1 files changed, 44 insertions, 0 deletions
diff --git a/281/CH9/EX9.7/example9_7.sce b/281/CH9/EX9.7/example9_7.sce
new file mode 100755
index 000000000..7cb8f12a2
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+disp('chapter 9 ex9.7')
+disp('given')
+disp('design a monostable multivibrator to have output pulse width 1ms when triggered by 2volt,100*10^(-6)s input pulse')
+disp('using 741 op-amp with a supply of +or-12volt')
+PW=1*10^(-3)
+t=100*10^(-6)
+disp('I2>IBmax')
+disp('let I2=50*10^(-6)A and VBE=0.7volt')
+IBmax=500*10^(-9)
+I2=50*10^(-6)
+VBE=0.7
+Vcc=12
+disp('let VR2<Vi')
+disp('let VR2=0.5volt')
+VR2=0.5
+disp('R2=VR2/I2')
+R2=VR2/I2
+disp('ohms',R2)   //standard value
+disp('R1=(Vcc-VR2)/I2')
+R1=(Vcc-VR2)/I2
+disp('ohms',R1)
+disp('use 220kohm standard value')
+R1=220000
+disp('E=VR2-[-Vosat]')
+E=VR2-[-Vcc+1]
+disp('volts',E)
+disp('Eo=-(+Vosat-VR2)')
+Eo=-(Vcc-1-VR2)
+disp('volts',Eo)
+disp('ec=Vosat')
+ec=Vcc-1
+disp('volts',ec)
+disp('C2=PW/((R1||R2)*ln[(E-Eo)/(E-ec)])')
+C2=PW/((R1*R2/(R1+R2))*2.303*log10([(E-Eo)/(E-ec)]))
+disp('farads',C2)
+disp('R3max=0.1*VBE/IBmax')
+R3max=0.1*VBE/IBmax
+disp('ohms',R3max)
+disp('use 120kohm standard value')
+R3=120000
+disp('C1=0.1*t/R3')
+C1=0.1*t/R3
+disp('farads',C1)
+disp('use 91pF standard value')
+\ No newline at end of file