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diff --git a/281/CH11/EX11.4/example11_4.sce b/281/CH11/EX11.4/example11_4.sce
new file mode 100755
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+++ b/281/CH11/EX11.4/example11_4.sce
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+disp('chapter 11 ex11.4')
+disp('given')
+disp('design a first order active high-pass filter to have cutoff frequency 5kHz')
+disp('using LM108 op-amp which has extremely low input bias current,should be treated as BIFET op-amp thereforo C1=1000pF')
+C1=1000*10^(-12)
+fc=5000
+disp('R1=1/(2*%pi*fc*C1)')
+R1=1/(2*%pi*fc*C1)
+disp('ohms',R1)
+disp('use 31.6kohm+or-1% standard value')
+disp('R1=R2=31.6kohm')
+disp('from LM108 gain/frequencyresponse .the op-amp unity gain frequency is fu=1MHz')
+Av=1
+fu=1*10^(6)
+disp('f2=fu/Av')
+f2=fu/Av
+disp('Hz',f2)
+\ No newline at end of file