% Author: Stephan Kregel, DG1HXJ
%         Prof. Dr. Matthias Jung, DL9MJ
% Year: 2022
\begin{circuitikz}[american]
    \ctikzset{
        resistors/scale=\getDarcImageFactor,
        capacitors/scale=\getDarcImageFactor,
        inductors/scale=\getDarcImageFactor,
        transistors/scale=\getDarcImageFactor
    }
    \draw(0,0) coordinate(u0)
        to [short, o-*] ++(1,0)
        node [rground](){}
        to [short, -*] ++(1,0) coordinate(u1)
        to [short, -o] ++(8,0) coordinate(u4)
        node[anchor=south](){--};
    \draw(u0)
        to[open, name={h1}] ++(0,3)
        to [C, l={\qty{6,9}{\pico\farad}}, o-*] ++(2,0) coordinate(o1)
        to [short,] ++(1,0)
        node[npn, tr circle, anchor=B](T){BF\,224};
    \draw(u1)
        to [european resistor, l={\rotatebox[origin=c]{90}{\qty{3,3}{\kilo\ohm}}}, -*] (o1);
    \draw(T.E)
        to [european resistor, l_={\rotatebox[origin=c]{90}{\qty{330}{\ohm}}}, -*] (T.E|-u1);
    \draw(T.E)
        to [short, *-] ++(1,0) coordinate(TEE)
        to [C, l={\rotatebox[origin=c]{90}{\qty{1}{\nano\farad}}}, -*] (TEE|-u1);
    \ctikzset{
        quadpoles/transformer core/inner=1,
        quadpoles/transformer core/width=0.6
    }    
    \draw(T.C)
        to [short, -*] ++(2.5,0) coordinate(o2)
        to [short] ++(0.5,0)
        node[transformer core, anchor=A2](F){};
    \draw(o2)
        to [vC, tunable end arrow={Bar}, invert] ++(0,-2.5) coordinate(f1)
        to [short,-*] (o2|-u1);
    \draw(F.B2)
        to [vC, tunable end arrow={Bar}, invert] (F.B2|-f1)
        to [short,-*] (F.B2|-u1);

    \draw(F.B1)
        to [short] ++(1,0) coordinate(h2)
        to [short, -*] (h2|-u1);
    % Help:
    \draw(F-L2.a) to [open, name={h3}] (F-L2.midtap);
    \draw(h3.center)
        to [short, *-o] (h3.center-|u4) coordinate(m4);
    \draw(F.A1)
        to [short, -*] ++(0,1) coordinate(g1)
        to [L, name={l1}] ++(2.5,0) coordinate(h4)
        to [short, -o] (h4-|u4)
        node[anchor=south](){+};
    \draw(g1)
        to [C, l={\qty{1}{\nano\farad}}] ++(-2,0)
        node[rground](){};
    \draw[dashed](l1.core west) -- (l1.core east);
    \draw(m4)
        to[open, name={h5}] (u4);
    \draw(h1.center)
        node[rotate=90](){\qty{96}{\mega\hertz}};
    \draw(h5.center)
        node[rotate=90](){\qty{288}{\mega\hertz}};
\end{circuitikz}