尝试制作有问题的电路

Question

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{circuitikz}
\usetikzlibrary{shapes.geometric, arrows}

 \begin{document}

 \begin{tikzpicture}
        \draw (0,0) node[ground]{} to[R=$R_B$] ++(0,2) coordinate(a)
        -- ++(0,1) node[op amp, anchor=+](A){}
        (a) to[R=$R_A$, *-] (a-|A.out) -- (A.out);
    \end{tikzpicture}
\end{document}

我尝试这样做，但我遇到了问题，抱歉我的英语不好，有人能帮忙吗

Answer 1

来源--https://tex.stackexchange.com/a/592731/38080

盒子里的电路

\documentclass{article}
\usepackage{graphicx}
\usepackage[export]{adjustbox}
\usepackage[RPvoltages]{circuitikz}

\newsavebox{\mycirc}
\sbox{\mycirc}{% no stray spaces
    \begin{tikzpicture}
        \draw (0,0) node[ground]{} to[R=$R_B$] ++(0,2) coordinate(a)
        -- ++(0,1) node[op amp, anchor=-, yscale=-1](A){}
        (a) to[R=$R_A$, *-] (a-|A.out) -- (A.out);
        \draw(A.out)to[short, -o,]++(1,0)node[above]{$V_{out}$}; 
        \draw(A.+)to[short, -o,]++(-1,0)node[above]{$V_{in}$};
        \end{tikzpicture}% no stray spaces
}

\begin{document}
    
    
    \begin{tikzpicture}[]
        \node [draw, text width=3cm, align=center]{% no stray spaces
            \adjustbox{width=3cm, height=3cm, keepaspectratio}{\usebox{\mycirc}}%
        };
    \end{tikzpicture}
\end{document}

独立使用

    \documentclass{article}
\usepackage{graphicx}
\usepackage[export]{adjustbox}
\usepackage[RPvoltages]{circuitikz}

\begin{document}
    
    
\begin{tikzpicture}
    \draw (0,0) node[ground]{} to[R=$R_B$] ++(0,2) coordinate(a)
    -- ++(0,1) node[op amp, anchor=-, yscale=-1](A){}
    (a) to[R=$R_A$, *-] (a-|A.out) -- (A.out);
    \draw(A.out)to[short, -o,]++(1,0)node[above]{$V_{out}$}; 
    \draw(A.+)to[short, -o,]++(-1,0)node[above]{$V_{in}$};
\end{tikzpicture}
\end{document}

编辑 Bill Nace 查询

  \documentclass{article}
\usepackage{graphicx}
\usepackage[export]{adjustbox}
\usepackage[RPvoltages]{circuitikz}
\usetikzlibrary{arrows.meta}
\begin{document}
    
    
    \begin{tikzpicture}
        \draw (0,0) node[ground]{} to[R=$R_B$] ++(0,2) coordinate(a)
        -- ++(0,1) node[op amp, anchor=-, yscale=-1](A){}
        (a) to[R=$R_A$, *-] (a-|A.out)coordinate[label={}](b) ;
        \draw(A.out)coordinate[ label=](c)to[short, -o,]++(1,0)node[above]{$V_{out}$}; 
        \draw(A.+)to[short, -o,]++(-1,0)node[above]{$V_{in}$};
        \draw[<-, red, in=180, out=-45](b) to ++(2,-2)node[right](){\scriptsize (a) {\texttt {-|}}  (A.out)};
        \draw[circle,fill= green](c)circle(1pt);
        \draw[circle,fill= red](b)circle(1pt);
        \draw [<-, green, in=180, out=-45](c) to ++(2,-2)node[right](){\scriptsize (A.out)};
    \end{tikzpicture}
\end{document}