* source INTEGRATEUR
C_C1         N22791 N22759  10n  
R_R1         N22753 N22759  10k  
X_U20         0 N22759 N23259 N22837 N22791 LM741
V_V1         N22753 0  
+PULSE 1.8m 0 0 0 0 0.5ms 1ms
V_V3         N23259 0 12Vdc
V_V4         0 N22837 12Vdc