% Author: Stephan Kregel, DG1HXJ
% Year: 2022
% 2-TC611B-4
\begin{circuitikz}
    \draw (0,0)	node[ocirc]{} 
    to [D-] ++(2,0) -- ++(0,-0.5) coordinate(c1) -- ++(0.5,0) 
    to node[ocirc]{} ++(0,0);
    \draw (c1) -- ++(0,-0.5) 
    to [D-, invert] ++(-2,0) 
    to node[ocirc]{} ++(0,0);
    \draw (c1) node[circ]{} ++(0,0);
\end{circuitikz}