Clock Pulse Generator Using the 555 Timer - IT Assignment Help

Assignment Task

Objective
To design and build a clock oscillator using a 555 timer IC.
 

Introduction
The clock frequency output of the 555 timer is given by:
f =
(
1.44
RA + 2RB)C
(1)
The period time of the clock is given as T =
1 and is shown as:
f
The duty cycle is defined as the ratio of ON time to the period time and is given by:
Duty cycle =
TON
T
=
TON
TON + TOFF
The ON time for the clock is given by:
0.69(RA + RB)C
The OFF time is given by:
0.69(RB)C
Therefore the duty cycle is given as:
ON time
clock period
=
0.69(RA +RB)C
0.69(RA+ RB)C + 0.69(RB)C
=
RA + RB
RA + 2RB

Design
Using the following component values:
RA = 20k
RB = 20K
C = 0.1uF
Calculate the oscillator frequency, the ON and OFF times.
Frequency =
ON time =
OFF time =

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