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Recent content by wwfeldman

  1. W

    Need help in simulation

    try this for using step directive https://www.analog.com/en/resources/technical-articles/ltspice-using-the-step-command-to-perform-repeated-analysis.html .op sets the operating point you have not directed spice to do any analysis suggest you use step 1000 1600 100 this should give 6 steps...
  2. W

    non semiconductor devices

    not an expert in this subject, but: it depends on what the component is made of and how much radiation it gets hit with consider a thin film resistor - enough ionizing radiation can degrade its performance perhaps also a thick film resistor capacitors are two (or more) layers of a thin...
  3. W

    [SOLVED] What does THETA (greek letter) mean in electronics?

    page 1 of the data sheet lists theta as operating temperature, -40 to 70 degrees C the web page for said device https://www.hakel.com/en/product-hsa-275-detail-153948 has quick contact information with a phone number and an email address.
  4. W

    Thevenin total resistence question

    not quite sure what you are asking. nor do i follow what you wrote. 6 ohm in parallel with 3 ohm yields 2 ohm 2 ohms in parallel with a 2A source is 4 V Thevenin form is a 4V source with a 2 ohm series resistor shorted yields the 2A from Norton version
  5. W

    Fusion360

    you didn't say what format the 3D model is this may help: https://forums.autodesk.com/t5/fusion-360-electronics/how-to-add-3d-step-file-in-existing-pcb-library/m-p/9458768#M1316 the 4th post of 9 (Jorge Garcia) writes how to do it, but the instructions are a little short this video should...
  6. W

    [SOLVED] Need to make a up down counter from 40-00 and 00-40 without resting using two 74192 ic. Pls help

    this looks like a homework problem what does 7 segment display PCB mean? when does the buzzer buzz? you gave this title: "Need to make a up down counter from 40-00 and 00-40 without resting using two 74192 ic." when started, does it count down from 40 to 00, then automatically count up from...
  7. W

    placing high to low level shifter

    I'm not an exert on level shifters, however, I will state what seems obvious: the level shifter has to go between the low and high levels, with the zener diode / transistor / resistor that accomplishes the level shift placed between the low and high levels. i'm not sure what you mean by "be...
  8. W

    How to determine the integral a partial derivative term?

    i tried wolfram alpha i typed in your expression. wolfram alpha interpreted it as i think you need to specify p(x) and n(x)
  9. W

    Upgrade Windows 7 to 11

    does your computer running 7 meet the requirements to run 11? my machine running 10 says it won't meet requirements for 11
  10. W

    LT1498CS8

    https://www.digikey.com/en/products/filter/linear/amplifiers/instrumentation-op-amps-buffer-amps/687?s=N4IgjCBcpgbFoDGUBmBDANgZwKYBoQB7KAbRACYBOAFkvIA4QBdAgBwBcoQBldgJwCWAOwDmIAL7iC5UiAzswtRk3FA
  11. W

    Mains zero cross circuit

    what frequency? you can detect a zero crossing, then wait ??? us so you can be 430us +/-50us before the next one clearly the synchronization has to take place before you try doing whatever you want to do 430 us early +/- 50 us is a large tolerance 50 Hz means a zero crossing every 10 ms -...
  12. W

    Devices to reverse hack to TV sound frequency

    i do not really understand your issue, but my daughter had some issues, that eventually were diagnosed. she has learned how best to deal with it. in the process, we did a lot of grasping at straws. if you will allow me, i'm going to grasp at straws you exchanged the tv for a new one 17...
  13. W

    PCB fuse trace has any validity?

    you can replace a fuse you cannot replace a PCB fuse trace
  14. W

    Static magnetic field rotating inside stationary toroidal coil

    the magnetic field inside the torroidal core is essentially confined to the core. there is some leakage of field lines, but it is minimal. now you put it another coil around the same core and rotate the original if the current in the original coil is DC, the flux is constant and you'll get...
  15. W

    [SOLVED] Can somebody solve this problem ?

    you wrote that your instructors results do not add up to the equation show what doesn't add up as i read the problem, there are 5 unknowns you need 5 equations to solve for the 5 unknowns and you need to grind through the algebra carefully as a side comment, most homework problems are set...

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