% Author: Dr. Matthias Jung, DL9MJ
% Year: 2021
\begin{tikzpicture}
    \begin{axis}[%
        /pgf/number format/1000 sep={ },
        /pgf/number format/use comma,        
        axis lines=middle,
        axis line style={-Triangle},
        ytick={-1,0,1},
        every major tick/.append style={thick, black},
        yticklabels={-10~V,0,+10~V},
        grid=major,
        grid style={line width=.1pt, draw=gray!10},
        major grid style={line width=.2pt,draw=gray!50},
        xticklabel=\empty,
        xtick style={draw=none},
        xmin=0,
        xmax=4.2*pi,
        ymin=-1.3,
        ymax=1.7,
        xmajorgrids=false,
        xlabel style={at={(ticklabel* cs:1)},anchor=north east},
        ylabel style={at={(ticklabel* cs:1)},anchor=north west},
        ylabel={$U_\mathrm{A}$},
        xlabel={$t$},
        width=\linewidth*\getDarcImageFactor,
        height=2cm,
        scale only axis,
    ]
    \addplot[samples=500,domain=0:4.0*pi,smooth,black] { sin(deg(x))<-0.8 ? -5*sin(deg(x))-4 : 0}; 
\end{axis}
\end{tikzpicture}%