* source ECE351 HW8P4
R_R1         N03959 VOUT 10k 
R_R2         N03959 0 10k 
X_U1         N03959 VIN VCC VEE N04077 uA741
V_V2         VCC 0  DC 15
V_V4         VIN 0 
+SIN 0 5 1 0 0 0
R_R3         N04077 VOUT 1k 
V_V3         0 VEE  DC 15
D_D2         0 VOUT MUR420