It really depends on what you are trying to do with it. There are several applications of which each will demand certain considerations to be taken into account. If you are monitoring a small signal current, you will want an instrumentation CT in the range of your expected current. As a general rule, the more turns you have, the higher the output voltage (and noise) will be. Check out some web sites like this one http://freshtransformer.com/handcrafted2.asp?run_init=1 that I pulled up with a quick search using "current transformer" for my search.
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A great troubleshooting tip...."When you eliminate the impossible, whatever remains, however improbable, must be the truth." Sir Arthur Conan Doyle
CT Design
Re: CT Design
