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diff --git a/1691/CH4/EX4.1/Exmp4_1.sce b/1691/CH4/EX4.1/Exmp4_1.sce
new file mode 100755
index 000000000..5a359d07f
--- /dev/null
+++ b/1691/CH4/EX4.1/Exmp4_1.sce
@@ -0,0 +1,20 @@
+//Example 4.1

+clc

+gm=(1/26)*10^3

+format(6)

+disp(gm,"(i) g_m(in mA/V) = I_C / V_T =")

+rbe=200/(38.46)

+format(5)

+disp(rbe,"(ii) r_b''e(in k-ohm) = h_fe / g_m =")

+cc=((38.46*10^-3)/(500*10^6))*10^12

+format(6)

+disp(cc,"(iii) (C_e + C_C)(in pF) = g_m / 2*pi*f_T = g_m / omega_T =")

+cbe=76.92-3

+disp(cbe,"Therefore,  C_b''e(in pF) = C_e =")

+disp("(iv) We know that,")

+disp("f_T = h_fe*f_beta")

+disp("Therefore,  2*pi*f_T = h_fe*2*pi*f_beta")

+disp("omega_T = h_fe*omega_beta")

+ob=((500*10^6)/200)*10^-3

+format(5)

+disp(ob,"omega_beta(in rad/sec) = omega_T / h_fe =")

diff --git a/1691/CH4/EX4.10/e4_10.sce b/1691/CH4/EX4.10/e4_10.sce
new file mode 100755
index 000000000..b3a6fa332
--- /dev/null
+++ b/1691/CH4/EX4.10/e4_10.sce
@@ -0,0 +1,14 @@
+//example4.10

+clc

+disp("a) The 3dB frequency for circuit gain and voltage gain is given as,")

+disp("(f_H)=1/(2*pi*R_eq*C_eq)")

+r=(200*1000)/(200+1000)

+disp(r,"where R_eq(in ohm)=(R_s+r_bb'')parallel to r+b''e =")

+c=(100*10^-12)+((1+50)*3*10^-12)

+format(10)

+disp(c,"and  C_eq(in F)=(C_b''e)+(1+(g_m*R_L)*C_b''c)= ")

+f=1/((2*%pi*166.67*253*10^-12))

+disp(f,"f_H(in Hz)= ")

+disp("b)Voltage gain is given as,")

+a=(-50*1)

+disp(a,"A=(-g_m*R_L)=")

diff --git a/1691/CH4/EX4.12/e4_12.sce b/1691/CH4/EX4.12/e4_12.sce
new file mode 100755
index 000000000..9c109dd49
--- /dev/null
+++ b/1691/CH4/EX4.12/e4_12.sce
@@ -0,0 +1,13 @@
+//example4.12

+clc

+disp("f_H=1/(2*pi*R_eq*C_eq)")

+disp("and f_H''=2(f_H)")

+disp("1/(2*pi*R_eq*C_eq) = 2/(2*pi*R_eq*C_eq)")

+disp("R_eq'' = R_eq/2")

+disp("R_eq=(r_b''e)parallel to (r_bb''+R_s)")

+disp("= (r_b''e)=1000 ohm")

+disp("Therefore  R_eq'' =500 ohm")

+disp("Therefore  500=((r_b''e)*(r_bb''+R_s))/((r_b''e)+(r_bb'')+R_s)")

+disp(" = 1000(100+R_s)/(1000+100+R_s)")

+r=(4.5*10^5)/500

+disp(r,"R_s(in ohms)= ")

diff --git a/1691/CH4/EX4.16/Exmp4_16.sce b/1691/CH4/EX4.16/Exmp4_16.sce
new file mode 100755
index 000000000..1a1d6eee1
--- /dev/null
+++ b/1691/CH4/EX4.16/Exmp4_16.sce
@@ -0,0 +1,19 @@
+//Example 4.16

+clc

+disp("Hybrid-pi Equivalent is as shown in fig.4.29")

+disp("(i) Mid frequency voltage gain :")

+disp("V_o / V_s = -h_fe*R_L / R_s+h_ie")

+hie=(100+1000)*10^-3

+format(4)

+disp(hie,"h_ie(in k-ohm) = r_bb'' + r_b''e =")

+hfe=0.2*1000

+disp(hfe,"h_fe = g_m * r_b''e =")

+vo=-200/2

+disp(vo,"Therefore,  V_o / V_s =")

+fb=(1/(2*%pi*1000*(204*10^-12)))*10^-3

+format(7)

+disp(fb,"(ii) f_beta(in kHz) = 1 / 2*pi*r_b''e*(C_e+C_C) =")

+format(4)

+disp(fb,"f_beta(in kHz) = ")

+ft=(200*780)*10^-3

+disp(ft,"(iii) f_T(in kHz) = h_fe * f_beta =")

diff --git a/1691/CH4/EX4.17/Exmp4_17.sce b/1691/CH4/EX4.17/Exmp4_17.sce
new file mode 100755
index 000000000..094691f70
--- /dev/null
+++ b/1691/CH4/EX4.17/Exmp4_17.sce
@@ -0,0 +1,30 @@
+//Example 4.17

+clc

+disp("(i) We know that,")

+disp("  f_H = 1 / 2*pi*R_eq*C_eq")

+disp("where  R_eq = (R_s+r_bb'')*r_b''e / R_s+r_bb''+r_b''e")

+disp("and  C_eq = C_e + C_C*[1+g_m*R_L]")

+rbe=100/100

+format(2)

+disp(rbe,"  r_b''e(in k-ohm) = h_fo / g_m = ")

+disp("C_eq = C_e + C_C*[1+g_m*R_L] = C_e + C_C[1+100*10^-3*500]")

+disp("     = C_e + 51 pF")

+ce=((100*10^-3)/(2*%pi*(400*10^6)))*10^12

+format(6)

+disp(ce,"C_e(in pF) = g_m / 2*pi*f_T =")

+ceq=39.79+51

+disp(ceq,"Therefore,  C_eq(in pF) =")

+req=1/(2*%pi*5*90.79*10^-6)

+disp(req,"R_eq(in ohm) = 1 / 2*pi*f_H*C_eq =")

+disp("Therefore, 350.6 = (R_s+100)*1000 / R_s+1100")

+rs=(285.66*10^3)/649.4

+format(7)

+disp(rs,"Therefore,  R_s(in ohm) =")

+disp("(ii) The mid-band voltage gain V_o/V_s is given as")

+disp("  V_o/V_s = -h_fe*R_L / R_s+h_ie")

+hie=(100+1000)*10^-3

+format(4)

+disp(hie,"where  h_ie(in K) = r_bb'' + r_b''e =")

+vo=(-100*500)/(439.88+1100)

+format(6)

+disp(vo,"Therefore,  V_o/V_s =")

diff --git a/1691/CH4/EX4.2/Exmp4_2.sce b/1691/CH4/EX4.2/Exmp4_2.sce
new file mode 100755
index 000000000..8d3506d86
--- /dev/null
+++ b/1691/CH4/EX4.2/Exmp4_2.sce
@@ -0,0 +1,17 @@
+//Example 4.2

+clc

+ft=25*2

+format(3)

+disp(ft,"(i) f_T(in MHz) = |A_i|*f =")

+hfe=50000/200

+format(4)

+disp(hfe,"(ii) h_fe(in kHz) = f_T / f_beta =")

+disp("(iii) |A_i| = h_fe / sqrt(1+((f/f_beta)^2)) =")

+disp("At  f = 10 MHz")

+ai=250/sqrt(1+(((10*10^6)/(200*10^3))^2))

+format(2)

+disp(ai,"|A_i| =")

+disp("At  f = 100 MHz")

+ai=250/sqrt(1+(((100*10^6)/(200*10^3))^2))

+format(4)

+disp(ai,"|A_i| =")

diff --git a/1691/CH4/EX4.20/Exmp4_20.sce b/1691/CH4/EX4.20/Exmp4_20.sce
new file mode 100755
index 000000000..c8d49b9a8
--- /dev/null
+++ b/1691/CH4/EX4.20/Exmp4_20.sce
@@ -0,0 +1,25 @@
+//Example 4.20

+clc

+disp("Assume that the output time-constant is negligible as compared to the time consedtant. When this is the case")

+disp("A_vs = V_o/V_s = -g_m*R''_L*G''_s / G''_s+g_b''e+sC")

+gs=6.66*10^-3

+format(8)

+disp(gs,"where  G''_s = 1 / (R_s||R_b)+r_bb'' =")

+gbe=1/1000

+format(6)

+disp(gbe,"g_b''e = 1 / r_b''e =")

+rl=(0.5/1.5)*10^3

+format(7)

+disp(rl,"R''_L(in ohm) = R_L || R_C =")

+disp("  sC = admittance of C")

+c=100+(3*(1+(50*333.33*10^-3)))

+format(4)

+disp(c,"where  C = C_e + C_C*(1+g_m*R''_L) =")

+disp("At 10 kHz,")

+sc=2*%pi*10*153*10^-9

+format(8)

+disp(sc,"sC = 2*pi*f*C =")

+disp("Therefore, At 10kHz signal frequency")

+avs=(-50*333.33*6.66*10^-6)/((6.66*10^-3)+(10^-3)+(9.613*10^-6))

+format(6)

+disp(avs,"A_vs = V_o / V_s =")