Ch-17 : Blocking Oscillators and Time Based Generators

Page No. 536 Example 17.1.

RE=(20-2.9)/(1.6) # in k-ohm
print "RE < VBB-VP/IP, i.e.  RE(k-ohm) < 20-2.9/1.6*10**-3 =%0.2f kohm"%RE
RE=(20-1.118)/(3.5) # in k-ohm
print "RE > VBB-VV/IV, i.e.  RE(k-ohm) < 20-1.118/3.5*10**-3 =%0.2f kohm"%RE
# answer in textbook is wrong
CE=1./(500*(2.303*10**4)*0.36) # in farady
x1=CE*10**6 # in uF
print "Therefore,  CE  = %0.2f uF"%x1
R1=5./(250*10**-3) #in ohm
print "Therefore,  R1 = VR1/IE =%0.2f ohm"%R1
R2=11000./250
print "  R2(ohm) = 11*10**3/250 =%0.2f ohm"%R2

RE < VBB-VP/IP, i.e.  RE(k-ohm) < 20-2.9/1.6*10**-3 =10.69 kohm
RE > VBB-VV/IV, i.e.  RE(k-ohm) < 20-1.118/3.5*10**-3 =5.39 kohm
Therefore,  CE  = 0.24 uF
Therefore,  R1 = VR1/IE =20.00 ohm
  R2(ohm) = 11*10**3/250 =44.00 ohm