LaTeX circuit diagrams

Making circuit diagrams in LaTeX documents is easy with the circuitikz package.  The following image can be created using the code below.

\documentclass{article}
\usepackage[free-standing-units]{siunitx}
\usepackage[american]{circuitikz}
\usepackage{tikz}

\begin{document}

\begin{figure}[h!]
\centering
\begin{circuitikz} \draw
(0,0) to[V, l=$9V$](0,4)
(0,4) -- (4,4)
(4,4) to[R, l=$R>470\ohm$] (4,2)
(4,2) to[led, l=LED](4,0)
(4,0) -- (0,0)
;
\end{circuitikz}
\caption{Base circuit}\label{fig:circuit1}
\end{figure}

\end{document}


The manual with complete list of symbols can be downloaded from
 http://tug.org/texlive/devsrc/Master/texmf-dist/doc/latex/circuitikz/circuitikzmanual.pdf