Recent content by MattyMatt

  1. MattyMatt

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

    Okay, so I made the modification so that one lead of the Current Transformer is on the midpoint, and the other is on the input/sense line to the ADC on the ESP. The behavior is that the ESP does not detect anything, I will be verifying all of my soldering and ensuring that the output from the CT...
  2. MattyMatt

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

    You are correct, the schematic above does not show a direct connection from CT to GND. The modifications I made were due to a DC BIAS, as I only want to see a positive voltage on the ESP32, the below paragraph on the same page a bit lower: 2) Adding a DC Bias If you were to connect one of the...
  3. MattyMatt

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

    Okay, so its not my best work, but if you use the diagram of ESP linked previously, or the one I attached below, things may be at least a little more clear. In the ZIP file, are the KICAD files. If you need me to export the sch file as something different, please let me know.
  4. MattyMatt

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

    Sorry about the pictures... I thought a shareable link from google would work correctly, I guess not. I have attached the pictures (file names correspond) to this post. The schematic will be on the next. @Harald Kapp - One lead is connected to the midpoint (as in the schematic), and the other...
  5. MattyMatt

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

    Harald, Thanks again for your follow up! I have some pictures at the bottom of the post. I'm working on getting at least something readable for the entire circuit, but here is a list of the pins and where they are connected: For reference, see the following pinout diagram of my ESP32...
  6. MattyMatt

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

    Harald - 1. Thank you very much for the input! I think I might have a couple of zeners kicking around, I'll have to check, but I'll order some if all else fails. 2. I'll post a full schematic with some pictures here in a bit, the mains side might be difficult as I think there are also other...
  7. MattyMatt

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

    Some back story: I have setup an instance of "Home Assistant" to use as more of a monitor for the house, but also to automate a few things. One of my projects is to provide a notification of when laundry is done in both the washer and the dryer. My washer and dryer for some reason do not have...
  8. MattyMatt

    Electronics Mortuary

    Yeah, amazingly enough, the PSU went in my friend's computer, and thankfully didn't take anything else out.... which is really nice, and doesn't happen often enough. I figured there was a little more wrong with it than just a blown fuse, just as he did... but i do like the occasional...
  9. MattyMatt

    Electronics Mortuary

    KaZAAAP Its been a while since I have been on... but my buddy wanted to see what would happen if I replaced the fuse in a 1000W EATX power supply... well, the fuse didn't blow, but we found another issue :-p Poor little regulator, cratered in less than 3 seconds, and boy was that one hell of...
  10. MattyMatt

    Tek 2230 Storage does not work.

    There is a yahoo group called TekScopes, they are an excellent group of people that are very experienced with Tek Scopes, they helped me with my 475A, along with many others here... :-) I hope this helps. Matty-
  11. MattyMatt

    Tricking a Sense Line

    I agree with Harald... Those battery banks can be nasty, though your risk may be lower, but I would still sit on the safe side. Perhaps, as Res suggested, if we knew the purpose for this modification, we may be able to suggest an alternative method that would be safer / cheaper or even...
  12. MattyMatt

    Car Radio powered by PSU

    I am assuming you are talking about a 12V car stereo (that mount in the dash), and you want to bring it inside the house to either a 110V or 220V system. If this is the case, then I would suggest getting a nice power supply (12 - 13.8V DC output) I would say getting one that is designed to...
  13. MattyMatt

    SDRAM problem

    Just a quick couple of questions: 1. Is the SDRAM Manufacturer always the same, and using the same SDRAM chips? 2. Do you have a spare unit you can use to test, or part of one maybe? Matty-
  14. MattyMatt

    frequency question

    Duke is correct, bandwidth on the higher frequencies is greater. The other thing you want to consider is the nature of the stream. Will it be analog or digital? Analog broadcast TV here in the US (which is pretty much gone), took 6-12 mhz per channel. Digital Broadcast now take 3-4mhz (pretty...
  15. MattyMatt

    Run an mp3 player on a car battery?

    Donkey makes a great point, depending on where its sitting. Duke: On the sulphate thing would a deep cycle marine battery be any different in this case? Maybe our adventurer would have better luck with something along those lines... though I would imagine the specs of the battery would be a bit...
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