.subckt schmitt0504 in out G
B1 G N002 I=V(sum) -V(G) >= 0.5 ? 1 : 0
R1 N002 G 1
C1 N002 G 47n
E1 N001 G in G 1
R2 sum N001 1
R3 out sum 1.2
E2 out G N002 G 1
.ends