% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2023
\begin{circuitikz}[american]
    \ctikzset{
        transformer L1/.style={inductors/width=1.5, inductors/coils=6},
        transformer L2/.style={inductors/width=1.5, inductors/coils=6},
        quadpoles/transformer core/height=2,
    	capacitors/scale=\getDarcImageFactor,
        diodes/scale=\getDarcImageFactor,
    	inductors/scale=\getDarcImageFactor
	}
    \draw(0,0) coordinate(start)
        to [short, o-*] ++(2.0,0)
        node [transformer core, anchor=A1](T1){};

    \draw(T1.A1)
        to [vC,-*,invert, mirror] (T1.A2)
        to [short,-o] ++(0,-1)
        node [anchor=north](){+};

    \draw(T1.B1) 
        to [stroke diode] ++(2,0)
        node [transformer core, anchor=A1](T2){};
    \draw(T1.B2)     to [stroke diode, name={D}]   (T2.A2);
    \draw(T1.B1)     to [open, name={h1}]          (T2.A2);
    \draw(T1.B1)     to [stroke diode, invert, *-] (h1.center);
    \draw(h1.center) to [short, -*]                (T2.A2);
    \draw(T1.B2)     to [open, name={h2}]          (T2.A1);
    \draw(T1.B2)     to [stroke diode, invert, *-] (h2.center);
    \draw(h2.center) to [short, -*]                (T2.A1);

    \draw(T1-L2.midtap)
        to [short, *-] ++(0.25,0)
        to [short] ++(0,-2.25) coordinate(h3)
        to [short, -*] (h3-|D) coordinate(h4)
        -| (T2.B2);
    
    \draw(h4)
        to [short] ++(0,-1) coordinate(h6)
        to [C, *-*] ++(1.25,0) coordinate(h5)
        |- (T2-L1.midtap) 
        to [short, -*] ++(0,0);

    \draw(T2.B1)
        to [short, -o] ++(1.0,0) coordinate(end1);

    \draw(h5)
        to [short,-o] (h5-|end1) coordinate(end2);

    \draw(h6)
        to [short] ++(0,-0.5)
        node[rground](){};

    \draw(start) node[anchor=north west](){ZF-Amp.};
    \draw(end1) node[anchor=north east](){BFO};
    \draw(end2) node[anchor=north east](){NF};
\end{circuitikz}