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diff --git a/2045/CH4/EX4.38/Ex4_38.pdf b/2045/CH4/EX4.38/Ex4_38.pdf
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diff --git a/2045/CH4/EX4.38/Ex4_38.sce b/2045/CH4/EX4.38/Ex4_38.sce
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+//pagenumber 222 example 38

+clear

+vb=0.7;//volt

+vce=7;//volt

+ic=1*10^-3;//ampere

+vcc=12;//volt

+beta1=100;

+colres=(vcc-vce)/ic;

+ib=ic/beta1;

+//rb

+rb=(vcc-vb-ic*colres)/ib;

+disp("rb   =   "+string((rb))+" ohm");

+//stability

+stability=(1+beta1)/(1+beta1*(colres/(colres+rb)));

+disp("stability   =   "+string((stability)));

+//beta=50

+beta1=50;

+disp("new point");

+ib=(vcc-vb)/(beta1*colres+rb);

+ic=beta1*ib;

+disp("ic   =   "+string((ic))+" ampere");

+vce=vcc-(ic*colres);

+disp("vce   =   "+string((vce))+" volt");