%!tikz editor 1.0
\documentclass{article}
\usepackage{pgf,tikz,pgfplots}

\usepackage{tkz-euclide}

\usetikzlibrary{angles, arrows.meta, quotes, calc, babel, fadings,quotes}

\usetikzlibrary{intersections,through,backgrounds}


\usepackage[graphics, active, tightpage]{preview}
\PreviewEnvironment{tikzpicture}

%!tikz preamble begin

%!tikz preamble begin
\usepackage{circuitikz}
%!tikz preamble end


\begin{document}
%!tikz source begin
\begin{tikzpicture}
% Circuit style
\ctikzset{
    logic ports=ieee,
    logic ports/scale=0.8,
%    logic ports/fill=lightgray
}

\node[nand port] (Nand) at (0,-2){};


\draw (Nand.in 1) -- ++(-0,0) node[near end,above]{a};
\draw (Nand.in 2) -- ++(-0,0) node[near end,below]{b};
\draw[thick] (Nand.in 2) --  (Nand.in 1)node[midway](in){};
\draw (in.center) -- ++(-0.75,0) node[left]{in};
\draw (Nand.out) -- ++(0.25,0) node[right]{out};
%\draw (Not.in 1) -| (Not.in 2);

\end{tikzpicture}
%!tikz source end

\end{document}