\documentclass[landscape]{article}<nowiki>
\usepackage[siunitx]{circuitikz}
\usepackage[margin=0in]{geometry}
\pagestyle{empty}
\begin{document}
\begin{circuitikz}[scale=1.4]\draw
  (0,0) to[C, l=10<\micro\farad>] (0,2) -- (0,3)
        to[R, l=2.2<\kilo\ohm>] (4,3) -- (4,2)
        to[L, l=12<\milli\henry>, i=$i_1$,v=b] (4,0) -- (0,0)
  (4,2) { to[D*, *-*, color=red] (2,0) }
  (0,2) to[R, l=1<\kilo\ohm>, *-] (2,2) 
        to[cV, i=1,v=$\SI{.3}{\kilo\ohm} i_1$] (4,2)
  (2,0) to[I, i=1<\milli\ampere>, -*] (2,2) 
;\begin{scope}[shift={(0,-4)}]\draw
  (0,0) node[ground] {}
        to[V=$e(t)$, *-*] (0,2) to[C=4<\nano\farad>] (2,2)
        to[R, l_=.25<\kilo\ohm>, *-*] (2,0)
  (2,2) to[R=1<\kilo\ohm>] (4,2)
        to[C, l_=2<\nano\farad>, *-*] (4,0)
  (5,0) to[I, i_=$a(t)$, -*] (5,2) -- (4,2)
  (0,0) -- (5,0)
  (0,2) -- (0,3) to[L, l=2<\milli\henry>] (5,3) -- (5,2)
 
 {[anchor=south east] (0,2) node {1} (2,2) node {2} (4,2) node {3}}
;\end{scope}
\begin{scope}[shift={(0,-8)}]\draw
  (0,0) node[anchor=east] {B}
        to[short, o-*] (1,0)
        to[R=20<\ohm>, *-*] (1,2)
        to[R=10<\ohm>, v=$v_x$] (3,2) -- (4,2)
        to[cI=$\frac{\SI{}{\siemens}}{5} v_x$, *-*] (4,0) -- (3,0)
        to[R=5<\ohm>, *-*] (3,2)
  (3,0) -- (1,0)
  (1,2) to[short, -o] (0,2) node[anchor=east]{A} 
;\end{scope}
\begin{scope}[shift={(7,3)}]\draw
	(0,0) node[transformer] (T) {}
	(T.B2) to[pD] ($(T.B2)+(2,0)$) -| (3.5, -1)
	(T.B1) to[pD] ($(T.B1)+(2,0)$)  -| (3.5, -1)
;\end{scope}
\begin{scope}[shift={(7,-2)}]\draw
	(5,.5) node [op amp] (opamp) {}
	(0,0) node [left] {$U_{we}$} to [R, l=$R_d$, o-*] (2,0)
	to [R, l=$R_d$, *-*] (opamp.+)
	to [C, l_=$C_{d2}$, *-] ($(opamp.+)+(0,-2)$) node [ground] {}
	(opamp.out) |- (3.5,2) to [C, l_=$C_{d1}$, *-] (2,2) to [short] (2,0)
	(opamp.-) -| (3.5,2)
	(opamp.out) to [short, *-o] (7,.5) node [right] {$U_{wy}$}
;\end{scope}
\begin{scope}[shift={(7,-8)}]\draw
  (0,2) to[I=1<\milli\ampere>] (2,2)
        to[R, l_=2<\kilo\ohm>, *-*] (0,0)
        to[R, l_=2<\kilo\ohm>] (2,0)
        to[V, v_=2<\volt>] (2,2)
        to[cspst, l=$t_0$] (4,2) -- (4,1.5)
        to [generic, i=$i_1$, v=$v_1$] (4,-.5) -- (4,-1.5)
  (0,2) -- (0,-1.5) to[V, v_=4<\volt>] (2,-1.5)
        to [R, l=1<\kilo\ohm>] (4,-1.5);

   \begin{scope}[xshift=6.5cm, yshift=.5cm]
    \draw [->] (-2,0) -- (2.5,0) node[anchor=west] {$v_1/\SI{}{\volt}$};
    \draw [->] (0,-2) -- (0,2) node[anchor=west] {$i_1/\SI{}{\milli\ampere}$} ;
    \draw (-1,0) node[anchor=north] {-2} (1,0) node[anchor=south] {2}
          (0,1) node[anchor=west] {4} (0,-1) node[anchor=east] {-4} 
          (2,0) node[anchor=north west] {4}
          (-1.5,0) node[anchor=south east] {-3};
    \draw [thick] (-2,-1) -- (-1,1) -- (1,-1) -- (2,0) -- (2.5,.5);
    \draw [dotted] (-1,1) -- (-1,0) (1,-1) -- (1,0) 
          (-1,1) -- (0,1) (1,-1) -- (0,-1);
   \end{scope}
   \end{scope}
\end{circuitikz}
\end{document}
</nowiki>