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+//chapter13
+//example13.16
+//page290
+
+Ao=1000
+Rout=1 // ohm
+Rl=4 // ohm
+Rin=2d3 // ohm
+I2=0.5 // A
+
+// here I2/I1=Ao*Rin/(Rout+Rl) so
+I1=I2*(Rout+Rl)/(Ao*Rin)
+V1=I1*Rin // in V
+
+printf("required input signal voltage = %.3f mV \n",V1*1d3)
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