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RF coupling transformers


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Kevin,
Here are the articles I'm talking about. It doesn't matter whether it's RF or audio.

http://en.wikipedia.org/wiki/Impedance_matching
http://en.wikipedia.org/wiki/Balun

Pay attention to the formula. If you can't figure out whether an impedance matching transformer changes the voltage or not then you need to retake basic high school level maths.

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