Hi guys. I'm a noobie to this game and need some help for a simple project. I need to know how many turns of wire needed to make a 220 microhenry choke on a ferrite torroid core. According to the article that describes the specifics, the wire is to carry 6 amps peak for a few microseconds at a repetitive rate of 1000 Hz. I've gone through the inductor creation topic but can't make heads of the formulas posted. My torroid core is 10.0 mm inside diameter and 17.0 mm outside diamter. Its height is 8.0 mm. I certainly don't know its AL or permeability and I don't have any test instruments like the mentioned oscilloscope/signal generator, hence I can't verify the inductance of the resulting product. I just need a little information that will get me aproximately that much inductance. Thanks for any help.