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Tesla's ether theories and longitudinal waves explained in "Wardenclyffe"

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  • #61
    I found a nice overview article on mosfet ringing:
    https://www.specterengineering.com/b...h-node-ringing

    https://rudys.typepad.com/files/snubber-e-book-complete.pdf
    Last edited by kyle_dellaquila; 10-05-2020, 05:28 AM.

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    • #62
      For those interested in the "ether density detector" (EDD) described on page 4 in this thread:
      Here are the KiCAD generated production files for the PCB. (see attached zip file) The PCB should be cut in 3 pieces:
      - the right side is for use as a ATMega328 programmer (1)
      - the left side is the EDD (2) with
      - below it a JTAG to ISP converter (3)
      Parts 1 and 3 are just added because I don't have those and they may come in handy at some point.
      The EDD is very basic, just a proof of concept kind of thing. Much more functionality can be added later if it produces interesting results. It is for use with a Nokia 5110 LCD display and a 9V battery.
      I also just completed a first draft of the program. It does compile clean but I have not ran any tests with it. But if you want to see its code, please refer to the attached EDD.zip file.

      Questions and suggestions are all welcome

      Ernst.

      EDIT: I just found some errors in the EDD program, so don't use it as-is. Once I have fully debugged it I will post a working version. This one is a good example of what it takes....
      Attached Files
      Last edited by Ernst; 10-20-2020, 06:18 AM.

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      • #63
        just glanced over this thread. Mosfet ringing most if the time is solved with a 10 ohm metal oxide resistor near the gate. It not only dampens the ringing, but also limits the charge / discharge current. and thus the switching speed.

        for higher discharge a ultra fast diode can be placed parallel over de resisitor (in reverse)

        this Gate driver IC: infineon 1EDI60I12AF
        ​has different paths for charging and discharging.

        so you can use 2 resistors: one for charge and one for discharge.
        it is also isolated, so you can use it for high side switching.

        Another Idea is using zeners but they also need to be very fast

        hope this helps,
        Ivo

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        • #64
          The main characteristic that I looked at when choosing my components was speed. The 1EDI60I12AF gate driver has a typical delay of 300ns which is way too long for my design. Adding a resistor to the MOSFET gate slows the switching of the MOSFET which is also not what I want. I managed to get the ringing down to an acceptable level with some capacitors, UF diodes and a TVS. It now looks like this:
          TEK00234.PNG

          It doesn't have to be perfect as it is a signal that goes to a vacuum tube grid. And whether the grid is +150V flat or with peaks to +300V the tube will conduct, likewise -150V flat or with peaks to -300V will just block any current.
          The circuit seems to be working quite reliably now, so I hope to be able to upload the KiCAD files and BOM soon.
          (very busy these days)

          Ernst.
          Last edited by Ernst; Today, 03:41 AM.

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