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Kevin Weddle

RF coupling transformers

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Impedance matching transformers don't match impedances at RF frequencies.  RF range transformers used for signal coupling are often step down transformers which increase load impedance, or they are used mainly for resonance. But they are hardly ever used in many circuits. Is it because they produce signal distortion?

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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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