%!tikz editor 1.0
\documentclass{article}
\usepackage{tikz}
\usepackage[graphics, active, tightpage]{preview}
\usepackage{circuitikz}
\PreviewEnvironment{tikzpicture}

%!tikz preamble begin
\usetikzlibrary{circuits.logic.IEC, positioning}
\usepackage[utf8]{inputenc}


\makeatletter
\def\grd@save@target#1{%
  \def\grd@target{#1}}
\def\grd@save@start#1{%
  \def\grd@start{#1}}
\tikzset{
  grid with coordinates/.style={
    to path={%
      \pgfextra{%
        \edef\grd@@target{(\tikztotarget)}%
        \tikz@scan@one@point\grd@save@target\grd@@target\relax
        \edef\grd@@start{(\tikztostart)}%
        \tikz@scan@one@point\grd@save@start\grd@@start\relax
        \draw[minor help lines] (\tikztostart) grid (\tikztotarget);
        \draw[major help lines] (\tikztostart) grid (\tikztotarget);
        \grd@start
        \pgfmathsetmacro{\grd@xa}{\the\pgf@x/1cm}
        \pgfmathsetmacro{\grd@ya}{\the\pgf@y/1cm}
        \grd@target
        \pgfmathsetmacro{\grd@xb}{\the\pgf@x/1cm}
        \pgfmathsetmacro{\grd@yb}{\the\pgf@y/1cm}
        \pgfmathsetmacro{\grd@xc}{\grd@xa + \pgfkeysvalueof{/tikz/grid with coordinates/major step}}
        \pgfmathsetmacro{\grd@yc}{\grd@ya + \pgfkeysvalueof{/tikz/grid with coordinates/major step}}
        \foreach \x in {\grd@xa,\grd@xc,...,\grd@xb}
        \node[anchor=north] at (\x,\grd@ya) {\pgfmathprintnumber{\x}};
        \foreach \y in {\grd@ya,\grd@yc,...,\grd@yb}
        \node[anchor=east] at (\grd@xa,\y) {\pgfmathprintnumber{\y}};
      }
    }
  },
  minor help lines/.style={
    help lines,
    step=\pgfkeysvalueof{/tikz/grid with coordinates/minor step}
  },
  major help lines/.style={
    help lines,
    line width=\pgfkeysvalueof{/tikz/grid with coordinates/major line width},
    step=\pgfkeysvalueof{/tikz/grid with coordinates/major step}
  },
  grid with coordinates/.cd,
  minor step/.initial=.2,
  major step/.initial=1,
  major line width/.initial=1pt,
}
\makeatother
%!tikz preamble end


\begin{document}
%!tikz source begin
\begin{tikzpicture}[scale=1.3, transform shape,circuit logic IEC]

\tikzstyle{branch}=[fill,shape=circle,minimum size=3pt,inner sep=0pt]

 	%\draw (0,0) to[grid with coordinates] (10,5);

	% Koordinaten für Kreuzpunkte
	\coordinate (A) at (0.95,2.75);
	\fill (A) circle (1pt);
	\coordinate (B) at (0.95,0.5);
	\fill (B) circle (1pt);

	\coordinate (C) at (0.55,2.75);
	\fill (C) circle (1pt);
	
	\coordinate (D) at (2.5,1.4);
	
	\coordinate (E) at (0.75,0.5);
	\fill (E) circle (1pt);
	
	\coordinate (F) at (2.5,1.8);
	
	% Eingangsvariablen
	\node (x2) at (0.2,0.5) {b};
	\node (x1) at (0.2,2.75) {a};
		
	% Ausgangsvariable
	\node (y) at (5,0.5) {out};
	
	% Gatter
	\node[nand gate] at (1.5,0.5) (n1) {};
	\node[nand gate] at (1.5,2.75) (n2) {};
	\node[nand gate] at (3.45,2.58) (n4) {};
	\node[nand gate] at (3.45,0.666) (n3) {};
	\node[nand gate] at (5,1.6) (n5) {};	
	
	% Verbindungen
	
	\draw(x1) --  (A);
	\draw(x2) --  (B);	
	\draw(A) |- (n2.input 1);
	\draw(A) |- (n2.input 2);
	\draw(B) |- (n1.input 1);
	\draw(B) |- (n1.input 2);
	\draw(n1.output) -- (n3.input 2);
	\draw(n2.output) -- (n4.input 1);
	\draw(C) |- (D);
	\draw(D) |- (n3.input 1);
	\draw(E) |- (F);
	\draw(F) |-	(n4.input 2);
	\draw(n4.output) --	(n5.input 1);
%	\draw(n1.output) --  (A);	
%	\draw(A) |- (n2.input 2);
%	\draw(A) |- (n2.input 1);
%	\draw(n2.output) -- (y);
%   \draw(n1.output) to [short,l=\footnotesize{nandout}, -] (A);
   
\end{tikzpicture}
%!tikz source end

\end{document}