.PS
include(libcct.m4)
cct_init

# Usual defs...
qrt=dimen_/4;
hlf=dimen_/2;
dim=dimen_;

Op1:opamp(right_,,,4*dim,P)
line right_ hlf
line from Op1.In1 left_ hlf
move down_ dim 
ground(,T)
source(up_,AC); llabel(,v_1,)
line from Op1.In2 left_ hlf
move down_ dim
ground(,T)
source(up_,AC); llabel(,v_2,)
line from Op1.Out left_ 2*dim then up_ hlf then left_ 1.1*dim
move down_ 1.25*dim 
{right_; "(   " rjust_; "   )" ljust_}
ground(,T)
consource(up_,V)
rlabel(,v_3=A(v_2-v_1),)
line up_ qrt

"\tiny IdealOpAmp" at (3*dim, -1.5*dim) rjust_ 
.PE