I got a transformer from a CRT tv (it is NOT a flyback transformer). It has four wires, two on each side. One side, theres a Blue and Orange wire, and on the other side theres a White and Yellow. If I plug 9V into the orange one, and touch the negative side to blue, it makes sparks. I have pictures.
If I connected the positive to white and touch the negative to the yellow wire, it does makes sparks but they are less prominent. If I connect + to orange, and - to white and touch white and blue, it measures at 8.42V on my multimeter, but makes some sparks, and shocks me. So I have no idea whats going on, I think it might be a current transformer but then the voltage would be lower.
UPDATE 1: @mguima @Marcovecchio That comment made my day ;). I do infact own a multimeter, it's not the best, but it works pretty well. I don't own a sinusoidal generator, and I'm guessing it generates a sine wave. Anyways, back to my multimeter. It's lowest setting for resistance is 200. I've discovered this:
Resistance: Orange/Blue: 1.9 Orange/White: doesn't read Orange/Yellow: doesn't read
Yellow/White: doesn't read Yellow/Orange: 148.2 Yellow/Blue: 0.00
Blue/White: doesn't read Blue/Orange: 3-2 Blue/Yellow: doesn't read
White/Orange: doesn't read White/Yellow: 148.2 White/Blue: doesn't read
For reference, doesn't read means that nothing changed. By default, the multimeter reads "1", until I hook it up. So when I say doesn't read, it means that the one didn't change. If it "didn't read" I would check all the setting for resistance on the multimeter. I think the one might mean a resistance higher than my multimeter, which is 20M. On one hand, I'm spooked. On the other, I think Blue/Orange are a pair and Yellow and White are aswell. I'm actually happy, because that matched exactly with what Marcovecchio said! One winding should be in a few hundred ohms, and one just a few ohms. In this case, yellow and white are the few hundred ohms, and blue and orange are just a few.
I'm going to test the voltage ratio, then report back. Should I use a 9V, or my 6V 2.9Amp battery?