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diff --git a/281/CH10/EX10.3/example10_3.sce b/281/CH10/EX10.3/example10_3.sce
new file mode 100755
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+disp('chapter 10 ex10.3')
+disp('given')
+disp('design a phase shift oscillator to have output frequency of 6kHz and to give maximum output of +or-3volt')
+Vo=3
+f=6000
+disp('let I2=1mA when diodes are forward-biased,i.e peak output Vp=3volt and Vf=0.7volt')
+I2=1*10^(-3)
+Vf=0.7
+disp('R1=Vo/29/I2')
+R1=Vo/29/I2
+disp('ohms',R1)
+disp('use 100ohm standard value')
+R1=100
+disp('R2=29*R1')
+R2=29*R1
+disp('ohms',R2)
+disp('R3=2*Vf/I2')
+R3=2*Vf/I2
+disp('ohms',R3)
+disp('use 1.5kohm standard value')
+R3=1500
+disp('R4=R2-R3')
+R4=R2-R3
+disp('ohms',R4)
+disp('R5=0.4*R4')
+R5=0.4*R4
+disp('ohms',R5)   //use a 1kohm potentiometer
+disp('R6=0.8*R4')
+R6=0.8*R4
+disp('ohms',R6)  //use 1.2kohm standard value
+disp('R=R1=100ohm')
+R=100
+disp('C=1/(2*%pi*R*f*sqrt(6))')
+C=1/(2*%pi*R*f*sqrt(6))
+disp('farads',C)  //standard value
+disp('diodes D1 through D4,trrmax=T/10')
+trrmax=1/(f*10)
+disp('seconds',trrmax)
+disp('Vrmax>Vcc=+or-15volt')
+disp('the IN914 has trr=4ns and Vrmax=75volt use IN914 diodes')
+\ No newline at end of file