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diff --git a/991/CH20/EX20.4/Example20_4.sce b/991/CH20/EX20.4/Example20_4.sce
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+//Example 20.4.
+clc
+format(5)
+disp("The 741C has typical slew rate of 0.5 V/us. Using Eq.(20.8), the slew rate is,")
+disp("      SR = 2*pi*f*Vm / 10^6 = 0.5 V/us")
+vm=(0.5*10^6)/(2*%pi*(40*10^3)) // in volts
+disp("    = 3.98 V peak-to-peak",vm,"The maximum output voltage,  Vm(V peak-to-peak) = SR*10^6 / 2*pi*f =")
+disp("The maximum peak-to-peak input voltage for undistorted output is,")
+vid=3.98/10 // in volts
+format(6)
+disp(vid,"      Vid(V peak-to-peak) = Vm/A =")
+\ No newline at end of file