\begin{circuit}0

\at 0 0 \P1
\- 1 d
\nl \spring1 {$R_1$} d
\- 1 d
\.1 
\- 1 d
\nl\cc \U1 {$v_1$} - d
\- 1 d \P2

\atpin P1
\- 5 r \P3
\- 1 d
\nl \spring2 {$R_2$} d
\- 1 d
\.2 
\- 1 d
\nl\cc \U2 {$v_2$} - d
\- 1 d \P4

\atpin .1 \shift -1.5 0 \put{$A$}
\atpin .2 \shift -1.5 0 \put{$B$}

\atpin P3
\- 2 r \P5
\_ 13 d \P6
\htopin P2

\atpin P5
\nl \connection1 {} c r

\atpin P6
\nl \connection2 {} c r

\atpin P1 \shift 0.5 -1.8
\put{$+$}

\atpin .1 \shift 0.5 0.8
\put{$-$}

\atpin .1 \shift 0.5 -1.8
\put{$+$}

\atpin P2 \shift 0.5 0.8
\put{$-$}


\atpin P3 \shift 0.5 -1.8
\put{$+$}

\atpin .2 \shift 0.5 0.8
\put{$-$}

\atpin .2 \shift 0.5 -1.8
\put{$+$}


\atpin P4 \shift 0.5 0.8
\put{$-$}


\end{circuit}