% 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){};
    % Oben
    \draw (T.B1)
        to [stroke diode, -*] ++(2,0) coordinate(C1);
    \draw (C1)
        to [short, -o] ++(1,0)
        node[anchor=west]{A};
    % Unten
    \draw(T.B2)
        to [short] ++(2,0) coordinate(C2)
        to [short, -o] ++(1,0)
        node[anchor=west]{B};
    % C
    \draw(C1) to [C, -*, name={myC}] (C2);
    \draw(myC.south west) node[anchor=south]{\large +};

    \def\x{0.15}
    \draw[] (-1.3,-0.25) sin ++(\x, \x)
                         cos ++(\x,-\x)
                         sin ++(\x,-\x)
                         cos ++(\x, \x);
    \draw(-1.0, 0.25) node[]{\small 230\,V};
\end{circuitikz}