%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-6-3 on page 578.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{427.6677pt}

\StartShownPreambleCommands
\usepackage[box]{circ}
\usepackage{array}
\StopShownPreambleCommands
\begin{document}
\providecommand{\Lcs}[1]{\mbox{\normalfont\ttfamily\char'134#1}}
\setlength{\extrarowheight}{3mm}
\begin{tabular}{@{}cccccc@{}}
\raisebox{\depth}%
 {\begin{circuit}0 \oscillograph{n} : a b c d h \end{circuit}} &
%\bbdefNeT oscillograph  {oscillograph}
\raisebox{\depth}%
 {\begin{circuit}0 \G{n} : a b c d h \end{circuit}} &
%\bbdefNeT G     {generator}
\raisebox{\depth}%
 {\begin{circuit}0 \Gvar{n} : a b c d h \end{circuit}} &
%\bbdefNeT Gvar  {generator, variable}
\raisebox{\depth}%
 {\begin{circuit}0 \Impulse{n} : a b c d h \end{circuit}} &
%\bbdefNeT Impulse  {generator, pulses}
\raisebox{\depth}%
 {\begin{circuit}0 \Amp{n} : a b c d h \end{circuit}} &
%\bbdefNeT Amp   {amplifier}
\raisebox{\depth}%
 {\begin{circuit}0 \ACtoDC{n} : a b c d h \end{circuit}}
%\bbdefNeT ACtoDC  {AC to DC converter}
\\
\Lcs{oscillograph} & \Lcs{G} & \Lcs{Gvar} &
\Lcs{Impulse} & \Lcs{Amp} & \Lcs{ACtoDC} \\
oscillograph & \multicolumn{3}{c}{generators (fixed, variable, pulse)} & amplifier & AD convertor
\end{tabular}
\end{document}