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% Author: Dr. Matthias Jung, DL9MJ
% Year: 2020
\begin{circuitikz}[american]
\draw (0,0) node[transformer core](T){};
\draw (T.A1) node [ocirc](I1){};
\draw (T.A2) node [ocirc](I2){};
\draw (T.B1) to [short] ++(1.0,0) coordinate(C1);
\draw (T.B2) to [short] ++(1.0,0) coordinate(C2);
\draw(T.A1) node[anchor=east]{a};
\draw(T.A2) node[anchor=east]{b};
\draw(T.north) node[anchor=south](D1){\small 1:4};
\draw(D1.north) node[anchor=south]{\small ü};
\draw(C1) to [european resistor, l={$R$}] (C2);
\end{circuitikz}