initial commit / add all books

8 files changed, 191 insertions, 0 deletions

diff --git a/3041/CH8/EX8.1/Ex8_1.sce b/3041/CH8/EX8.1/Ex8_1.sce
new file mode 100755
index 000000000..e61eef580
--- /dev/null
+++ b/3041/CH8/EX8.1/Ex8_1.sce
@@ -0,0 +1,28 @@
+//Variable declaration
+C=0.1                      //capacitance(uF)
+R1=10                      //resistance(k ohms)
+R2=2.3                     //resistance(k ohms)
+Vcc=12.                    //supply voltage(V) 
+Rl=10**3.                  //resistance(k ohms)
+
+//Calculations
+//Part a
+f=1/(0.693*C*(R2+R1/2))    //frequency(Hz)
+
+//Part b
+D=(1+(R2/R1))/(1+2*(R2/R1))*100          //duty cycle
+ 
+//Part c
+//(i)
+T1=0.693*C*(R1+R2)                        //time period through R1(ms)
+T2=0.693*R2*C                             //time period through R2(ms)
+Pavg=(Vcc/Rl)**2*(T1/(T1+T2))             //average power dissipated during current sourcing(mW)
+
+//Part d
+Pavg1=(T2/(T1+T2))*(Vcc/Rl)**2           //average power dissipated during current sinking(mW)
+
+//Results
+printf (" %.2f kHz",f)
+printf ("duty cycle is %.2f %%",D)
+printf ("average power dissipated in current sourcing is %.3f mW",Pavg/1E-3)
+printf ("average power dissipated in current sinking is %.3f mW",Pavg1/1e-3)
diff --git a/3041/CH8/EX8.2/Ex8_2.sce b/3041/CH8/EX8.2/Ex8_2.sce
new file mode 100755
index 000000000..b83a262a7
--- /dev/null
+++ b/3041/CH8/EX8.2/Ex8_2.sce
@@ -0,0 +1,17 @@
+ 
+
+//Variable declaration
+t=1                               //time constant
+e=1.8                             //e=R1/R2 min=1.8
+e1=9.                              //e1=R1/R2 max=9
+
+//Calculations
+Betamin=1/(1+e)                 //current gain minimum
+Betamax=1/(1+e1)                //current gain maximum
+Tmax=2*t*log((1+Betamin)/(1-Betamin))          
+Tmin=2*t*log((1+Betamax)/(1-Betamax))                 
+fmin=1/Tmax                     //minimum freq(Hz)
+fmax=1/Tmin                     //maximum freq(k Hz)
+
+//Results
+printf ("fmin is %.f Hz and fmax is %.1f KHz",fmin/1E-3,fmax)
diff --git a/3041/CH8/EX8.3/Ex8_3.sce b/3041/CH8/EX8.3/Ex8_3.sce
new file mode 100755
index 000000000..ea76df64c
--- /dev/null
+++ b/3041/CH8/EX8.3/Ex8_3.sce
@@ -0,0 +1,23 @@
+
+
+//Variable declaration
+C=0.01                     //capacitance(uF)
+R2=15                      //resistance(k ohms)
+Va2=4                      //voltage(V)
+Vcc=15.                    //supply voltage(V)
+R1=33                      //resistance(k ohms)
+
+//Calculations
+Va1=0.67*Vcc               //voltage(V)
+Vamax=Va1+Va2              //Va maximum(V)
+Vamin=Va1-Va2              //Va minimum(V)
+T1max=C*(R1+R2)*(log((1-(Vamax/(2*Vcc)))/(1-(Vamax/Vcc))))   //time period(ms)
+T1min=C*(R1+R2)*(log((1-(Vamin/(2*Vcc)))/(1-(Vamin/Vcc))))   //time period(ms)
+T2=0.693*R2*C
+fmax=1/(T1min+T2)                    //maximum frequency(K Hz)
+fmin=1/(T1max+T2)                    //miniimum frequency(K Hz)
+
+//Results
+printf ("minimum freq is %.2f",fmin)
+printf ("maximum freq is %.2f",fmax)
+printf(" (solution given in the textbook is incorrect)");
diff --git a/3041/CH8/EX8.4/Ex8_4.sce b/3041/CH8/EX8.4/Ex8_4.sce
new file mode 100755
index 000000000..73bf3be05
--- /dev/null
+++ b/3041/CH8/EX8.4/Ex8_4.sce
@@ -0,0 +1,37 @@
+//Variable declaration
+Vi=25                         //input voltage(V) 
+Vsmax=30                      //supply voltage max(V)
+Vomin=12                   //output minimum voltage or load voltage(V)
+Vl=12
+R1=20                         //load voltage(V)
+Io=15.                        //output current(mA) 
+Iq=3.                         //quinscent current of regulator(mA)
+Vo=20.                        //output voltage(V)
+
+//Calculations
+//Part a
+//(i)
+Vimax=Vsmax                     //maximum permissible voltage(V)
+Ro=0                            //for Vomin=beta=0
+//(ii)
+Vomax=Vi-2
+betaVomax=Vomax-Vomin                   //output voltage(V)
+R2max=(R1*betaVomax)/(Vomax-betaVomax)  //R2max(k ohms)
+//(iii)
+R3=betaVomax/Io                         //R3(k ohms)
+
+//Part b
+Vt=(Iq*betaVomax)/Io                   //common terminal fall(V)
+Vomin1=Vl+Vt                           //voltage output minimum(V)
+
+//Part c
+betaVo=Vo-Vl                          //output voltage(V)
+beta=betaVo/Vo                        //current gain
+R2=(R1*betaVo)/(Vo-betaVo)            //R2(ohms)
+
+//Results
+printf ("a)i)max permissible supply voltage is %.1f V",Vimax)
+printf ("ii)output voltage range for Vi=25V is %.1f V to %.1f V and R2max is %.f k ohms",Vomin,Vomax,R2max)
+printf ("iii)R3 is %.2f kohms kohms",R3)
+printf ("b)Vomin is %.1f V",Vomin1)
+printf ("c)R2 is %.2f ohms and R3 is %.3f ohms",R2,R3)
diff --git a/3041/CH8/EX8.5/Ex8_5.sce b/3041/CH8/EX8.5/Ex8_5.sce
new file mode 100755
index 000000000..e6e610a56
--- /dev/null
+++ b/3041/CH8/EX8.5/Ex8_5.sce
@@ -0,0 +1,15 @@
+//Variable declaration
+A=.0025                     //voltage gain
+Vi=8                        //input voltage(V)
+R2=1.5                      //resistance 2(k ohms)
+R1=1                        //resistance 1(k ohms)
+Vl=5                        //load voltage(V)
+
+//Calculations
+beta=R2/(R1+R2)               //current gain
+Vo=Vl/(1-beta)                //output voltage(V)
+Vo1=(A*Vi)/(1+(A*beta)-beta)  //output voltage ripple if Vi=8Vp-p
+
+//Results
+printf ("Vo is %.1f V",Vo)
+printf ("expression of output voltage ripple %.2f Vp-p",Vo1)
diff --git a/3041/CH8/EX8.6/Ex8_6.sce b/3041/CH8/EX8.6/Ex8_6.sce
new file mode 100755
index 000000000..ee84fa5a5
--- /dev/null
+++ b/3041/CH8/EX8.6/Ex8_6.sce
@@ -0,0 +1,25 @@
+//Variable declaration
+Ro=7.5                               //output resistance(ohms)
+hfe=50                          
+Ve=20                                //voltage given to emitter(V)       
+Vbe=0.8                              //base to emitter voltage(V)
+Vc=15                                //collector voltage(V)
+P=12                                 //maximum power dissipation(W)
+Ib1=5                                //for minimum load current Il=0,Ib=5
+
+//Calculations
+Io=(Vc/Ro)*10**3                      //output current(A)
+Il=76                                 //load current(mA)
+Is=Il+5                               //supply current(mA)
+Ic=Io-Is                              //collector current(A)
+Ib=Ic/hfe                             //base current(mA)
+Ie=Ic-Ib                              //emitter current(mA)
+Pt=(Ve*Ie)-(Vc*Ic)                    //power dissipated in transistor(W) 
+Pl=(Ve-Vbe)*Is-Vc*Il                   //power dissipated in LR
+Vimax=(P+Vc*(Ic*10**-3))/(Ie*10**-3)  //input voltage maximum
+Iomin=hfe*Ib1                         //output current minimum(mA)
+
+//Results
+printf ("power dissipated in the transistor is %.2f W and in LR is %.3f W",Pt/1E+3,Pl/1E+3)
+printf ("maximum permissible input voltage is %.2f V",Vimax)
+printf ("minimum load current for load voltage to remain stabalized is %.1f mA",Iomin)
diff --git a/3041/CH8/EX8.7/Ex8_7.sce b/3041/CH8/EX8.7/Ex8_7.sce
new file mode 100755
index 000000000..8f4909ff8
--- /dev/null
+++ b/3041/CH8/EX8.7/Ex8_7.sce
@@ -0,0 +1,21 @@
+//Variable declaration
+VL=12            //load voltage(V)
+I=2.             //current at 12 V
+V=240            //dc source(V)
+d=17/50.         //duty cycle
+d1=0.6           //duty cycle
+eta1=0.8         //efficiency
+
+//Calculations
+P=VL*I                        //average load power(W)
+Isav=(1*d)/2                  //average supply current(A)
+Pav=V*Isav                    //average supply power(W)
+eta=(P/Pav)*100               //regulator efficiency
+Isav1=(1*d1)/2                //average supply current(A)
+Il=(eta1*V*Isav1)/Vdc         //load current(A)
+Po=Il*Vdc                     //power output(W)
+
+//Results
+printf ("regulator efficiency is %.1f %%",eta)
+printf ("average supply current is %.1f A",Il)
+printf ("power output is %.1f W",Po)
diff --git a/3041/CH8/EX8.8/Ex8_8.sce b/3041/CH8/EX8.8/Ex8_8.sce
new file mode 100755
index 000000000..fd98e077d
--- /dev/null
+++ b/3041/CH8/EX8.8/Ex8_8.sce
@@ -0,0 +1,25 @@
+//Variable declaration
+Vs=200                //dc source voltage(V)
+Il=5                  //current to load voltage(A)
+Vl=15                 //load voltage(V)
+eta=.85               //efficiency
+f=20                  //oscillator frequency(Hz)
+iSmax=2.6             //peak value of supply current(A)
+P=100                 //full load power supply(W)
+pdf=0.4               //pulse duty factor
+
+//Calculations
+Isav=(Vl*Il)/(Vs*eta)   //average peak supply current(A)
+iS=(2*Isav)/pdf         //supply current(A)
+T=1000/f                //oscillation time period(uS)
+tp=pdf*T                //transistor time(us)
+d=iS/tp                 //change in iS with respect to time(A/us)
+tp1=iSmax/d             //transistor time(us)
+pdf1=tp1/T              //pulse duty factor
+Isav1=(iSmax*pdf1)/2    //average peak supply current(A)
+eta1=(P*100)/(Vs*Isav1) //efficiency
+
+//Results
+printf ("peak value of supply current is %.3f A",Isav)
+printf ("pdf is %.3f ",pdf)
+printf ("overall efficienc is %.1f %%",eta1)