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+//Finding the Circuit values of a programmable UJT triggering circuit
+//Example 17.3(Page No-776) 
+clc
+clear
+//given data 
+Vs=30//V
+Ig=1*10^-3//A
+f=60//Hz
+tg=50*10^-6//sec
+Vrk=10//V
+T=1/f//time period
+Vp=Vrk//peak triggering voltage
+C=0.5*10^-6//F (assume)
+Rk=tg/C
+printf('value of Rk:%.2f ohm\n',Rk)
+n=Vp/Vs
+printf('intrinsic ratio n:%.2f\n',n)
+r=1/(f*C*log(Vs/(Vs-Vp)))
+R=r*10^-3
+printf('R:%.1f ohms\n',R)
+Rg=Vs*(1-n)*10^-3/Ig//in kilo-ohms
+printf('Rg:%d kohms\n',Rg)
+R1=Rg/n//in kiloohms
+R2=Rg/(1-n)//in kiloohms
+printf('R1:%d kohms\n',R1)
+printf('R2:%d kohms\n',R2)