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\begin{document}
  This is a collection of diagrams the author has had occasion to
  produce using m4 circuit macros and others, and gpic or dpic.  In
  many cases, there are other or better macro or pic constructs for
  producing the same drawings.
  \begin{figure}[h]\begin{center} 
   \input ex1
   \ \box\graph
   \caption{A simple labeled circuit.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex10
  \ \box\graph
  \caption{Bipolar transistor circuit.}\end{center}\end{figure}

  \vspace{1ex}
  \begin{figure}[h]\begin{center}
   \input ex12
  \ \box\graph
  \caption{CMOS NAND gate.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex11
  \ \box\graph
  \caption{Transistor radio audio chain.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex2
  \ \box\graph
   \input ex13
  \ \box\graph
  \caption{Elements at obtuse angles.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex4
  \ \box\graph
  \caption{Labels on non-manhattan elements.}\end{center}\end{figure}
  \clearpage

  \begin{figure}[h]\begin{center}
   \input ex3.5
  \ \box\graph
  \caption{Precision half-wave rectifier.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex1.1
  \ \box\graph
  \caption{Repetitive network created by Pic looping.}\end{center}\end{figure}
  \clearpage

  \begin{figure}
   \hspace*{-0.75in}\rotate{\vbox{%
   \epsffile{cct.eps}\caption{A digital circuit of moderate size,
   redrawn from
   M. P. Maclenan and G. M. Burns, ``An Approach to Drawing
          Circuit Diagrams for Text Books,'' Tugboat (12)1,
          March 1991, pp. 66-69.
   }}}
  \ \box\graph
  \end{figure}

  \begin{figure}[h]\begin{center}
   \input ex3
  \ \box\graph
  \caption{Digital filter.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex8
  \ \box\graph
  \caption{A logic circuit.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex5
  \ \box\graph
  \caption{Some {\tt darrow\/} constructs.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex6
  \ \box\graph
  \caption{Crosshatching by {\tt for\/} loops.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input flow
  \ \box\graph
  \caption{A flow diagram}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex0
  \ \box\graph
  \caption{Magnetic-field.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex7
  \ \box\graph
  \caption{A line diagram.}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input exp
  \ \box\graph
  \caption{Test of {\tt project\/} macros.}\end{center}\end{figure}

   \input csc

  \begin{figure}[h]\begin{center}
   \input ex9
  \ \box\graph
  \caption{Illustrating {\tt dimension\_\/}}\end{center}\end{figure}

  \begin{figure}[h]\begin{center}
   \input ex15
  \ \box\graph
  \caption{A simple diagram which is easily drawn by looping }
   \end{center}\end{figure}

\end{document}