\usepackage{tikz}
\usetikzlibrary{positioning, shapes, arrows}
\usepackage[siunitx]{circuitikz}
\usepackage[utf8]{inputenc}
%\usepackage{cm}
\usepackage[T1]{fontenc}
\renewcommand*\familydefault{\sfdefault}

\usepackage{sectsty}
\allsectionsfont{ \sffamily}

