Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by ultrasoundguy2

  1. ultrasoundguy2

    current limiting

    sorry I offended anyone. I guess I was alittle offended by someones 'homework assignment' comment. my comment should havfe been better stated. what I post is intentionally vague, it would make sense if you had more details. we will have to leave this as something that cant be answered. ive...
  2. ultrasoundguy2

    current limiting

    I appreciate everyones efforts, no one was able to come up with a solution though. Like I said previously, the power source needs to be a shunt regulator, I know there are other sources. I really don't care about the reason why the BJT get hot, I knew the basics, it side tracked the topic...
  3. ultrasoundguy2

    current limiting

    I am using a diode to bias a BJT in order to regulate voltage to a load. See attached image (top) This top circuit in the attached figure works well and this concept of diode regulation cant be changed. The problem is that if the load fails as an open circuit, all the current is forced through...
  4. ultrasoundguy2

    interpolating in time domain to improve FFT frequency resolution

    Im trying to interpolate time domain data to improve the FFT resolution. Im not sure what Im doing wrong but Im getting a larger amount of bins but not decreasing the frequency spacing between the bins. I think Im doing something wrong or otherwise have made a mistake in theory. It should be...
  5. ultrasoundguy2

    50 ohm cable modeling

    id like to model a long 50 ohm cable in orcad layout There is a module called 'tlossy' for transmission line modeling. Tlossy seems to work under fixed conditions.. However, Id like to have the power supply on one side of the cable. Then on the other side, a load. The low side of the load is...
  6. ultrasoundguy2

    distortion in 1MHz power OP AMP

    hi ComcoKid. this was actually a pretty good idea. It wasn't the problem though. Ive given up on this product in the mean time thanks
  7. ultrasoundguy2

    distortion in 1MHz power OP AMP

    hi all. really struggling with an issue Im having with a power op amp. We are getting a distortion in the output waveform, a copy of it is below http://files.engineering.com/getfile.aspx?folder=34a5a1e3-f22d-46a6-81ca-1556ef06161e&file=distrotedwaveformj.jpg we are driving a capacitive load...
  8. ultrasoundguy2

    orcad layout - convergence

    I would like to add a multiplication element to an orcad capture simulation.k ideally any frequency mixer IC model could be better than this element.. i can put in two DC signals and get a proper scaled output however, i get convergence problems when I stimulate it with an AC signal Ill...
  9. ultrasoundguy2

    supression of back EMF from ups

    thanks skoggurra
  10. ultrasoundguy2

    supression of back EMF from ups

    I believe its when its turn off that I think you get the back emf rather than on? when you turn it on it creates a dip in the mains though (opposite direction) The information is not something I have no direct experience with. From what Ive been told, all commercially available (and wired) UPS...
  11. ultrasoundguy2

    supression of back EMF from ups

    from what has been reported to me, when the powered on / plugged in, it can create a back emf that can create a voltage transient. I didn't believe it much either but figured somewhere here might. I have seen inrush currents on the order of 30amps though that trip breakers. but this is a unique...
  12. ultrasoundguy2

    supression of back EMF from ups

    no, back EMF
  13. ultrasoundguy2

    supression of back EMF from ups

    what about line filter? those are more for frequency based filtering though?
  14. ultrasoundguy2

    supression of back EMF from ups

    commercial type varistor that is plug and play?
  15. ultrasoundguy2

    supression of back EMF from ups

    Ive need to isolate wall voltage (powered from small generator) from a EMF generated by a UPS. It is a large UPS, it is powering a power supply rated for 1560 of which is supplying about 300V and 0.5A to an instrument. From what I understand, most commercial UPS have a back EMF which is normally...
See more

Part and Inventory Search

Back
Top