Recent content by purejoker

hi there, I am stuck on this question can some give me a hint on how to solve the question: the question is: Calculate the skin depth for copper at 1.0 GHz . σ = 5.8x10^7 S/m, εr=1, μr=1. the formula i think that i need to use is tan δ = σ / (ω)(ε0)(εr) ω = 2nf = 2 x n x 1 x 10^9...

if i use one of these, will it do the job! if yes, which is the best to use?? http://www.dinsmoresensors.com/index.html thanks pure!

if i use a hall sensor, that means i require a magnet. but then how do i get the direction of magnetic north? thank for your ideas pure!

hi there, hope I am posting in the right place... im trying to calculate the direction of magnetic north, using electronic curcuits. what i want to do is have a board with a circle of led lights and when i place the board in different places; the light pointting to the direction of north...

Hi there, Which is best graph software to plot the following functions? 2.5 + 10/Pi sin1/4.Pi.t and 2.5 + 10/Pi ∑ 1/(2n-1) sin (2n-1)Pi.t/4 Limits for ∑ are: top = 20 bottom = n=1 I want to show the first 20 terms of this series. I’m trying to show how Fourier series is made...

x(t) = ½ a0 + Σ an.cos(n.ω.t) + Σ bn.sin(n.ω.t) this bit basically always equal zero Σ an.cos(n.ω.t) = 0 in a square wave. i get it thanks a lot!

if i increase the numbers of terms, the sines get different magnitude values to match the square wave, but all the cosines values are still zero, why is that?

the redline is flat because the terms are zero. the cosine has a dot which is zero which comes from: a0 = 2/T ∫ x(t) dt is this right?

Fourier series ... Hi, everyone, I’m new to these forums. I’m just doing some work on Fourier analysis, and just have a few curious questions, I just need to clear up, and so I understand it better. I have been playing around with the java applet for Fourier series from this website...