Power Supply Regulator Quiz #1

08/25/2001

Regarding the Solid State Series-Pass Regulator shown in Figure #3 of this Schematic ( 93Kb PDF),
    see if you can determine these possible events:

In the "Reaction Column" choose between the two choices given.

 Problem:
 Occurance:

 Reaction:

 1
 Q3 has an Emitter to Collector Short  Ecc  increases/decreases

 2
 Zener Diode Z1 opens  Q1's conduction  increases/decreases

 3
 R1 opens  Q3's conduction  increases/decreases

 4
 The Collector of Q3 opens  R4's current  increases/decreases

 5
 R2 increases resistance  Ecc  increases/decreases

 6
 Q2 is replaced with a lower Beta  Ecc  increases/decreases

 7
 If Ecc is too high  R3 should be  increased/decreased

 8
 RL increases resistance  Q2's conduction  increases/decreases

 9
 R3 loses the ground connection  Ecc  increases/decreases

 10
 Q3 concucts more  Q1's conduction  increases/decreases

 11
 RL is removed  Q3's conduction  increases/decreases

 12
 Q2 conducts more  Q3's conduction  increases/decreases

 13
 Q3 is replaced with a higher Beta  Ecc  increases/decreases

 14
 Q1 is replaced with a higher Beta  Ecc  increases/decreases

 15
 Q2's Collector opens  Q3's conduction  increases/decreases

What is wrong or missing in the design of this circuit in the area of Q2?


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