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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...

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...

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...

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...

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...

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

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...

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...

thanks skoggurra

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...

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...

no, back EMF

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

commercial type varistor that is plug and play?

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...

I think the strains will be from 0 to 100 uE but maybe to 0.1 or 1%, I don't know. it dosent really matter for the practical thoughts that go into it. they key to making this work will be in the material properties. such as the gage of the wire and resistivity and gage factor. With a wire...

tbulena - excellent! of course, im counting on this, I cant say why though, sorry mike, somewhat good.. The shield wont matter much I don't think as there is no potential on it... I can make a bridge and differential amplifer if I need it from another cable of the same length without strain...

thanks you dave and everyone.. there is no potential on the braided shielding so it shouldn't matter if it and the jacket strain too really not sure if this will work, its a very niche thing. there has to be a reason it wont work, something non ideal like the wire thickness not being uniform?

I guess copper is in the table if I look carefully

I don't know the strain we are going to get. Im guessing 1% might be high, more like 2-3 u strain but im still not sure this can work. all the references out there on unbounded strain gages only cite certain types of metals with high gage factors. such as nickel or constantan...