A friend of mine has a TIG welder, which uses a high frequency signal to make the start of the weld much smoother. He's noticed that the welder seems to be tripping his GFIs (works fine on non-GFI circuits). So, that got me thinking, is it possible to build a low pass filter for something like...
Hi guys,
I'm trying to make a rudimentary projector of sorts using a low power (class 1) laser diode. I'd like to shine the laser onto two mirrors: one would control the horizontal portion of the scan, and the other would control the vertical portion of the scan.
My problem is this: what...
Homework Statement
I need to find the Laplace transform of t*e-t*u(t-tau)
2. Homework Equations and attempt at solution
I know the general form of the transform, but my problem is in the time shift of the step function. If both parts of the expression were (t-tau), then I could just...
Hi all!
Does anyone know of any good sites for how to build a DIY embedded linux microcontroller?
I know that I'll need a processor of some sort (was thinking maybe an ARM device), a ROM for the bootloader and kernal, RAM for the general processing, and a JTAG or programming interface of...
Hi guys,
I'm looking at potentially dropping my computer engineering degree from my dual degree plan (EE is my other degree). I would still maintain an emphasis in computer engineering for my degree, but do you think by doing this I will be harming my chances to be employable after...
Hi all,
I have a big decision to make, and I'm looking for advice from those in the fields. I'm trying to decide whether to be a computer or an electrical engineer. For the moment, I have been dual majoring in both, but due to family reasons, I will be transferring to a new university in the...
Ah. You're entirely right! For some reason, I had written down the squares as 1, 2, 4, 9, 16...
Better moral of the story: be sure to have full stomach when doing discrete math :)
Ah. By brute force, it appears 15 won't work. Somehow, prior to eating dinner, I must've skipped over that one :P I had thought I checked up until 50.
So, I guess the moral of the story for these kinds of problems is never let elegance get in the way of plain ol' plug and chug.
Thanks for...
Homework Statement
Disprove or prove the statement that every positive integer is the sum of at most two squares and a cube of non-negative integers.2. The attempt at a solution
I'll call the numbers that can be squares a and b. C will be the cube.
The easiest way to disprove something is to...
Damn you, algebra! I shall defeat you one day ;)
Thanks! That trick worked. After I multiplied by those terms, I then multiplied top and bottom by 1/(jw). Taking the limit of this led to C1 / (C1 + C2).
Oh, and you were completely right-- that was a typo earlier-- should've been 1/(1/jwC)...
Can I see how you got this to work for the "new" A and B expressions?
Without multiplying by R, the expression is
\frac{1}{ \frac{1}{R} + \frac{1}{jwC} }
Meaning the whole thing would look like:
\frac{\frac{1}{ \frac{1}{R_2} + \frac{1}{jwC_2} }}{\frac{1}{ \frac{1}{R_1} +...
Well, I totally agree with you: intuitively, it seems that we should be able to ignore the resistors for w -> infinity.
What bugs me is the notion of "shorting" the capacitors is really just an application of looking at the capacitor's impedance as w-> infinity. In other words, it's a result...
Homework Statement
I need to find the DC and high frequency (HF) gain of this filter:
http://www.flickr.com/photos/96575810@N00/4420162040/
(The url is [PLAIN][PLAIN]http://www.flickr.com/photos/96575810@N00/4420162040/ in case that doesn't work)
Homework Equations
The book defines...
Parts, componets, and things that "do stuff"
Hi guys!
I'm actually an electrical engineering student, but I figured this might be more applicable here. I'm trying to find websites that are good for ordering parts such as bearings, shafts, gears, chains, cogs, and more. I'm planning on...
Thanks, rasmhop :)
So, with the contradiction, in order to show that the contradiction is false, can I take any set of three integers to show it is false? For example, can I simply assert there would be a ring where 8, 9, and 10 are neighbors, and thus the contradiction is false?
I'm still...