In [1]:

```
%matplotlib inline
```

In [2]:

```
#variable declaration
Del_V_out=0.25;
V_out=15;
Del_V_in=5; #All voltages in Volts
#Calculations
line_regulation=((Del_V_out/V_out)/Del_V_in)*100;
#Result
print('line regulation in %%V is %f' %line_regulation)
```

In [3]:

```
# Variable Declaration
V_NL=12.0; #No load output voltage in Volts
V_FL=11.9; #Full load output voltage in Volts
I_F=10.0; #Full load current in milli-Amperes
#Calculations
load_regulation=((V_NL-V_FL)/V_FL)*100;
load_reg=load_regulation/I_F;
#Result
print('load regulation as percentage change from no load to full load = %f'%load_regulation)
print('\nload regulation as percentage change per milliampere = %f' %load_reg)
```

In [4]:

```
V_REF=5.1 #Zener voltage in volts
R2=10*10**3;
R3=10*10**3; #resistances in ohm
V_out=(1+(R2/R3))*V_REF;
print('output voltage in volts = %.1f'%V_out)
```

In [5]:

```
R4=1; #Resistance in Ohms
I_L_max=0.7/R4;
print('maximum current provided to load(in amperes) = %.1f'%I_L_max)
```

In [6]:

```
V_IN=12.5; #maximum input voltage in volts
R1=22; #In Ohms
V_OUT=0;
V_R1=V_IN-V_OUT; #Voltage across R1
P_R1=(V_R1*V_R1)/R1; #maximum power dissipated by R1
print('maximum power dissipated by R1 in WATTS = %f'%P_R1)
```

In [7]:

```
print('SAME AS EX-2.8 in CHAPTER-2')
```

In [8]:

```
I_max=700*10**-3; #in Amperes
R_ext=0.7/I_max;
print('value of resistor in Ohms for which max current is 700mA = %f'%R_ext)
```

In [9]:

```
V_OUT=24.0; #Output voltage in Volts
R_L=10.0; #Load resistance in Ohms
V_IN=30.0; #Input voltage in Volts
I_max=700.0*10**-3; #maximum interal current in Amperes
I_L=V_OUT/R_L; #load current in amperes
I_ext=I_L-I_max; #current through the external pass transistor in Amperes
P_ext_Qext=I_ext*(V_IN-V_OUT); #power dissipated
print('power dissiated(in WATTS) by the external pass transistor = %.1f'%P_ext_Qext)
print('\nFor safety purpose, we choose a power transistor with rating more than this, say 15W')
```

In [10]:

```
V_out=5.0; #7805 gives output voltage of 5V
I_L=1.0; #constant current of 1A
R1=V_out/I_L;
print('The value of current-setting resistor in ohms = %d'%R1)
```