% Author: Dr. Matthias Jung, DL9MJ
% Year: 2020
\begin{circuitikz}[european]
    \draw(0,0) coordinate(u0)
        to [short, o-*] ++(2,0) coordinate(u1)
        to [short,  -o] ++(4,0) coordinate(u4)
        node [anchor=west](){--};
    \draw(u0)
        to [open] ++(0,3) coordinate(m0)
        to [C, o-*] ++(2,0) coordinate(m1)
        to [short] ++(1,0)
        node[npn, tr circle, anchor=B](T){};
    \draw(T.E)
        to [R, -*] (T.E|-u4)
        node[rground](){};
    \draw(T.C)
        to [C,*-o] (T.C-|u4) coordinate(m4);
    \draw(T.E)
        to [short, *-] ++(1,0) coordinate(h1)
        to [C,-*] (h1|-u4) coordinate(u4);
    \draw(u4)
        to [open, name={h2}] (m4);
    \draw(m1)
        to [R, l={$R_2$}] (u1);
    \draw(m1)
        to [R, -*, l_={$R_1$}] ++(0,3) coordinate(o1)
        to [short] (o1-|T.C) coordinate(o2)
        to [R] (T.C);
    \draw(o1)
        to [short] ++(-1,0)
        to [C] ++(0,-1)
        node[rground](){};
    \draw(o2)
        to [short, *-o] (o2 -| u4)
        node[anchor=west](){+};
    \draw (m0) node[anchor=south]{E};
    \draw (m4) node[anchor=south]{A};
\end{circuitikz}