How can I center my circuit?

Question

documentclass[11pt,letterpaper]{article}

usepackage[latin1]{inputenc}
usepackage{graphicx}
usepackage{geometry}[top=2cm,bottom=2cm,hmargin=2.5cm]
usepackage[american]{circuitikz}

begin{document}

begin{figure}centering

begin {circuitikz} [scale = 0.7] [american][H]
draw

(0,0) node[op amp] (opamp1) {}

(6,-0.7) node[op amp] (opamp2) {}

(opamp1.-) to [short,-] ++ (-2,0)

to [R, l_=$1K$] ++(-5,0) node[left]{$V_1$}

to [V, l_=$3;V$] ++(0,-3)

to node[ground]{} ++(0,0)

(-6.5,-4) to node[ground]{} ++(0,0)

to [V, v=$6;V$, invert] ++(0,3)

to [R, l_=$1K$] ++(3,0)

to [short,-*] ++(0,1.7)

to [short,-] ++(0,3)

to [R, l_=$1K$] ++ (3,0)

to[short,-] ++(0,0) coordinate (leftC)

to (leftC -| opamp1.out)

to[short,-*] (opamp1.out)

(opamp1.+) to [short,-] ++ (-1,0)

to node[ground]{} ++(0,-1)

(opamp1.out) [short,-] ++(0,0)

to [R, l_=$1K$] ++ (2,0)

coordinate (leftC)

to (leftC -| opamp2.-)

to[short,-] (opamp2.-)

(opamp2.-) to [short, *-] ++(0,3)

to [short, -] ++(2,0)

to [R, l_=$2K Omega$] ++(3,0)

to [short, -] ++(0,-3.7)

coordinate (leftC)

to (leftC -| opamp2.out)

to[short,-] (opamp2.out)

(opamp2.up) to [short, -]  ++(0,5)

to [short, -] ++(8,0)

to [V,l_=$15v$] ++(0,-4)

to[short,-] ++(0,0) coordinate (leftC)

to (leftC -| opamp2.down)

to[short,-] (opamp2.down)

(opamp1.up) to [short, -]  ++(0,4.3)

to [short, -] ++(6,0)

(opamp1.down) to [short, -]  ++(0,-2.15)

to [short, -] ++(6,0)

(opamp2.+) -| ++(0,-0.4) node[ground]{}

(opamp2.out) to [short, -o] ++(3,0) node[right]{$V_o$}

(13.9,0)[short,*-] ++(0,1) to node[ground]{} ++(2,0)

;

end{circuitikz}

end{figure}

end{document}

Zarko · Answer

I would redraw your circuit scheme as follows:

documentclass[11pt]{article}
usepackage[letterpaper, 
            vmargin=2cm, hmargin=2.5cm]{geometry}
usepackage[american,siunitx]{circuitikz}

%---------------- show page layout. don't use in a real document!
usepackage{showframe}
renewcommandShowFrameLinethickness{0.15pt}
renewcommand*ShowFrameColor{color{red}}
%---------------------------------------------------------------%

begin{document}
    begin{figure}
    centering
    ctikzset{bipoles/length=1cm, nodes width=0.08}
begin{circuitikz}
node[op amp] (oa1) {};
draw   (oa1.out)   to [R=1<kiloohm>,*-*] ++ (2,0)
                    node[op amp,anchor=-] (oa2) {}
        (oa1.-)     -- ++ (-1,0)                coordinate (aux1)   
                    --  ++ (0,1)                coordinate (aux2)
                    to [R=1<kiloohm>] ++ (2,0) 
                    --  (aux2 -| oa1.out) -- (oa1.out)
        (oa1.+)     -- ++ (0,-0.5) node[ground] {}
%
        (aux1)      to [R=1<kiloohm>,*-] ++(-3.5,0) node[left] {$V_1$}
                    to [V_=3<volt>] ++ (0,-1.5)
                    node[ground] {}
        (aux1)      -- ++ (0,-1)
                    to [R=1<kiloohm>] ++(-2,0) node[left] {$V_1$}
                    to [V_=6<volt>] ++ (0,-1.5)
                    node[ground] {}
%%
        (oa2.out)   to [short,  -*] ++ (1,0)    coordinate (aux3)
        (oa2.-)     |-  ++ (1,1)                coordinate (aux4)
                    to [R=2<kiloohm>]  (aux4 -| aux3) -- (aux3)
                    to [short, -o] ++ (1,0) node[right] {$V_o$}
        (oa2.+)     -- ++ (0,-0.5) node[ground] {}
%%% suply
        (oa1.up)    |- ($(oa2.up)+(0,2)$)       
                    -- ++ (4,0)                 coordinate (aux5)
        (oa2.up)    -- (oa2.up |- aux5)
        (aux5)      to [V_=15<volt>,-*]    (aux5 |- oa2.out)
        (oa1.down)  |- ($(oa2.down)-(0,2)$)
                    -- ++ (4,0)                 coordinate (aux6)
        (aux5 |- oa2.out)   to [V_=-15<volt>]    (aux6)
        (aux5 |- oa2.out)   -| ++ (1,-0.5) node[ground] {}
    ;
end{circuitikz}
    end{figure}
end{document}

which after compilation gives:

(red lines mark text width)

In above MWE are in comparison to yours changed:

size of bipoles are reduced
used is siunitx notation for units
all circuits elements are positioned relative to neighbors one and slightly reduced
image scaling is omitted
also is omitted unknown circuitikz option H

Edit: Corrected is scheme. Now is as OP provide it in question.

js bibra · Answer

Remove centering and add the following line for hspace  -- rest no change -- your figure will always extend into margins being large

begin{figure}
hspace{-2cm}
........
end{figure}

How can I center my circuit?

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