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  1. (*steve*)

    Doubts electrolytic capacitors

    No
  2. (*steve*)

    tinning

    I should offer to do a translation into Australian.
  3. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    Please repeat the measurements with the boards connected. Please remember to take measurements on the AC range as well as DC.
  4. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    What I mean is, were the two boards disconnected from each other when you made the measurements?
  5. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    I'm not sure which ones are negative (or do you mean that the three with the black pen markings are all connected to ground?). Can I assume that you made these measurements with the main circuit disconnected from the power supply? It looks like a regulated 3.3v output with the other floating a...
  6. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    The ribbon cable leading away from the right side of the board contains the various voltage rails. You're likely to find that one side of all the capacitors you changed ( and the other two I pointed out) have one side common. That will be your ground rail (measure voltages with respect to...
  7. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    I probably would have changed the two on the right hand side if I was already changing the others. And I agree with screwing that device to the heatsink. I assume there's nothing connected to the other side of that heatsink? Have you measured the output voltages on the power supply? I...
  8. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    Show me which capacitors you have changed.
  9. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    I have seen similar problems caused by power supply issues in monitors. However these faults often develop over time. They are also faults that tend to occur in older equipment, or equipment that has been continuously powered on for years. I would be checking the ESR of the capacitors in the...
  10. (*steve*)

    Hp 2035 monitor Check the Signal Cable

    1. How old is this unit? 2. Have you had it from new? 3. When did it start exhibiting this fault? 4. Did the fault suddenly appear, or did you have increasing difficulty with the monitor before it finally failed?
  11. (*steve*)

    Unveiling of the pedal

    Or alternately, if the audio guy plays with the EQ to reduce some of the harmonics that aren't "nice"
  12. (*steve*)

    The corona. What's the latest?

    I started to do a point by point rebuttal of his article based on what has happened between its publication about 6 weeks ago and now, but there are only so many hours in a day, so please highlight some small part of the article and I'll address it. I will not suggest that I know more than him...
  13. (*steve*)

    new original voltage doubler circuit

    My first thought was that this was a Marx generator, but you need spark gaps for that (and no diodes).
  14. (*steve*)

    Capacitor labeling

    It could also be a thermistor used as part of surge protection.
  15. (*steve*)

    Module Circuit broken?

    Yeah, it looks like you have ripped several of the pads off. For future reference, it is probably better to lever off the plastic joining all the pins before removing the pins one by one. For short single-in-line connectors like the one in this board, that process often works best. I...
  16. (*steve*)

    Detecting IR beam

    If you want to see a beam of light from off-axis you can to do something to cause scattering. (Yeah sure, there are other ways too, but they can get pretty exotic) A simple way is to blow smoke into the space where the beam is present.
  17. (*steve*)

    capacitor ESR table - different values from different manufacturers?

    I think an important fact is that there is no particular value of ESR that is ok, vs some other value that is bad for some combination of voltage rating and capacitance. My conjecture is that you'll find lower ESR values quoted in newer tables, simply because more modern capacitors have lower...
  18. (*steve*)

    Ground control to major tom

    Or intended. Another similar issue is called "ground bounce"
  19. (*steve*)

    Ground control to major tom

    Ground does not have to be your negative supply rail. Indeed, with op-amps it is usual to have a double ended power supply with the 0V rail the ground. Ground is typically connected to shields on cables, so it is important that they can all be connected together without causing problems...
  20. (*steve*)

    The corona. What's the latest?

    There has been a lot learned since the time when NY had it's spike. This has lead to better outcomes in many cases, however this can still be a really devastating illness. If you're interested, look up "medcram" on YouTube. Along with information I've received from my day job, this has been...
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