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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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