steve*)

    New project - 1967 oscilloscope restoration

    Having built something to hold the new capacitors, I need to make a shield to protect them (and the acrylic) from heat. The first template was tested in a paper version Placed around the bracket it looks like this And that's kinda what I want, it stands away from the bracket. Hopefully...
  4. (*steve*)

    Monitoring battery charge with an osciloscope

    There is likely to be a current sense resistor somewhere. Typically you would want to monitor the voltage across it. A current sense resistor is unlikely to have one end grounded. The answer is to use both channels on your scope. Measure the voltage from ground to each end of the resistor...
  5. (*steve*)

    New project - 1967 oscilloscope restoration

    Here's the final design, it securely holds the capacitors in place There's an acrylic version of this and I'll post some photos when I install it.
  6. (*steve*)

    New project - 1967 oscilloscope restoration

    I've gone through a couple of iterations in my head as the how to make a bracket. I've currently settled on an acrylic frame with some sort of metal heat shield. After removing the original capacitor, this is what I have: The old capacitor has measurable leakage, reading about 3MΩ after a...
  7. (*steve*)

    What did Santa bring you?

    Santa left this for me: What a thoughtful gift!
  8. (*steve*)

    New project - 1967 oscilloscope restoration

    I'm going to have to make an entire new bracket. The existing one grips a ridge on the bottom of the original cap. The new ones don't have that ridge so a different method (and shape) will be required.
  9. (*steve*)

    New project - 1967 oscilloscope restoration

    I've removed one of the brackets holding the existing cap. The other end of the bracket prevents me from placing the caps as far back as I want to. I can't be bothered removing it right now though This is how I was planning to position the new capacitors. There ends up being about 20mm...
  10. (*steve*)

    New project - 1967 oscilloscope restoration

    I was contemplating a short aluminium bracket with cable ties to hold the caps to it. There's just enough room to place the caps with the long sides facing each other. I was thinking about a metal shield (not touching the capacitors) to protect them from heat. I could laser cut some acrylic...
  11. (*steve*)

    New project - 1967 oscilloscope restoration

    The 2kV caps have arrived! Looks like I'm going to have to make a bracket...
  12. (*steve*)

    BY409 datasheet

    Yeah, I was checking them out (and others) yesterday.
  13. (*steve*)

    BY409 datasheet

    Absolutely excellent information @bertus. Thanks
  14. (*steve*)

    BY409 datasheet

    Looking at my 2003 vintage "World transistors, diodes, thyristors & ICs" it claims a BY409 is a 12.5kV 2.5mA silicon diode. It suggests a BY406 is 350V 0.8A. These old paper books come in useful for something!
  15. (*steve*)

    BY409 datasheet

    I'm after a datasheet for a BY409 diode (and a BY406). I've found plenty of datasheets for the BY401, 2, 3, and 4. The scanned datasheet stops there :-( Any help appreciated
  16. (*steve*)

    Hard to find replacement part.

    Very nice @debe
  17. (*steve*)

    DPDT relay lifespan.

    The coil should have an indefinite lifetime, assuming it is rated to be powered continuously (and if it wasn't it would be in the datasheet). In high vibration environments, it is conceivable that the coil could fail, but that would be independent of it being powered. Similarly, in a high...
  18. (*steve*)

    Hard to find replacement part.

    The thing is, we need to be able to see fine detail to spot things like marks that indicate a possible component failure, or a bad joint, or evidence of overheating. Even that image I uploaded is not perfect. There's some motion blur, and the depth of field isn't great, but you'll notice you...
  19. (*steve*)

    Hard to find replacement part.

    This is the sort of image that is useful. Not that the image is compressed to reduce it's size (in bytes), but not it's resolution (size in pixels). I think this image was originally around 2MB, and by reducing the quality to 80% the size drops dramatically. Now, this image exceeds 100kB...
  20. (*steve*)

    New project - 1967 oscilloscope restoration

    Still waiting on the high voltage caps (they will be shipped on 20 Dec -- so I might get them for Christmas). Meanwhile, the last of the other caps has been replaced No funny marks on this one! A question:. I replaced a 10uF 160V cap with a noname 10uF 450V cap. Now I've received the 10uF...
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