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\documentclass[a4paper]{scrreprt}

% einbinden der pgfplot-Graphen
\usepackage{tikz}
\usepackage[european]{circuitikz}
\ctikzset {	voltage/distance from node=0.6,
			voltage/bump b=2,
			voltage/european label distance = 1.7}

\begin{document}
\begin{circuitikz}
	\draw
	% DC L
	(4,3) to [L, l=$L_{DC}$, v_<=$U_{DC}$, -o] (8,3)
	% HF C
	(0,3)  to [C, l=$C_{HF}$, v_>=$u_{HF}$, o-] (4,3)
	% LED
	(4,3) to [leDo, v_>=$u_{HF} + U_{DC}$, l=$LED$, *-] (4,0) node[ground]{}
	;
\end{circuitikz}
\end{document}

\begin{figure}[H]
\begin{circuitikz}
	\draw[color=black, thick]

	% modulation source	
	 (0,0) node[ground]{} to [V<=$\SI{2.8}{\volt} $] (0,2)
	 to [R, l_=$\SI{50}{\ohm}$, v^>=$\SI{2.3}{\volt}$] (0,4)
	 to [solid, -o] (2,4)
	
	% HF C
	node[above right]{$HF_{in}$} to [C, l=$\SI{0.5}{\ohm}$, v_>=$\SI{23.3}{\milli\volt}$, o-] (6,4)
	
	% DC L
	 to [L, l=$\SI{188}{\ohm}$, v_>=$\SI{442.9}{\milli\volt}$, -o] (10,4) node[above left]{$DC_{in}$}
	 
	 % current source (shortened)
	 to [solid, o-] (12,4)
	 to [R, l_=$\SI{0.1}{\ohm}$, v^>=$\SI{235.6}{\micro\volt}$] (12,2)
	 to [V=$\SI{0}{\volt}$] (12,0) node[ground]{}

	% LED
	(6,4) to [short, *-] (6,3)
	to [leDo, l=$\SI{10}{\ohm}$, v_>=$\SI{443.1}{\milli\volt}$] (6,0) node[ground]{}
	;
	
	\draw [densely dashed]
	% box around HF source
	(-2,-1) to +(4,0)
	to +(4,6)
	to node [above,pos=0.5] {HF source} +(0,6) %Beschriftung
	to +(0,0)
	;
	
	\draw [densely dashed]
	% box around DC source
	(10,-1) to +(4,0)
	to +(4,6)
	to node [above,pos=0.5] {DC source} +(0,6) %Beschriftung
	to +(0,0)
	;
\end{circuitikz}

\end{figure}