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Laboratory Exercises for Electronic Devices, Buchla, 2001 Prentice-Hall, Inc.

Experiment 6

Troubleshooting ProblemA student wires the circuit in Figure 6-1 and measures zeroolts across the base resistor, R1when the base suppl! "VBB# is

set to $%& '% (hich o) the listed troubles listed could account

)or this problem* a# VBB"base suppl!# is not

connected%

b# R1is ++& %

c# Base-emitter is shorted%

d# R$is open%

e# V"collector suppl!# is not

connected%

)# R1is shorted%

1 0 0

3 3 k

C o l l e c t o r V

C C

R 2

R 1

V B B

B a s e

E m i t t e r

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Laboratory Exercises for Electronic Devices, Buchla, 2001 Prentice-Hall, Inc.

Experiment 6

Troubleshooting Problem.olutionA student wires the circuit in Figure 6-1 and measures zero

olts across the base resistor, R1when the base suppl! "VBB# is

set to $%& '% (hich o) the listed troubles listed could account

)or this problem* a# VBB"base suppl!# is not

connected%

b# R1is ++& %

c# Base-emitter is shorted%

d# R$is open%

e# V"collector suppl!# is not

connected%

)# R1is shorted%

(hile answer )# is possible,an open in the pathindicated in blue "aboe#is

more liel!%

1 0 0

3 3 k

C o l l e c t o r V

C C

R 2

R 1

V B B

B a s e

E m i t t e r

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Laboratory Exercises for Electronic Devices, Buchla, 2001 Prentice-Hall, Inc.

Experiment 6

/elated Problem0arlington transistors are er! high beta deices with twocascaded transistors in the one pacage% Assume a0arlington transistor is tested in the circuit shown below% Fromthe data shown, what is the beta )or the 0arlington transistor*

VR2

VR1

1.33

V

2.70

V4 7

4 7 0 k

B a s e

E m i t t e r

C o l l e c t o r

R 1

V B B

V C C

R 2

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Laboratory Exercises for Electronic Devices, Buchla, 2001 Prentice-Hall, Inc.

Experiment 6

/elated Problem .olution0arlington transistors are er! high beta deices with twocascaded transistors in the one pacage% Assume a0arlington transistor is tested in the circuit shown below% Fromthe data shown, what is the beta )or the 0arlington transistor*

VR2

VR1

1.33

V

2.70

V4 7

4 7 0 k

B a s e

E m i t t e r

C o l l e c t o r

R 1

V B B

V C C

R 2

0

$&,+&&

20,300===

=

==

=

==

A3.2

mA4.!7"

mA4.!747

#2.70

A3.2k470

#1.33

$C

2

2

1

1

B

C

R

C

R

B

I

I

R

VI

R

VI