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diff --git a/281/CH4/EX4.7/example4_7.sce b/281/CH4/EX4.7/example4_7.sce
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+++ b/281/CH4/EX4.7/example4_7.sce
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+disp('chapter 4 ex4.7')
+disp('given')
+disp('capacitor coupled non inverting amplifier design')
+disp("voltage gain=100")
+disp("Supply voltage=24v ")
+Av=100
+Vcc=24
+disp("Output amplitude=5V")
+Vo=5
+disp("lower cut off frequency for the circuit =75Hz")
+disp('Rl=5.6kohms')
+disp("Ibmax=500nA")
+Vbe=0.7 
+Ibmax=500*10^(-9)
+disp("I2>>Ibmax")
+I2=100*Ibmax
+disp(I2,"I2=")
+R1=(Vcc/2)/I2
+disp("R1= ")
+disp('ohms',R1)
+R2=(Vcc/2)/I2
+disp(R2,"R2=")
+disp("assume R1=220Kohms")
+disp("Vi=Vo/Av")
+Vi=Vo/Av
+disp(Vi,"Vi=")
+R1=220000
+disp("I4>>Ibmax")
+I4=100*Ibmax
+disp(I4,"I4=")
+R4=Vi/I4
+disp(R4,"R4=")
+disp("R3+R4=Vo/I4")
+R3=(Vo/I4)-R4
+disp(R3,"R3=")
+Rp=(R1*R2)/(R1+R2)
+disp(Rp,"Rp(R1||R2)=")
+f1=75
+disp("Xc1=Rp/10 at F1")
+disp("C1=1/(2*pi*f1*(Rp/10))")
+C1=1/(2*%pi*f1*(Rp/10))
+disp('farads',C1)
+Rl=5600
+disp("Xc2=Rl/10 at F1")
+disp("C2=1/(2*pi*f1*(Rl/10))")
+C2=1/(2*%pi*f1*(Rl/10))
+disp('farads',C2)
+disp("C1=1/(2*pi*f1*R4)")
+C3=1/(2*%pi*f1*R4)
+disp('farads',C3)
+disp("The circuit voltage should be normally between 9 to 18 volts")