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?