Search:

Type: Posts; User: wwfeldman

Page 1 of 20 1 2 3 4

Search: Search took 0.01 seconds.

  1. Closed: Re: Remove glitches in output frequency of ring oscillator

    since it is a test of the model of the inverter, you might want to test it the way a
    semiconductor manufacturer tests the real thing, as the goal (i assume) is to match
    the real thing as close as...
  2. Replies
    9
    Views
    362

    Closed: Re: Oscillations dying out

    does this mean that at bias of 620 mV, it dies out, as in the photo you posted,
    and that at 630 mV the oscillation does not die out?

    if so, looks like you've solved it.
  3. Closed: Re: Remove glitches in output frequency of ring oscillator

    since the time scale on the simulation in your first post is in ns, and based on
    dick_freebird's comment that the signal appears repetitive, it looks like you have a
    period of 50 ns for a...
  4. Closed: Re: Remove glitches in output frequency of ring oscillator

    i take it 13 stages works as you want it to,
    but 121 stages does not

    where does it break down? 21 stages? 37 stages? 93 stages?
    is the propagation delay the same in all stages?

    look up ring...
  5. Closed: Re: Fill irregular cavity with vacuum in CST Studio Suite

    don't know anything about CST Studio

    can you fill space with vacuum and then add air back outside the cavity?
  6. Replies
    1
    Views
    96

    Closed: Re: SMD Diode Part enquiry

    there is this
    https://www.random-science-tools.com/electronics/SMD_markings.php

    and the surface mount codebook, a searchable 80 page pdf

    although i did not find 2u in either

    you might try...
  7. Replies
    3
    Views
    219

    Closed: Re: SMPS for 5000W can be a Full Bridge

    as you well know, there are a LOT of parameters and conditions to making a quality converter,
    regardless of power level or topology

    the guidelines you mentions change with quality of switches,...
  8. Replies
    3
    Views
    260

    Closed: Re: "Current adds up in phase"

    current adds like a phasor

    if two (or more) current sources are in phase, the currents add
    sort of like constructive interference for waves

    if there are two current sources 180 degrees out of...
  9. Closed: Re: Frequency Generator XR-2206 PCB Design Missing Components

    all of the parts you pictured are fairly standard and ubiquitous
    there are multiple suppliers of all of them

    (how did you get pictures of things you don't know what are?)

    the blue three place...
  10. Replies
    9
    Views
    362

    Closed: Re: Oscillations dying out

    maybe "current starved" has something to do with it?

    maybe there is too large a load internally or externally?
  11. Closed: Re: three phase volt measurement using resistor network method

    like KlausST said your code is undocumented
    (except in a few places, where is is redundant)

    you need to document your code because:
    it makes it a lot easier to help

    a few weeks after the...
  12. Closed: Re: Microcontrollers and a lot of advice - PIC , AVR, ARM - Software - Books - Boards

    This was the discussion on a slightly different question


    https://www.edaboard.com/showthread.php?387068-Learning-psoc-technology
  13. Closed: Re: Microcontrollers and a lot of advice - PIC , AVR, ARM - Software - Books - Boards

    I suggest you stick with the Microchip PICs

    Microchip has C compilers:
    https://www.microchip.com/mplab/compilers

    from page 498 of PIC18F47J53 FAMILY Data Sheet (DS30009964C)

    Section...
  14. Replies
    3
    Views
    366

    Closed: Re: Scraping PCB causes ESD damage to IC?

    12 V being 12 V doesn't matter
    the shunt regulator regulates the voltage at the 8.3V location
    R2, R3 and R4 divide the 8.3V to 2.5 V at the reference input to the shunt regulator

    change the 12V...
  15. Closed: Re: How to brake a three phase brushless DC motor?

    you do not want to short circuit the phases as you (should have) learned when you damaged the power circuits

    three phase uses 6 switches
    you turn them on and off in a specific pattern to operate...
  16. Replies
    19
    Views
    1,149

    Closed: Re: Discrete transistor voltage regulator

    Q1 is essentially an error amplifier

    the be of Q1 and D1 form a (poor) voltage reference of 2 diode drops, or around 1.2V
    because the reference is diode drops, variations in the forward voltages...
  17. Replies
    5
    Views
    546

    Closed: Re: How does this circuit work?

    read over the posts associated with the link

    separate the opamp circuit from the comparator circuit

    remember the behavior of RC circuits when switches close or open
    the transistor q1 acts...
  18. Replies
    18
    Views
    1,124

    Closed: Re: How to solve the circuit

    @ratch
    i made a mistake
    the left side of your first equation, 5s + 15 ignored the fuse
    the resistor is shorted at t = 0- and is still shorted until the fuse blows
    therefor the 15 should not be...
  19. Replies
    18
    Views
    1,124

    Closed: Re: How to solve the circuit

    since the current in the circuit is zero before the switch is closed, (t = 0-) it must also be 0 after the switch is closed.
    the current in an inductor cannot change instantly, the voltage across...
  20. Replies
    8
    Views
    943

    Closed: Re: MOSFETs connected in series

    i have never seen that configuration
    please provide a reference that describes its operation

    simple, first round view of behavior:
    i can see this acting like a switch.
    if Vds is small, then...
  21. Replies
    8
    Views
    943

    Closed: Re: MOSFETs connected in series

    not familiar with W/L, but i do know a little about driving FETs



    please provide a sketch showing all 5 devices, how they are wired, and how Vgs is applied to each

    to turn the devices on,...
  22. Replies
    4
    Views
    428

    Closed: Re: Heat sink for power amplifiers

    according to the simulation, how much power is dissipated in the transistor?
  23. Replies
    4
    Views
    428

    Closed: Re: Heat sink for power amplifiers

    insufficient information

    what class of power amplifier?
    what frequency range?
    what is the power supply voltage?

    you want 25W output while the spec sheet says 12.5W typical and 65%...
  24. Replies
    2
    Views
    361

    Closed: Re: Dielectric distance of Capacitor

    you also need to know the geometry

    conceptually, all capacitors "start" as parallel plate or some variant thereof,
    such as concentric cylinders,

    but it just gets complicated from there
    ...
  25. Replies
    18
    Views
    1,124

    Closed: Re: How to solve the circuit

    so why doesn't equation 30-41 apply?

    what did re-thinking equation 30-39 lead you to?
    specifically, what did you change and why?

    what is the difference between the two equations in the...
Results 1 to 25 of 482
Page 1 of 20 1 2 3 4