# Complex Waveforms

Discussion in 'Homework Help' started by craig56, Feb 27, 2007.

1. ### craig56 Thread Starter New Member

Feb 27, 2007
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0
I have a question for my HNC can anyone help

the question is

illustrate a complex waveform containing even and one containing odd harmonics, detailing ehich orders are prescent ?????:

2. ### Papabravo Expert

Feb 24, 2006
10,340
1,850
So what's the problem?

A complex waveform is the sum of two or more simple waveforms.
The waveforms we are talking about are sine waves.
Lookup the definition of harmonic and you're home free.

3. ### hgmjr Moderator

Jan 28, 2005
9,030
214
You may want to review the material in the Mixed AC waveforms tutorial in the e-book section of the AllAboutCircuits website.

hgmjr

4. ### Steve1992 Senior Member

Apr 7, 2006
100
0
What a coincidence; I was just going to post a question on Fourier, but I found this thread, so I put it here instead:

I just want/need to know the very basics.

Am I right with the following:

Symmetrical 50 Hz square wave.
w = angular velocity = 2pif = 314 radians.
E = peak voltage of square wave.

Fundamental peak voltage = (4E / pi)sin(wt)

3rd harmonic peak voltage = (4E / 3pi)sin(3wt)

5th harmonic peak voltage = (4E / 5pi)sin(5wt)

so on....

The sum would be 4E / pi(sinwt + 1/3sin3wt + 1/5sinwt....)

My math is piss poor, so I intend to K.I.S.S.

Steve

5. ### hgmjr Moderator

Jan 28, 2005
9,030
214
The link I provided in my earlier reply in this thread provides the exact problem in it. You may want to compare your answer to the one they obtained.

hgmjr

6. ### Dave Retired Moderator

Nov 17, 2003
6,960
146
Are you looking for something along the line of the attachment. Showing even (real) and odd (imaginary) components at the 1st, 2nd, 3rd and 4th haramonics. I apologies for the sketchy drawing, I've just drawn it with my mouse!

Dave