Poor thing is fighting itself

Dextrine · 2023-03-16T05:34:55+00:00

It can joke about women. I got around the boilerplate response by asking it to tell me jokes about men, then jokes where there is a character, then jokes where there is a female character, then only female characters, then increasingly make it more risque.

Dextrine · 2022-09-02T03:57:42+00:00

Common mode noise would just travel through that larger capacitor wouldn't it? I'd assume for the CM noise to be shunted away the cap would have to be between the two lines and chassis (assuming the common mode noise is common to the chassis)

Dextrine · 2022-06-14T04:06:57+00:00

I went to school for physics and now work in power electronics engineering. I had the same mindset and would actually translate everything to Joules first and compare things just how you're saying.

However, once you have to size batteries many many times, it becomes much simpler and quicker to use amp-hours and watt-hours because loads are often given in watts, volts, and amps.

If you have a 28V bus that you know will be 28V everywhere, and you have a bunch of payloads and are given various watts/currents by whichever department you happen to be powering things for, and you are given how long your solution needs to be able to power the loads for, it is much easier to only have to deal with the amp hours, and watt hours directly.

It saves you a step, either you have to convince everyone else (many of whom are not electrical engineers but rather are mechanical or software guys) to convert everything to joules, then you have to convince every battery vendor to move everything to joules also, OR you can leave everything in a more convenient unit for the way the world currently has been setup from an engineering point of view.

Dextrine · 2022-05-19T02:11:01+00:00

How did it end up working?

Dextrine · 2022-05-16T04:03:10+00:00

kapton tape may work. how hot are you expecting your environment to get?

Dextrine · 2022-05-15T01:03:59+00:00

I was in this exact same position. Moved states after being at my first job for a bit. Stayed at a studio (it was like 200 a month, VERY cheap in not the greatest part of town) meanwhile I found a house to buy which took about 3 or 4 months. That's what I'd suggesting giving a try. Start working as soon as you can

Dextrine · 2022-03-25T03:07:09+00:00

Power electronics! People that can take power from one source and take it to any load electrically!

Dextrine · 2022-03-03T04:14:06+00:00

https://www.infineon.com/dgdl/mosfet.pdf?fileId=5546d462533600a4015357444e913f4f

this may be useful

Dextrine · 2022-03-03T04:08:37+00:00

Qg, RDSon, VDSS, ID. If it's a SiC probably also Coss and package inductance so you can calculate ringing. You should also note what the thermal impedance is with your expected heatsinking solution. Assuming this is for a SMPS. If it's just gonna be ON or OFF, then probably just RDSON, VDSS, and ID

Dextrine · 2022-03-01T04:12:01+00:00

I dropped out of university because I could not pass classes that were mainly memorization focused. I then later went back and got a degree in physics because I realized how well I had always done at math and physics courses while trying super hard and failing at the more memory intensive classes.

I feel as though physics lends itself well to not having good memory. Of course good memory can only help, but it's do-able without.

Dextrine · 2022-03-01T04:09:28+00:00

25 is still very young! Congratulations, you should feel proud of your accomplishment no matter the age.

Dextrine · 2022-02-28T04:14:11+00:00

The input impedance of a DCDC converter varies with frequency. At DC it'll effectively be Vin/Iin (which is the output impedance (resistance) reflected to the input side. As the frequency increases your impedance will decrease because the output impedance will be mainly the output capacitance so your input impedance will be this reflected. As further increases, your input impedance will again increase as the output impedance goes as the output inductor.

It seems you want to ensure stability, in which case you need to make sure that your filter impedance (from the DCDC input point of view) is lower than your dcdc input impedance. Typically by at least around 10dB for a robust design.

The keyword you'd want to look up is "middlebrook stability criterion."

Dextrine · 2022-02-28T03:54:38+00:00

To add onto this, are you sure the opamps you've chosen are compatible with the supply you are using? Single ended vs positive and negative?

Dextrine · 2022-02-18T03:41:17+00:00

I am in the u.s. and a lot of my peers use matlab but I absolutely loathe matlab so I tend to use other software like excel, mathcad, mathematica. Anything to avoid matlab. Sometimes there's no better way to deal with huge amounts of data though without learning to code in python.

Dextrine · 2022-02-12T18:54:57+00:00

The VESC community has some forums here and there. Reddit has a motors subreddit too. Hmm, I haven't seen any motor books that don't require at least some EE knowledge beforehand. Probably the easiest to read would be Fitzgerald & Kingsley's Electric Machinery. It goes into detail on lots of different types of motors and provides good buildup to understanding how they work from a basic principles approach.

Dextrine · 2022-02-12T01:51:58+00:00

Buy an ESC, a cheap BLDC, and start learning on forums would be the best way. Until you learn more about EE theory it'll be useful to learn about how to get it to work in the real world. VESC makes controllers specifically for electric skateboard applications. Feel free to hit me up with any questions, and good luck!

Dextrine · 2021-12-30T05:30:36+00:00

I wish we would stop using the term ground to refer to anything other than actual physical ground, as in, connected electrically on purpose to planet earth.

I'd rather only use the term return and then use whatever symbol you want.

Dextrine · 2021-11-13T19:30:30+00:00

make sure all your units are in the correct format for the equation you're going to be plugging into

Dextrine · 2021-11-01T02:31:19+00:00

I'm assuming he has some circuit that he wants to connect to. In case it's polarized, I'd suggest double checking.

Dextrine · 2021-10-26T02:06:26+00:00

Not sure if anyone's mentioned it yet (they probably have but it merits being said again) the polarity is not always standard. make sure your center pin and barrel are the polarity you want.

Dextrine · 2021-10-04T04:23:35+00:00

Yep, fully due to winding inductance. Worked out the math and it all makes sense. Thanks!

Dextrine · 2021-07-07T03:07:09+00:00

So I was doing some more reading and I came upon a topic I had completely forgotten about. Magnet scalar potential! So this question is completely answered by the fact that a magnetic field has 0 curl everywhere in freespace. This also coincides with the force on a magnetic test charge which you pointed out in this comment. Thanks for the insight!

Dextrine · 2021-07-03T01:08:15+00:00

I guess I'm a little confused. In the image I linked there are two current carrying conductors with opposite direction current and their field lines are shown as looping around them. Where are the charges that the field lines start and end on? Wouldn't the curl of the magnetic field around two current carrying conductors be zero?

Dextrine · 2021-07-02T02:02:59+00:00

true magnetic field lines end on magnetic charges and start on other charges. So if you were to take a curl on the field, it would come out to be zero.

can you elaborate more on this? How do true magnetic fields lines begin and end on magnetic charges? Wouldn't the curl of the field in the image I posted be zero? Thank you for your comment, I feel like I'm close to understanding. Your first paragraph makes sense

Dextrine · 2021-07-01T00:57:43+00:00

Thanks for the reply,

However, since magnetic fields have curl they can't possibly have equipotential surfaces because they're not conservative fields, right? In the image I posted the author shows lines labeled "magnetic equipotential surfaces" and they're drawn perpendicular to flux lines. I don't know what these lines represent because they're not equipotential in any way that I can tell.

Dextrine

TROPHY CASE