% Author: Dr. Matthias Jung, DL9MJ
% Year: 2022
\begin{circuitikz}[european]
    \draw[-Triangle](0.0,0.0) -- (5.0,0.0);
    \draw[-Triangle](0.0,0.0) -- (0.0,1.75);

    \draw[thick](3.35,0.0) -- ++ (0,1.25) -- ++ (-0.5,-0.5) -- ++(0,-0.75);

    \draw(5.25,0.0) node[] () {$f$};
    \draw(3.5,-0.5) node[] () {$f_\mathrm{T}$};
\end{circuitikz}