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Autoformers: Need Technical Explanation....

I'm not sure I understand the theory behind a transformer wired as an "autoformer." My very basic understanding of electrical theory seems to get in the way of me contemplating how a transformer whose primary and secondaries are wired together in series could "transform" one signal to another. I had always though this took coils that were not physically connected, but inductively coupled. So, what really happens when the secondary is physically wired to the primary? How does this that work? How does taking a signal from a smaller "tap" on a long run of wire (i.e., primary and secondary in series) change the impedance if the grounds are wired in common?


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Topic - Autoformers: Need Technical Explanation.... - Dr. Toobz 16:53:05 09/15/09 (5)

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