\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}