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Type: Posts; User: wwfeldman

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    Closed: Re: Reactivate Eagle's pull-down menus

    don't know about Eagle 7.7.0
    this applies to Eagle 9.2.2:

    right click in the line with file / edit/ draw / view / tools ... etc
    select the instruction sets you want to see. (sheets / actions...
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    Closed: Re: Simulate spherical capacitor in CST

    by spherical capacitor, do you mean two concentric spheres (like a basketball and a playground ball), or do you mean two spheres whose centers are separated by more that the sum of their radii (like...
  3. Closed: Re: What is the difference of power estimation between Design Compiler and PrimeTIme

    guesstimate the worst vectors for toggling, to get a reasonable power estimate.

    test sections at a time, not the whole thing at once, to reduce test vector size and/or complexity.
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    [SOLVED]Closed: Re: Failure analysis of broken MCU

    Lesson 1: never leave a pin unconnected or otherwise fixed

    Question: why those three boards/MCU, and not any of the other 1000+
    all the other boards have the same unconnected 5 cm trace
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    Closed: Re: Advanced VHDL book recommendation

    the single most important thing you can do to improve your coding is to document it well
    use comments liberally to describe the function, inputs and outputs of all modules, functions, and...
  6. Closed: Re: MOSFET linear and saturation region operation

    i searched on "international rectifier fet gate charge" (google)

    look at


    International rectifier power mosfet basics
    figure 13
    Power MOSFET Basics - Infineon Technologies...
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    [SOLVED]Closed: Re: Failure analysis of broken MCU

    The working 1000+ indicates this is an issue with the 3 bad boards
    how detailed is the testing to determine good or bad?

    is the MCU broken, or is the board working correctly?
    is every aspect...
  8. Closed: Re: Driver Selection For 1500 watt 3-phase BLDC Motor

    correct MOSFET drive depends on the MOSFET, the load (i.e your motor), the processor, etc
    dos the motor instructions describe a typical system for controlling the motor?
    does the MOSFET data sheet...
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    Closed: Re: Power On Self Test in Automotive

    passing power on self test means everything tested works (at least right now)
    so its ok to start driving your car, or using your computer, or watching television, or ....
    as opposed to the ......
  10. Closed: Re: HELP with Schematics for magnet launcher

    are you building an Elihu Thomson apparatus (aka ring launcher)?

    https://www.education.com/science-fair/article/magnetic-levitation-induction-electromagnetic-ring/
    ...
  11. Closed: Re: Unsure about this current sensor for use in saturation current measuring circuit.

    I think the "don't wrap it twice" issue is more about protecting the hall effect device and the circuits that go with it.
    note the output saturates at +/-8V if the current tops about 55 A.

    it...
  12. Closed: Re: Does Solid State Marx Generators actually work?

    i have not found this on your current schematic, but several posts/days ago, the design
    charged on the positive side and on the negative side and it didn't get to full voltage either.

    in my...
  13. Closed: Re: Does Solid State Marx Generators actually work?

    i guess i missed it
    please show how the capacitors get charged, as the only path through the caps is the discharge path
  14. Closed: Re: Unwanted glitches on the output pins in verilog program

    From the DEO-Nano User Manual

    module simple_counter (CLOCK_5, counter_out);
    input CLOCK_5 ;
    output [31:0] counter_out;
    reg [31:0] counter_out;
    always @ (posedge CLOCK_5) // on positive clock...
  15. Closed: Re: Unwanted glitches on the output pins in verilog program

    according to
    https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=165&No=593&PartNo=2

    the deo-nano has "On-board 50MHz clock oscillator" so your clock at 50MHz should...
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    Closed: Re: Furuno crt screen burn

    Sorry.
    I don't know.
    I'll see if I can find out.
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    Closed: Re: Furuno crt screen burn

    CRT screens are a phosphor material coating the inside of the screen
    electrons fired from the cathode end of the tube impinge on the phosphor, causing it to glow

    after a while, as you observed,...
  18. Closed: Re: µC don't meet the timing specs (FPGA, counter)

    did you attach the logic analyzer directly to the output pins of the uC using only the logic analyzer wires?

    what is the specification its not meeting?
    what is the actual measurement that's not...
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    Closed: Re: Fan transformer repair, help needed

    it is possible you shorted a few turns.

    say you connected 2 to 7, 4 to 5 and 3 to 6
    the 4-5-3-6 is a few turns that are not connected to the motor, but are a closed loop in the coil of the motor...
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    Closed: Re: How to conduct this EIRENE test?

    I found this (at least so far)
    https://uic.org/IMG/pdf/eirene_srs_v15.pdf

    Page 50 PSA167D006-15 4.5Core environmental requirements

    last update 2006
    is that the right document?...
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    Closed: Re: Fan transformer repair, help needed

    you said you have three broken wires
    that's 6 ends
    there are two more ends where the wire in the coil is terminated

    ends 1 and 8 are the terminations of the wire in the coil
    2 and 3 are ends...
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    Closed: Re: Fan transformer repair, help needed

    if you have a time domain reflectometer, you can figure it out based on the lengths on the various wires.
    if not, just get a new fan
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    Closed: Re: How to conduct this EIRENE test?

    i've some familiarity with environmental testing

    EIRENE is new to me
    what is EIRENE?

    what document does (see section 4.5.21) refer to?

    you write about operational radios in the first...
  24. Closed: Re: Why some many packages for Microcontrollers

    60 pins or 100 pins??
    that is the type of question

    do you need the extra I/O?
    if not, is it worth the trade off in board space, etc?
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    [SOLVED]Closed: Re: Resistor Burning Issue.

    resistor burning can also be caused by using too low a power rating.

    one 1000 ohm burned up, but 1300 ohm, when made from 3 parallel 3900 ohm resistors did not
    because you tripled the power...
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