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Laboratory Exercises for Electronic

Devices, Buchla, © 2001 Prentice-Hall,

Inc

Experiment 24

Troubleshooting Problem

A student constructsthe circuit shownbelow and fnds that

the output is hal-wave rectifed! eescope view"# Powersuppl$ voltages arechec%ed and correct#uggest a cause or

the problem# & ' ( )* n d

' ( ) +

, r o m, u n c t io n* e n e r a t o r

- )

- )

.nput/ (m)0div accoupled

1utput/ ( )0divac coupled

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Laboratory Exercises for Electronic

Devices, Buchla, © 2001 Prentice-Hall,

Inc

Experiment 24

Troubleshooting Problem

olutionA student constructsthe circuit shownbelow and fnds that

the output is hal-wave rectifed! eescope view"# Powersuppl$ voltages arechec%ed and correct#uggest a cause or

the problem#

- )

- )

.nput/ (m)0div accoupled

1utput/ ( )0divac coupled

The student ac coupled the scopeso missed the act that there is dc

oset on the input rom theunction generator! This causedthe output to nearl$ saturate#

The tendenc$ is to blame the op-amp frst3 but that is rarel$ the

problem#

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Laboratory Exercises for Electronic

Devices, Buchla, © 2001 Prentice-Hall,

Inc

Experiment 24

elated Problem

& ' ( )

* n d

' ( ) +

, r o m, u n c t io n

* e n e ra t o r

5raw the schematic or the circuit shown#5etermine the gain and the inputresistance#

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Laboratory Exercises for Electronic

Devices, Buchla, © 2001 Prentice-Hall,

Inc

Experiment 24

elated Problem olution

& ' ( )

* n d

' ( ) +

, r o m, u n c t io n

* e n e ra t o r

5raw the schematic or the circuit shown#5etermine the gain and the inputresistance#*ain 6 -'( %Ω07#7 %Ω 6 - 4#(4 R

in

6 7#7 %Ω

R i

! " " # Ω

1 $ # Ω

1 0 % &

1 0 % &

2

"

'

(

)*

* 1 $ +

( ) 1 ,

+

1 $ + +