8/17/2019 UNIT 5- Onemarks-tamil Lic
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24044— linear integrated circuits
Unit-V
UNIT 5- SPECIAL FUNCTION IC’S
1. What is IC 555?
The timer IC 555 எப linear integrated device ஆ�ம . இ ஒ
basic monolithic timer circuit ஆ. இ
தவயன time delay உவக பயனபகற .
2. What are the uses of IC 555?
IC 555 timer எப monostable multivibrator ப
stable time delay
வ உவக { ல } astable
multivibrator ப oscillator -ஆக
பயபகற..
3. Draw the pin diagram of IC 555.
Pin No 1.Gnd, 2.Trigger,
3.Output, 4.Reset,
5.Control Voltage , 6.Threshold ,
7.Discharge, 8. Vcc
4. What the parts OR functional blocks of IC555 Timer?
1) Voltage divider 2) Threshold comparator
3) Trigger comparator 4) SR flip flop
5) Transistor
5. Write the applications of IC 555.
i) Astable multivibrator ii) Monostable multivibrator
iii) Schmitt trigger iv) Pulse width modulation
6. What is astable multivibrator?
Astable multivibrator எப relaxation oscillator . இ
square wave or rectangular wave – வ உவக
பயபகற. இதல இரண state-க
உள :- stable state – க இக,
இரண� quasi stable state இ.
7. what is monostable multivibrator?
Monostable multivibrator எப stable time delay- வ
உவ�கற . இதல ஒ stable state ம ஒ
quasi
stable state இ..
8. What is schmitt trigger?
Schmit trigger எப ஒ multivibrator வகய. இ மவக
vary ஆகற input signal – ஐ square
or
rectangular signal – ஆக convert
சகற.
9. What is the time period of quasistable state of monostate
multivibrator using IC 555?
T=1.1 RC sec
10. What is the time period & Duty cycle of astable
multivibrator using IC 555?
11. What is a voltage regulator?
IC regulator ஆன line ம load மறஙக
தநதவ regulate சயபட constant – ஆன
output
voltage – ஐ தகற.
12. Mention two types of positive voltage regulator IC’s.
Three types (i) Three terminal fixed-voltage regulator
(For both positive and negative voltages)
(ii) Adjustable output Voltage regulators
(iii) Precision Voltage regulators.
~~All The Best~~ Sukesh. R / ECE,GRG Polytechnic College,
CBE-107.
8/17/2019 UNIT 5- Onemarks-tamil Lic
2/2
24044— linear integrated circuits
Unit-V
13. What is 78 XX series IC?
IC 78 XX postive voltage regulated IC . This is
example for three terminal positive voltage regulators,Which
provide fixed voltages from +5v to +24v.
EX:
14. What is 79 XX series IC?
IC 79 XX is a negative voltage regulated IC .
This is example for three terminal positive voltage
regulators,Which
provide fixed voltages from -5v to -24v.
15. What is IC 723?
IC 723 எப general purpose precision regulator. இ
ஒ monolithic linear integrated circuit ஆ�ம. இ
பலதரபட package- கள�ல கட. A) 14 pins in Dual
In Line Pacakage B) 10 pins in Metal Can Package
16. Give any two features of IC 723.
i) 150mA output current without external pass
transistor.
ii) output current excess of 10A possible by adding
external transistors.
iii) Input Voltage 40V max
iv) Output voltage : 2V to 37 V.
17. Mention the two important sections of IC 723.
It has two separate sections.They are, i) Zener diode and
constant current source ii) Reference amplifier
18. What are the voltage ranges of Low voltage an high voltage
regulator using LM 723?
Low voltage regulator : 2V to 7V High voltage regultor : 7V to
37V
19. write the application of LM 723?
Shunt regulator, Current regulator, temprature controller,
etc.,.
PART B – 12 MARKS
1. Explain IC 555 with pindetails & neat functional
block diagram.
2. Explain Astable multivibrator
3.
Explain Monostable multivibrator
4. Explain Schmitt trigger.
5. Problems on multivibrator.
6. Explain voltage regulator with Positive voltage
regulator (78XX series) & negative voltage regulator (79XX
series).
7. Explain LM 723With pin diagram & functional block
diagram (6 Marks)
8. Explain Low voltage regulator using LM 723 (6
Marks)
9.
Explain High voltage regulator using LM 723 (6 Marks)
IC Output Voltage Mininmum Input Vtg7805 +5 7.3
7812 +12 14.6
7824 +24 27.1
IC Output Voltage Mininmum Input Vtg
7905 -5 7.3
7912 -12 14.6
7924 -24 27.1
~~All The Best~~ Sukesh. R / ECE,GRG Polytechnic College,
CBE-107.
