1 files changed, 26 insertions, 0 deletions
diff --git a/281/CH9/EX9.3/example9_3.sce b/281/CH9/EX9.3/example9_3.sce
new file mode 100755
index 000000000..bd09503de
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+++ b/281/CH9/EX9.3/example9_3.sce
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+disp('chapter 9 ex9.3')
+disp('given')
+disp('design an inverting Schmitt trigger circuit to have trigger points of +or-2volt')
+disp('using 741 op-amp with a supply of +or-12volt')
+disp('I2>IBmax')
+disp('let I2=50*10^(-6)A')
+IBmax=500*10^(-9)
+I2=50*10^(-6)
+Vcc=12
+disp('VR2=UTP=2volt')
+VR2=2
+disp('R2=VR2/I2')
+R2=VR2/I2
+disp('ohms',R2)
+disp('use 39kohm standard value and recalculate I2')
+R2=39000
+disp('I2=VR2/R2')
+I2=VR2/R2
+disp('amperes',I2)
+disp('VR1=Vosat-VR2=(Vcc-1)-VR2')
+VR1=(Vcc-1)-VR2
+disp('volt',VR1)
+disp('R1=VR1/I2')
+R1=VR1/I2
+disp('ohms',R1)
+disp('use 180kohm standard value')
+\ No newline at end of file