//chapter8 //example8.5 //page301 T=10*10^-3;//for proper operation of LED which remain ON for 10msec C=.22*10^-6//choose Vcc=15;Vbe=.7;Vcesat=.2;//given Vled=1.4;Iled=20*10^-3; //T=1.1RC R=T/(1.1*C); disp(R) Vo=Vcc-2*Vbe-Vcesat;//output of timer disp(Vo) Rled=(Vo-Vled)/Iled; disp(Rled)//this resistance must be in series whit LED f=1000;D=95;//for an astable timer C1=.01*10^-6; R1=%s;R2=%s; f=1.44/(R1+2*R2)*C;//frequency--------------eq(1) D=(R1+R2)/(R1+2*R2)//duty cycle-------------eq(2) R2=.0555*R1;//from eq(2) //put it in eq(1) R1=144*10^3/(1+2*.0555); disp(R1) R2=.0555*R1; disp(R2)