`Claudio, non hai letto bene il log dei tuo primo messaggio in cui alleghi il listato sia del sorgente, sia del log, che qui ripeto:
This is pdfTeX, Version 3.1415926-2.3-1.40.12 (Web2C 2011)
This is pdfTeX, Version 3.1415926-2.3-1.40.12 (Web2C 2011) (format=pdftex 2011.7.30) 4 OCT 2011 08:38
entering extended mode
Come puoi leggere il file di formato si chiama pdftex, non pdflatex, quindi hai semplicemente sbagliato a cliccare il bottone di compilazione; clicca il bottone corrispondente a pdflatex, oppure scegli il motore ci compilazione pdflatex (a seconda di come funziona il tuo shell editor); se ci sono altri errori, almeno non ci sarà quello di cercare di compilare un file LaTeX con un formato adatto a Plain TeX.
Happy TeXing!
Old Claudio
`
giusto
ho compilato questo
`\begin{pgfpicture}{0cm}{0cm}{170pt}{80pt}
% Created by FidoCadJ ver. 0.23.5, export filter by Davide Bucci
\pgfsetxvec{\pgfpoint{2pt}{0pt}}
\pgfsetyvec{\pgfpoint{0pt}{2pt}}
\pgfsetroundjoin
\pgfsetroundcap
\pgftranslateto{\pgfxy(0,40)}
\begin{pgfmagnify}{1}{-1}
% Layer color definitions
\definecolor{layer0}{rgb}{0.0,0.0,0.0}
\definecolor{layer1}{rgb}{0.0,0.0,0.5}
\definecolor{layer2}{rgb}{1.0,0.0,0.0}
\definecolor{layer3}{rgb}{0.0,0.5,0.5}
\definecolor{layer4}{rgb}{1.0,0.78,0.0}
\definecolor{layer5}{rgb}{1.0,0.78,0.0}
\definecolor{layer6}{rgb}{1.0,0.78,0.0}
\definecolor{layer7}{rgb}{1.0,0.78,0.0}
\definecolor{layer8}{rgb}{1.0,0.78,0.0}
\definecolor{layer9}{rgb}{1.0,0.78,0.0}
\definecolor{layer10}{rgb}{1.0,0.78,0.0}
\definecolor{layer11}{rgb}{1.0,0.78,0.0}
\definecolor{layer12}{rgb}{1.0,0.78,0.0}
\definecolor{layer13}{rgb}{1.0,0.78,0.0}
\definecolor{layer14}{rgb}{0.0,0.0,0.0}
\definecolor{layer15}{rgb}{0.0,0.0,0.0}
% End of color definitions
\color{layer0}
\pgfsetlinewidth{1.0pt}
\pgfline{\pgfxy(75,37)}{\pgfxy(75,40)}
\pgfline{\pgfxy(72,35)}{\pgfxy(77,32)}
\pgfline{\pgfxy(65,35)}{\pgfxy(72,35)}
\pgfline{\pgfxy(85,35)}{\pgfxy(77,35)}
\pgfmoveto{\pgfxy(68,30)}
\pgflineto{\pgfxy(82,30)}
\pgflineto{\pgfxy(82,37)}
\pgflineto{\pgfxy(68,37)}
\pgfclosepath
\pgfqstroke
\end{pgfmagnify}
\end{pgfpicture}`
ma non questo
`
% A simple fault tree
% Author: Zhang Long, Mail: zhangloong[at]gmail.com
%\def\pgfsysdriver{pgfsys-dvipdfm.def}
\documentclass{minimal}
\usepackage[latin1]{inputenc}
\usepackage{tikz}
\usetikzlibrary{trees,positioning,arrows}
\begin{document}
\begin{tikzpicture}
%% Draw system flow diagram
\begin{scope}[
xshift=-7.5cm,yshift=-5cm,very thick,
node distance=7.6cm,
on grid,
%>=stealth',
comp/.style={circle,draw,fill=orange!40}]
\node [comp] (cb) {Funzione logica};
\node [comp] (ca1) [above=of cb,xshift=-0.8cm] {Tavola di verità} edge [<->] (cb);
\node [comp] (ca2)
{Circuito} edge [<->] (cb);
\draw [<->] (ca1.east) — (ca2.west);
\end{scope}
\end{tikzpicture}
\end{document}
`
che ho dovuto modificare in questo
`
\usetikzlibrary{trees,positioning,arrows}
\begin{tikzpicture}
%% Draw system flow diagram
\begin{scope}[
xshift=-7.5cm,yshift=-5cm,very thick,
node distance=7.6cm,
on grid,
%>=stealth',
comp/.style={circle,draw,fill=orange!40}]
\node [comp] (cb) {Funzione logica};
\node [comp] (ca1) [above=of cb,xshift=-0.8cm] {Tavola di verità} edge [<->] (cb);
\node [comp] (ca2)
{Circuito} edge [<->] (cb);
\draw [<->] (ca1.east) — (ca2.west);
\end{scope}
\end{tikzpicture}
`
Grazie per l’aiuto