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diff --git a/181/CH3/EX3.18/example3_18.sce b/181/CH3/EX3.18/example3_18.sce
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+// Find DC output voltage,pulse frequency
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 3-18 in page 162
+
+clear; clc; close;
+
+// Given data
+Vp=230; // Peak voltage in V
+f=50; // Frequency in Hz
+Rl=200; // Load resistance in ohms
+N=1/4; // Turn ratio
+
+// Calculation
+Vs=Vp*N;
+Vm=Vs*sqrt(2);
+Idc=(2*Vm)/(%pi*Rl);
+Vdc=Idc*Rl;
+fout=2*f;
+printf("(a)DC output voltage = %0.2f V\n",Vdc);
+printf("(b)Pulse frequency of output = %0.0f Hz",fout);
+
+// Result
+// (a) Vdc = 51.77 V
+// (b) F_out = 100 HZ
+\ No newline at end of file
diff --git a/181/CH3/EX3.18/example3_18.txt b/181/CH3/EX3.18/example3_18.txt
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+ (a)DC output voltage = 51.77 V
+(b)Pulse frequency of output = 100 Hz 
+\ No newline at end of file