\begin{tikzpicture}[scale=2.54]
% dpic version 2020.03.01 option -g for TikZ and PGF 1.01
\ifx\dpiclw\undefined\newdimen\dpiclw\fi
\global\def\dpicdraw{\draw[line width=\dpiclw]}
\global\def\dpicstop{;}
\dpiclw=0.8bp
\dpiclw=0.8bp
\dpicdraw (0,0)
 --(0.125,0)\dpicstop
\dpicdraw (0.625,0)
 --(0.125,0.25)
 --(0.125,-0.25)
 --(0.625,0)
 --(0.75,0)\dpicstop
\draw (0.777674,0) node[right=-2bp]{{\tt amp}};
\dpicdraw (0,-0.4)
 --(0.225,-0.4)\dpicstop
\dpicdraw (0.525,-0.4)
 --(0.225,-0.25)
 --(0.225,-0.55)
 --(0.525,-0.4)
 --(0.75,-0.4)\dpicstop
\draw (0.777674,-0.4) node[right=-2bp]{{\tt amp(,0.3)}};
\dpicdraw (2,0)
 --(2.229167,0)\dpicstop
\dpicdraw (2.345833,-0.175)
 --(2.229167,-0.175)
 --(2.229167,0.175)
 --(2.345833,0.175)\dpicstop
\dpicdraw (2.345833,0.175)
 ..controls (2.442483,0.175) and (2.520833,0.09665)
 ..(2.520833,0)
 ..controls (2.520833,-0.09665) and (2.442483,-0.175)
 ..(2.345833,-0.175)\dpicstop
\dpicdraw (2.520833,0)
 --(2.75,0)\dpicstop
\draw (2.777674,0) node[right=-2bp]{{\tt delay}};
\dpicdraw (2,-0.4)
 --(2.291667,-0.4)\dpicstop
\dpicdraw (2.358333,-0.5)
 --(2.291667,-0.5)
 --(2.291667,-0.3)
 --(2.358333,-0.3)\dpicstop
\dpicdraw (2.358333,-0.3)
 ..controls (2.413562,-0.3) and (2.458333,-0.344772)
 ..(2.458333,-0.4)
 ..controls (2.458333,-0.455228) and (2.413562,-0.5)
 ..(2.358333,-0.5)\dpicstop
\dpicdraw (2.458333,-0.4)
 --(2.75,-0.4)\dpicstop
\draw (2.777674,-0.4) node[right=-2bp]{{\tt delay(,0.2)}};
\dpicdraw (4.125,0.25)
 --(4,0.25)
 --(4,-0.25)
 --(4.125,-0.25)\dpicstop
\dpicdraw (4.625,0)
 --(4.125,0.25)
 --(4.125,-0.25)
 --(4.625,0)
 --(4.75,0)\dpicstop
\draw (4.777674,0) node[right=-2bp]{{\tt integrator}};
\dpicdraw (4.075,-0.35)
 --(4,-0.35)
 --(4,-0.65)
 --(4.075,-0.65)\dpicstop
\dpicdraw (4.375,-0.5)
 --(4.075,-0.35)
 --(4.075,-0.65)
 --(4.375,-0.5)
 --(4.75,-0.5)\dpicstop
\draw (4.777674,-0.5) node[right=-2bp]{{\tt integrator(,0.3)}};
\end{tikzpicture}
\vspace*{-0.5\baselineskip}
