In [1]:

```
#Variable declaration
R1=240; #Adjusted resistance of R2 resistor of LM317 voltage regulator, in kilo ohm
R2=2.4; #Fixed value of R1 resistor of LM317 voltage regulator, in ohm
#Calculations
#Output voltage of LM317 voltage regulator IC = 1.25(R2/R1 +1)
Vout=1.25*((R2*1000)/R1 + 1); #Regulated d.c output voltage for the circuit in V
#Results
print("The regulated d.c output voltage = %.2fV"%Vout);
```

In [2]:

```
#Variable declaration
R=1.2; #Value of resistance of monostable multivibrator in kilo ohm
C=0.1; #Value of capacitance of monostable multivibrator in microfarad
#Calculations
T=1.1*(R*1000)*C; #Time for which the circuit is ON, in microseconds
#Results
print("Time for which the circuit is ON = %d microseconds."%T);
```

In [3]:

```
#Variable declaration
R1=3.0; #Resistance of R1 resistor of 555 timer circuit in kilo ohm
R2=2.7; #Resistance of R2 resistor of 555 timer circuit in kilo ohm
C=0.033; #Capacitance of the capacitor of 555 timer circuit in microfarad
#Calculations
f=1.44/(((R1*1000) + 2*(R2*1000))*(C*pow(10,-6))); #Frequency of the circuit in Hz
f=f/1000; #Frequency of the circuit in kHz
#Results
print("The frequency of the circuit = %.2fkHz"%f);
```