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diff --git a/281/CH10/EX10.5/example10_5.sce b/281/CH10/EX10.5/example10_5.sce
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+disp('chapter 10 ex10.5')
+disp('given')
+disp('design a signal generator output stage to afford output amplitude from +or-0.1 to 5volt')
+Vomin=0.1
+Vomax=5
+disp('dc voltage level control over a range of +or-2.5volt')
+disp('signal applied output stage has a +or-1volt amplitude and frequency ranging from 50Hz to 20kHz')
+Vi=1
+fmin=50
+fmax=20000
+VR4=2.5-(-2.5)
+disp('using a bipolar op-amp with a +or-15volt supply')
+Vcc=15
+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('R2max=Vomax/Vi*R1')
+R2max=Vomax/Vi*R1
+disp('ohms',R2max)
+disp('R2min=Vomin/Vi*R1')
+R2min=Vomin/Vi*R1
+disp('ohms',R2min)
+disp('for R2,use a 100kohm potentiometer in series with a 1.8kohm resistor')
+disp('I3>IBmax')
+disp('let I3=50*10^(-6)A')
+I3=50*10^(-6)
+disp('R4=VR4/I3')
+R4=VR4/I3
+disp('ohms',R4)    //standard potentiometer
+disp('R3=VR3/I3')
+VR3=Vcc-2.5
+R3=VR3/I3
+disp('ohms',R3)
+disp('use 220kohm to give larger output adjustment than required')
+disp('R5=R3=220kohm')
+disp('Xc1<R1 at fmin')
+disp('let Xc1=R1/10 at fmin')
+disp('C1=1/(2*%pi*fmin*R1/10)')
+C1=1/(2*%pi*fmin*R1/10)
+disp('farads',C1)   //standard value
+\ No newline at end of file