* pstran: a high-gain feedback ring that defeats Newton
b1 n2 0 v = 0.9 - 0.89*tanh(200*(v(n1)-0.9))
b2 n3 0 v = 0.9 - 0.89*tanh(200*(v(n2)-0.9))
b3 n1 0 v = 0.9 - 0.89*tanh(200*(v(n3)-0.9))
r1 n1 0 1meg
.option pstran
.control
  op
  print v(n1) v(n2) v(n3)
.endc
.end