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 conducts 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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