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I'm having trouble making a 3-way node using relative coordinates. Op-amps have fractional coordinates and I find it is easier to connect to using relative coordinates, but this diagram has a disconnect where R1 isn't connecting to the node I labelled.

enter image description here

This is my LaTeX code:

\begin{center}
\begin{circuitikz}[american voltages]
\draw 
    (0, 0) node[ op amp, noinv input up ] (opamp) {$A_v$}
    (opamp.+) to[ short, -*, l=$V_{in}$ ] (-2, 0.5)

(opamp.out)
to[ short, -*, l=$V_{out}$ ] ++(1, 0)

(opamp.-)
to [ short, -*, name=moo ] ++(0, -2)
to [ R, l=$R_2$, v=$v_2$ ] ++(0, -2)
to node[ground]{} ++(0,-1)

(moo) to [ R, l=$R_1$ ] ++(3,0)
to [ short, -*] ++(0, 1.5)
;




\end{circuitikz}
\end{center}

Also I'm struggling to position the V1 label to the left of the terminal, or the Vout label to the right of its terminal.

Thanks in advance for any advice!

Richard Sand
  • 113

1 Answers1

4

enter image description here

\documentclass[a4paper]{article}
\usepackage[dvipsnames]{xcolor}
\usepackage[siunitx, RPvoltages]{circuitikz}

\ctikzset{amplifiers/fill=cyan!20, component text=center}
\begin{document}


\begin{circuitikz}[american voltages]
    \draw 
    (0,0)    node[left]{$v_i$} to[short, o-] ++(1,0)
    nodeop amp, noinv input up, anchor=+{\texttt{$A_v$}}
    (OA.-)  -- ++(0,-1) coordinate(FB) to[R=$R_1$, v=$v_2$]

    ++(0,-2) node[ground]{}
    (FB) to[R=$R_2$, *-] (FB -| OA.out) -- (OA.out)
    to [short, *-o] ++(1,0) node[right]{$v_o$}
    ;


\end{circuitikz}
\end{document}
js bibra
  • 21,280