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//Variable declaration
Vi=25 //input voltage(V)
Vsmax=30 //supply voltage max(V)
Vomin=12 //output minimum voltage or load voltage(V)
Vl=12
R1=20 //load voltage(V)
Io=15. //output current(mA)
Iq=3. //quinscent current of regulator(mA)
Vo=20. //output voltage(V)
//Calculations
//Part a
//(i)
Vimax=Vsmax //maximum permissible voltage(V)
Ro=0 //for Vomin=beta=0
//(ii)
Vomax=Vi-2
betaVomax=Vomax-Vomin //output voltage(V)
R2max=(R1*betaVomax)/(Vomax-betaVomax) //R2max(k ohms)
//(iii)
R3=betaVomax/Io //R3(k ohms)
//Part b
Vt=(Iq*betaVomax)/Io //common terminal fall(V)
Vomin1=Vl+Vt //voltage output minimum(V)
//Part c
betaVo=Vo-Vl //output voltage(V)
beta=betaVo/Vo //current gain
R2=(R1*betaVo)/(Vo-betaVo) //R2(ohms)
//Results
printf ("a)i)max permissible supply voltage is %.1f V",Vimax)
printf ("ii)output voltage range for Vi=25V is %.1f V to %.1f V and R2max is %.f k ohms",Vomin,Vomax,R2max)
printf ("iii)R3 is %.2f kohms kohms",R3)
printf ("b)Vomin is %.1f V",Vomin1)
printf ("c)R2 is %.2f ohms and R3 is %.3f ohms",R2,R3)
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