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Syponsis of
Portable Advertising Board
March , 2012
INTRODUCTION
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Portable advertising board is used for display purposes at shops, offices, malls,
theatres, railway station, airport and for advertisement of different products.
In this, CD 4017 IC is used for controlling the intensity of LEDs and IC 555 is
used as a timer.
Output is obtained through LEDs.
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COMPONENTS USED
DIODE 4007
Diffused Junction. High Current Capability and Low Forward Voltage Drop. Surge Overload Rating to 30A Peak. Low Reverse Leakage Current.
DIODE 4148
Hermetically sealed leaded glass SOD27 (DO-35) package
High switching speed: max. 4 ns
General application
Continuous reverse voltage: max. 100 V
Repetitive peak reverse voltage: max. 100 V
Repetitive peak forward current: max. 450 mA.
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IC 555
The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse
generation and oscillator applications. Depending on the manufacturer, the
standard 555 package includes over 20 transistors, 2 diodes and 15 resistors on asilicon chip installed in an 8-pin mini dual-in-line package.
ZENER DIODE
A Zener diode is a special kind of diode which allows current to flow in the
forward direction same as an ideal diode, but will also permit it to flow in the
reverse direction when the voltage is above a certain value known as the
[[breakdown voltage], "Zener knee voltage" or "Zener voltage.
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CD 4017
Pin
numberName Purpose
1 6 The 6th sequential output
2 2 The 2nd
sequential output
3 1 The 1st
sequential output
4 3 The 3rd
sequential output
5 7 The 7th
sequential output
6 8 The 8th
sequential output
7 4 The 4th
sequential output
80V,
VDD
The connection to the 0V rail
9 9 The 9th
sequential output
10 5 The 5th
sequential output
11 10 The 10th
sequential output
12 CO
Carry out output - outputs high on counts 0 to 4, outputs low on
counts 5 to 9 (thus a transition from low to high occurs when
counting from 9 back to 0)
13 LELatch enable - latches on the current output when high (i.e. the
chip counts when LE is low)
14 CLK Clock in
15 RSTReset - sets output 1 high and outputs 2 through 10 low, when
taken high
16+9V,
VCC
The connection to the +VCC rail (voltage between +3V and
+15V)
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LED
This is a very basic 5mm LED with a red lens. It has a typical forward voltage of
2.0V and a rated forward current of 20mA.
Features:
1.8-2.2VDC forward drop Max current: 20Ma Suggested using current: 16-18m Luminous Intensity: 150-200mcd.
RESISTOR
The electrical resistance of an electrical element measures its opposition to the
passage of an electric current; the inverse quantity is electrical conductance,
measuring how easily electricity flows along a certain path.
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STEP DOWN TRANSFORMER
Step down transformers are designed to reduce electrical voltage. Their primary
voltage is greater than their secondary voltage. This kind of transformer "steps
down" the voltage applied to it.
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WORKING
Power supply is given to the step- down transformer. Preset is connected to timer
IC 555 which control the output pulse of IC 555 to flash LEDs for the given time.
Intensity of LEDs depend on CD 4017 IC. Diode 4148 helps to supply power to
the circuit and diode 4007 works for reversal of flashing.
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CONCLUSION
Display board is ready to use. Flashing could be in any form and any sequence can
be adopted. Reversal of flashing can also be done..
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REFRENCES
[1] B. G. Streetman and S. Banerjee Solid state electronics devices, 5th Edition, PHI.
[2] M. Morris Mano and M. D. Ciletti, Digital Design, 4thEdition, Pearson Education.
[3]A. S. Sedra and K. C. Smith, Microelectronic Circuits, Oxford University Press, 5thedition.
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