% Author: Dr. Matthias Jung, DL9MJ
% Year: 2021
\begin{circuitikz}
    \draw(0,0)
        to [battery2, invert] ++(0,3)
        to [short] ++(2,0)
        to [vR,-*,mirror, name=var] ++(0,-3) coordinate(c1)
        to [short] (0,0);
    \draw(c1)
        to [short] ++(4,0) coordinate(c2)
        to [stroke diode,*-*,name=diode] ++(0,2) coordinate(c3)
        to [R,] ++(-3.0,0)
        -| (var.wiper);
    \draw(c2)
        to [short] ++(2,0)
        to [american inductor,mirror] ++(0,4)
        to [short] ++(-2,0)
        to [C,-*] (c3);
    \draw (diode.south west) ++(0.25,0) to [C, /tikz/circuitikz/bipoles/length=0.4cm] ($(diode.south east)+(0.25,0)$);
    \draw(var.south west) node[anchor=south east](){X};
\end{circuitikz}