% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2026
\begin{circuitikz}
    \draw(0,0)
        to [european resistor, o-] ++(2,0) coordinate(s1);
    \draw[DARCblue, color=DARCblue](s1)
        to [short] ++(0,-0.5) coordinate(x1);
    \draw[DARCblue, color=DARCblue](x1)
        to [short, *-] ++(-0.25,0) 
        to [american inductor] ++(0,-1)
        to [short] ++(+0.25,0) coordinate(x2);
    \draw[DARCblue, color=DARCblue](x1)
        to [short, *-] ++(0.25,0) 
        to [C] ++(0,-1)
        to [short] (x2)
        to [short] ++(0,-0.5) coordinate(s2);
    \draw(s2) to [short, *-o] ++(-2,0) coordinate(s3);
    \draw(s1) to [short, *-o] ++(+2,0) coordinate(s4);
    \draw(s2) to [short, *-o] ++(+2,0) coordinate(s5);
    %
    \draw[DARCred, -Triangle](s2) to [open] ++(0.75,0.5) coordinate(s6) -- ++(0,1) node[above]{$U_A$};
    \draw[DARCred, -Triangle](s6) -- ++(1,0) node[right]{$f$};
    %
    \begin{scope}[shift={($(0,0)+(s6)$)}]
        \draw[very thick, DARCred]
            (0.10,0.10) .. controls (0.4,0.1) and (0.3,0.9) .. (0.50,0.90)
            (0.50,0.90) .. controls (0.7,0.9) and (0.6,0.1) .. (0.90,0.10)
        coordinate[pos=0.5] (min);
    \end{scope}
    %
    \draw[DARCblue, -Triangle](s3) to [open] ++(0.5,0.5) coordinate(s7) -- ++(0,1) node[above]{$|Z|$};
    \draw[DARCblue, -Triangle](s7) -- ++(1,0) node[right]{$f$};
    %
    \begin{scope}[shift={($(0,0)+(s7)$)}]
        \draw[very thick, DARCblue]
            (0.10,0.10) .. controls (0.4,0.1) and (0.3,0.9) .. (0.50,0.90)
            (0.50,0.90) .. controls (0.7,0.9) and (0.6,0.1) .. (0.90,0.10)
        coordinate[pos=0.5] (min);
    \end{scope}
    %
    \draw[color=DARCred](s4) to [open, v={$U_A$}] (s5);
\end{circuitikz}