I have some programs that might be helpful
Scmitt Trigger
VCC 7 0 DC 15V
VEE 0 4 DC 15V
RIN 1 2 2K
R1 6 3 30K
R2 3 0 1K
VIN 1 0 SIN(0 2 1KHZ)
X1 3 2 7 4 6 UA741
.LIB EVAL.LIB
.TRAN 0.001MS 3MS
.PLOT TRAN V(6)
.PROBE
.END
Astable multivibrator using IC 741
R1 2 6 5K
RF 6 3 10K
R2 3 0 10K
C1 2 0 0.1UF
VCC 7 0 DC 15V
VEE 0 4 DC 15V
X1 3 2 7 4 6 UA741
.LIB EVAL.LIB
.TRAN 50US 2MS
.PLOT TRAN V(6)
.PROBE
.END
Monostable Multivibrator using IC 741
VCC 7 0 DC 15V
VEE 0 4 DC 15V
VIN 11 0 DC 1 PULSE( 0 1V 0 1US 1US 0.625MS 1.25MS)
R1 8 3 30K
R2 3 0 10K
R3 9 0 1K
R4 6 8 15K
RF 2 8 19K
D1 3 9 DMOD
D2 2 0 DMOD
.MODEL DMOD D
C1 2 0 0.1UF
C2 11 9 0.1UF
XA1 3 2 7 4 6 UA741
.LIB EVAL.LIB
.TRAN 1US 5000US
.PLOT TRAN V(6)
.OP
.PROBE
.END
Low pass Filter second order active
VCC 7 0 DC 15V
VEE 0 4 DC 15V
VIN 1 0 AC 1V
R1 0 2 10K
R2 1 5 20K
R3 5 3 20K
RF 2 6 5.86K
C1 5 6 0.01UF
C2 3 0 0.01UF
XA 3 2 7 4 6 UA741
.LIB EVAL.LIB
.AC DEC 10 100HZ 1MEGHZ
.PLOT AC V(6)
.PROBE
.END
