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% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2026
\begin{circuitikz}
\draw(0,0)
to [european resistor, o-] ++(2,0) coordinate(s1);
\draw[DARCblue](s1)
to [american inductor, color=DARCblue, DARCblue, *-] ++(0,-1)
to [C, color=DARCblue, DARCblue, -*] ++(0,-1) 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] ++(0.5,0.5) 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]
(0.10,0.90) .. controls (0.5,0.0) and (0.5,0.0) .. (0.90,0.90)
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]
(0.10,0.90) .. controls (0.5,0.0) and (0.5,0.0) .. (0.90,0.90)
coordinate[pos=0.5] (min);
\end{scope}
%
\draw[color=DARCred](s4) to [open, v={$U_A$}] (s5);
\end{circuitikz}