% 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)
        to [short, -o] ++(1,0)
        node[anchor=west](){+};
    % Unten
    \draw(T.B2)
        to [stroke diode, invert] ++(2,0) coordinate(C2)
        to [short] (C1);
    % Mitte
    \draw(C1)
        to [open, name={h1}] (C2);
    \draw (T-L2.south)
        to [short, *-] (h1.center)
        to [short, -o] ++(1,0)
        node[anchor=west](){--};
    % Sinus
    \def\x{0.15}
    \draw[] (-1.3,0) sin ++(\x, \x)
                     cos ++(\x,-\x)
                     sin ++(\x,-\x)
                     cos ++(\x, \x);
\end{circuitikz}