% Author: Dr. Matthias Jung, DL9MJ
% Year: 2021
\begin{circuitikz}
    \draw(0,0)
        node[anchor=east](){\qty{0}{\volt}}
        to [short, o-] ++(3,0) coordinate(dc0)
        to [short, -o] ++(1.5,0);
    \draw(0,3)
        node[anchor=east](){+\qty{12}{\volt}}
        to [R, o-] ++(3,0) coordinate(dc1)
        to [short, -o] ++(1.5,0)
        node[anchor=west](){+\qty{4,7}{\volt}};
    \draw(dc0) 
        to [stroke Zener diode, mirror, *-*] (dc1);
\end{circuitikz}