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+//chapter3
+//example3.5
+//page58
+
+// use of Rsg = to obtain desired potential on screen grid since it is connected between power supply and screen grid
+// use of Csg = to provide ac grounding for the screen
+
+Ebb=300 // V
+Ib=10d-3 // A
+Rl=4.7d3 // ohm
+Rk=68 // ohm
+Isg=3d-3 // A
+Vsg=150 // V
+
+cathode_voltage=Ebb-(Ib*Rl)
+grid_cathode_bias=-Rk*(Ib+Isg) // since current through cathode resistance is Ib+Isg
+Rsg=(Ebb-Vsg)/Isg // since plate supply voltage = grid voltage + drop across Rsg
+Rsg_kilo_ohm=Rsg/10^3 // in kilo ohm
+
+printf("zero signal plate cathode voltage = %.3f V \n",cathode_voltage)
+printf("grid cathode bias = %.3f V \n",grid_cathode_bias)
+printf("Resistor Rsg = %.3f ohm or %.3f kilo ohm \n",Rsg,Rsg_kilo_ohm)