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diff --git a/1691/CH1/EX1.19/Example1_19.sce b/1691/CH1/EX1.19/Example1_19.sce
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+++ b/1691/CH1/EX1.19/Example1_19.sce
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+//Example 1.19
+clc
+disp("Here, output terminals are B and ground, thus the forward gain is the gain of Q1 and it is,")
+disp("  A_v= -33.11")
+disp("Here  beta = V_f / V_B = V_f/V_o * V_o/V_C * V_C/V_B")
+disp("where V_B and V_C are voltages at point B and C, respectively.")
+disp("Therefore,  beta_BN = V_f/V_o * A_v3 * A_v2         because V_o/V_C = A_v3 and V_C/V_B = A_v2")
+bbn=(5*10^-5)*(33.11^2)
+format(7)
+disp(bbn,"Therefore,  beta= ")
+avf=-33.11/2.815
+format(6)
+disp(avf,"Therefore,  |A_vf| = A_vf / 1+|A_f|*beta =")