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  Multivibrators Using IC 555

Introduction to Construction and Testing of Multivibrators Using IC 555:

To check the multi vibrators using IC 555.

COMPONENTS REQUIRED:

S. No

Name of Component/Apparatus

Range

Quantity

1.

2.

 

 

3.

4.

5.

6.

IC 555

Resistance

 

 

Capacitor

Transistor

Bread Board

CRO with Probe

 

1kΩ,

5kΩ,

100kΩ

0.01μF

NPN

-

-

1

2

3

1

2

2

1

1

ASTABLE MULTIVIBRATORS:

Astable Multivibrators is Multivibrators produce dissimilar types of wave forms. By Using IC 555 the circuit is assembled. It contains no stable output.   That is variation of output takes place as per the requirement. Thus we acquire a square wave forms. We can discover the output and voltage range of the capacitor by using the table.

1679_Multivibrator Homework Help.jpg

Figure: Astable Multivibrator

CALCULATIONS:

1. The charging time of the capacitor is provided by

Tc = Charging time = 0. 693 (RA+ RB )C ms

2. While discharging time is provided by,

Td = Discharging time = 0.693 (RB) C ms

3. Hence the Total time for one cycle.

T =    TC +Td

=    0.693 (RA+ RB)C + 0.693(RB)C ms

=    0.693 (RA + 2RB)C

4. The Frequency of oscillators is provided by:

F = 1/T = 1/0.693(RA + 2RB)C OR 1.44/(RA + 2RB)C KHz

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