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  1. (*steve*)

    Heathkit Condenser Checker

    Ok, so the sun has set, but before it did I replaced those two electrolytics. I also touched up most of the solder joints and measured the resistor across the filter capacitor. That resistor had gone a little high, and that may be part of the reason for the higher than expected V+. I may...
  2. (*steve*)

    Heathkit Condenser Checker

    The resistor values are mostly remarkably within tolerance. One has gone high, one is currently across a capacitor, and the last one can't be located! Many of the resistors (10%) are well within 1%!
  3. (*steve*)

    Heathkit Condenser Checker

    Voltages are all over the place. The 458VAC from the transformer is within spec, but I had to double check what I was reading when I measured the +150V rail. This started closer to 300V and then dropped, and continued to drop as long as I measured it. The -410V rail is also low, measuring...
  4. (*steve*)

    Heathkit Condenser Checker

    Well, it kinda works. It is close, but by no means accurate in it's capacitance measurements. The leakage test function delivers half or less of the expected voltages, and on the highest voltage range detects a good cap as leaky. I strongly suspect that some of the older capacitors are leaky...
  5. (*steve*)

    Heathkit Condenser Checker

    Thanks for the links @bertus.
  6. (*steve*)

    Heathkit Condenser Checker

    Here are two capacitors, both 8uF, similar voltage rating, and old. However, I'd the smaller one a replacement? And that's no way to treat a radial capacitor!
  7. (*steve*)

    Heathkit Condenser Checker

    Here is an example of one of those solder joints
  8. (*steve*)

    Heathkit Condenser Checker

    First look inside: And underneath: It's a bit dusty, the transformer clearly has a single primary winding, and a couple of capacitors seen to have been replaced. Some of the soldering looks pretty rough, but it's probably mostly functional. The getters on the tubes are still nice and...
  9. (*steve*)

    Heathkit Condenser Checker

    It's hello together with a pair of what appear to be self tapping metal bolts. As you can see, the case is in pretty rough condition, but I don't base my purchases on looks. I go strictly on price!
  10. (*steve*)

    Heathkit Condenser Checker

    It's a really nice warm sunny day, so what better to do than to sit outside and restore something old and electronic! This is what I'm going to be working on today: I have no idea how long it will take me (I guess it will be more than one afternoon) but I'm going to be posting in real...
  11. (*steve*)

    60 GHz rf meters

    You and your facts! I bet you think that evidence that 5G doesn't use 60GHz is some sort of evidence that 5G doesn't use 60GHz. Why would you think that?
  12. (*steve*)

    60 GHz rf meters

    A 5G phone or other 5G device will likely give you an idea of the signal strength.
  13. (*steve*)

    Help fixing Digital Multimeter Proskit MT1210

    WOW! You are indeed lucky that those resistors took the brunt of the overload. Since the 680 ohm resistor(s?) got it in the ballpark, now it's the time to get some precision 600 ohm resistors. If you're in the US I would recommend digikey. Something like this would probably be ok.
  14. (*steve*)

    COVID-19

    Because, or in spite of, it doesn't matter. Single states will have a hard time dealing with this alone if they are strongly affected. I was heartened to see groups of states cooperating, including some having "dissimilar" political leanings at the highest levels.
  15. (*steve*)

    COVID-19 Human to Human 'Proximity' Logger

    Or you could use a phone to log which phones it had been near (and when, where, and for how long). This is the basic design of several government sponsored phone apps. Needless to say, there will be a large amount of push back, and not just from the lunatic Fringe. Even in a very socially...
  16. (*steve*)

    COVID-19

    Yep, that is an indication that actions taken are controlling the spread. The growth rate in many areas of the world is now closer to linear than exponential. The next hurdle for many countries will be determining how and when they will reduce the restrictions they've put in place. There is a...
  17. (*steve*)

    Help fixing Digital Multimeter Proskit MT1210

    I doubt that resistor is 59.8G. leave this alone for the moment. I would advise that you replace the open 600 ohm resistor. You probably won't find a 600 ohm replacement, 560 ohms will be close enough to see if it's the extent of your problems. The 600 ohm resistor that is reading high...
  18. (*steve*)

    Current sensing using transformer - how to limit inrush and false sense

    @MattyMatt It is far better if you upload your images here than trying to link to another website.
  19. (*steve*)

    Coronavirus transmission prevention device.

    Fortunately, it looks like the US has gotten things partially under control. The rate of increase seems to be more or less linear recently. However, India is about to hit 10,000 cases. If both the US and India continue at the same rate, India will pass the US in about mid May. I expect India...
  20. (*steve*)

    Detecting horizontal position

    Yeah, considering how small accelerometer chips are...
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