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diff --git a/281/CH11/EX11.1/example11_1.sce b/281/CH11/EX11.1/example11_1.sce
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+disp('chapter 11 ex11.1')
+disp('given')
+disp('design an all-pass circuit to have phase lag from 80degree to100degree')
+disp('using a 741op-amp the input signal  has a 1volt amplitude and a 5kHz frequency')
+Vi=1
+f=5000
+disp('I1>IBmax')
+disp('let I1=50*10^(-6)A')
+IBmax=500*10^(-9)
+I1=50*10^(-6)
+disp('R1=Vi/I1')
+R1=Vi/I1
+disp('ohms',R1)
+disp('use 18kohm standard value')
+R1=18000
+disp('R2=R1=18kohm')
+R2=18000
+disp('R3=R1||R2')
+R3=R1*R2/(R1+R2)
+disp('ohms',R3)
+disp('for a 90degree phase shift,Xc1=R3')
+disp('C1=1/(2*%pi*f*R3)')
+C1=1/(2*%pi*f*R3)
+disp('farads',C1)
+disp('use 3600pF standard value')
+C1=3600*10^(-12)
+disp('for a 80degree phase shift,R3=tan(theta1/2)/(w*C1)')
+theta1=80
+R3=tan(theta1*%pi/180/2)/(2*%pi*f*C1)
+disp('ohms',R3)
+disp('for a 100degree phase shift,R3=tan(theta2/2)/(w*C1)')
+theta2=100
+R3=tan(theta2*%pi/180/2)/(2*%pi*f*C1)
+disp('ohms',R3)
+disp('for R3,use a 6.8kohm fixed value resistor in series with a 5kohm variable resistor to give a total resistance adjustable from 6.8kohm to 11.8kohm')
+\ No newline at end of file