77453861 Video Audio Wireless Transmitter Project for You

8/13/2019 77453861 Video Audio Wireless Transmitter Project for You

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Video/Audio Wireless Transmitter project for ou

A!stract"To design and build a wireless transmitter that works over the ! fre"uenc# and allows the

transfer of a video$audio signal over a certain distance to an ! tuner%

Introduction"

&n this fast'paced world( there is little time for inconveniences and a greater need for portabilit#

and adaptabilit#% The idea for an Audio$)ideo transmitter stems from this need% There ma# have

been times when #ouve wanted to hook up #our )C* from one room to another television set inanother room% +ut that would have entailed that #ou first unhook all kinds of wires and plugs

from the primar# T) set, carr# the )C* to the ne-t T) set, and then finall# re'wire ever#thing

together% An Audio$)ideo transmitter will let #ou do just about the same thing% +ut it would

offer other conveniences as well% or e-ample( it would allow #ou to set up securit# camerasaround #our home which would send video signals directl# to a T) or )C*% And( there are no

cumbersome wires and cables to line throughout the intended area% .esign / .evelopment01hat we did23

The most difficult part of this project was coming up with a design that would work% +ecause

both of us had ver# little e-perience with * signal s#stems we had to learn( basicall#( from

scratch% The approach we took( was to first create a video transmitter( then add the audio portionlater% This wa# we could test each component individuall# and then integrate them later when we

knew both parts were working correctl#% 1e first went to the 4rainger 5ibrar# to research

various transmitters designs and how the# were built% Although all the books were ver# old( wewere able to gather some useful information from various sources% !ost of the books had onl#

information about sending audio transmission and had ver# little on video signal transmissions%Also( some books that had some kind of designs and data for video tranmission were ver#outdated% +ut we found some interesting standards that help e-plained what television stations

used% This was not too far from what our original intentions were on building two different t#pes

of transmitters% 5et us first look at the basic block diagram of what and how Audio$)ideotransmission works% rom the book3 Television 6lectronics b# 7iver and 7aufman 08th ed%2

Cop#right 9:8;, there is a block diagram of the television transmitter 0page :( 7iver and

7aufman2%
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As #ou can see( television signals operates as two separate transmissions% '?9@ !h2

UH 9> through @: 0>BD'8D@ !h2

UH BD'8; 08D@'8:D !h2 currentl# assigned to land mobile radio services

+elow is a table that show the specific fre"uenc# band assignment to the channels designations

0page >( 1hitaker2%

rom the table above( we see that all channels assignments are @ !h apart% And from 7iver and7aufman 0page ?D'?92 there is a listing of all of the corresponding television channels to their

fre"uencies with much greater detail showing the picture carrier and the sound carrier

assignments% Although based on cable standards( it is identical to the airwave standards set b#

the CC% 1ithin the @ !h range the picture and sound carrier are within ? !h from the endsand also about ? !h apart from each other% This leaves about > !h in between each channels%

Implementation #$ow we did it%"

After searching high and low we have come across a diagram of some audio transmission

schematic which was claimed to also be capable of transmitting video signals% The device waslater found out to be known as the repeater% &n the following pages we have printed up the

schematics that we used to build our devices% Two devices were built 0as noted above as to wh#two different transmitters are needed2% 1e had various difficulties with implementing the video

transmitter design% 1e discovered that somehow a :v batter# did not deliver enough power to the

circuit produce a strong clean signal% =o a bench power suppl# was used to run the circuit%

1e have also learned that not using an insulated crossdriver to tune our circuit to the correctfre"uenc# gave us a lot of problems% =o( for an alternative solution( we used an old


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clock$radio$T) with an analog tuner to test our design% This allowed for fine tuning with a plastic

knob when searching correct fre"uenc#%

The audio transmitter eventuall# worked% +ut the audio signal was wrought with interference andfluctuations depending on the distance between the transmitter( the receiver and the position of

the transmitters antenna% Also( since the devices were built in a ver# crude manner( it was ver#prone to noise interference creating highl# distorted signals%

Audio/Video transmitter sc&ematic

There was another design for video transmission found from the book3 The 4iant +ook of6lectronics Projects b# The 6ditors of B; !againe 09st ed% 9@th printing2 Cop#right 9:8? 0page

>@>2%

1e didnt build this design since we didnt know some of the undefined values 0or at least the#

were not properl# determined and purposel# left undefined2% Conclusion 0*esults23

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*s ?DD etc2%&n our project we have given the name for memor# card as smart card%

1hen the consumer insert a smart card into the card reader which is connected in prepaid

energ# meter with tariff indicatorkit%Then the card reader will read the stored information anddelete the information from the 66P*

smart card cannot be reused b# others% =uppose if a consumer bu# a card for *s%D$' he $ she can

insert this amount through the card reader so that prepaid energ# meter with tariff indicator kitwill be activated% According to the power consumption the amount will be reduced% 1hen the

amount is over( the rela# will automaticall# shutdown the whole s#stem% &n our project we also

have a provision to give an alarm sound to consumer before the whole amount is reduced%

The cards are

nothing but the 66P*CD>%

0all s at *)2))123),

+T4NET+ 0A55IN6 789( 9T+I4E IN4IA 5EA+E 8E7I: *1 ;E798E T$E

N(;E8+ 98 4IA5 *1*313E0T AN4 =IT+

=eptember ?9( ?DD8Posted b# &ndian6ngineerG UncategoriedG : Comments

microprocessor projects Water le?el 0ontroller

The water level Controller is a reliable circuit, it takes over the taskof indicating and Controlling the water level in the overhead water

tanks. The level of the water is displayed in the LED Bar graph. TheCopper probes are used to sense the water level. The probes are

inserted into the water tank which is to be monitored. This water

level Controller!!!alarm circuit is configured around the wellknown " bit #icroprocessor "$"%. &t continuously monitors the

overhead water level and display it and it also switch 'ff the #otorwhen the tank fills and it will automatically switch 'n the #otor

when the water level is low. The #icroprocessor will also indicate
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the water level over the LED display. (ll the input and outputfunctions are done through the )rogrammable )eripheral &nterface

&C "*%%.

final #ear projects

=eptember 9B( ?DD8Posted b# &ndian6ngineerG UncategoriedG ?@ Comments
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(I08909NT8955E8 ;A+E4 89>E0T+ for final

ear electronics

latest projects ?D9D special%%

Automatic *ailwa# 4ate Control / Track =witching0 5AT6=T2

Put Coin And .raw Power 0latest2 for 6lectrical and 6lectronics%

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@% !&C'8:C9 !


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+T4ENT+ 789( +9T$ IN4IA 0A55 *313


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=eptember 9( ?DD8Posted b# &ndian6ngineerGprojects list(UncategoriedG ?9> Comments

89>E0T 9N WI8E5E++ 4ATA AN4 V9I0E

09((NI0ATI9N T$896$ IN78A8E45E4

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transmitter section and second part receiver section% =lide switch selected to voice

communication and data%

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9;% This parameter also applies to a third tone injected onto

the power suppl#%

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+5> to 9@ line decoder &C B>9> and he- inverter gate &C >D>:% The working of all the above &Cs

are mentioned here before%The .T! to +C. decoder &C !T88BD takes a valid tone signal from the &* transmitter

section% Then the tone signal is converted in to > bit +C. number output obtained at pins from

99 to 9>% This output is fed to the >'9@ line decoder &CB>9>% This &C takes the +C. number anddecodes% According to that +C. number it selects the active low output line from 9 to 9@ which

is decimal e"uivalent of the +C. number present at its input pins% =ince the low output of this &C

the output is inverted to get logic high output% This inversion is carried out b# he- inverter &C

>D>:' built on TT5 logic% This &C inverts the data on its input terminal and gives inverted output%;% .evice switching unit3

This unit consists of a tri state buffer and a . flip flop% After making confirmation of current

status of the device to alter the status of that device( #ou have to change the mode of the tri statebuffer b# making the control input high% This is done b# pressing the N ke#% 1hen this ke# is

pressed the output of the >'9@ line decoder goes low The output of tri state buffer is latched

b# using a . flip'flop% Here this . flip flop is used in the toggle mode% or each positive going

edge of the clock pulse will trigger the flip'flop%After a period of seconds the output of the &C @ goes low and puts the tri state buffer in the

high impedance state% Therefore to change the status of an# other device is to be done after the

output of &C @ goes low( again N ke# is pressed to make the tri state buffer act as input outputstate and the respective code of the device is pressed%

>% Power suppl# unit3

or the proper working of this local control section e-cept the local telephone set it needs apermanent back up which gives a ) back up continuousl#% This is achieved b# using a )


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regulated power suppl# from a voltage regulated &C B8D% This ) source is connected to all &Cs

and rela#s% This &C gets a backup from a :) batter#%

% *ela# driver circuit3To carr# out the switching of an# devices we commonl# use the rela#s% =ince the output of the .

flip flop is normall# S) or it is the voltage of logic high state% =o we cannot use this output to

run the device or appliances% Therefore here we use rela#s( which can handle a high voltage of?;D) or more( and a high current in the rate of 9DAmps to energie the electromagnetic coil of

the rela#s S) is sufficient% Here we use the transistors to energie the rela# coil% The output of

the . flip'flop is applied to the base of the transistor T? T via a resister% 1hen the basevoltage of the transistor is above D%B) the emitter'base 06+2 junction of the transistor forward

biased as a result transistor goes to saturation region it is nothing but the switching


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the remote section so same cr#stal oscillator with fre"uenc# of ;%8! H is used in this &C%

1orking of &C !T88BD3

The !T'88BD is a full .T! *eceiver that integrates both band split filter and decoderfunctions into a single 98'pin .&P% &ts filter section uses switched capacitor technolog# for both

the high and low group filters and for dial tone rejection% &ts decoder uses digital counting

techni"ues to detect and decode all 9@ .T! tone pairs into a >'bit code% 6-ternal componentcount is minimied b# provision of an on'chip differential input amplifier( clock generator( and

latched tri'state interface bus% !inimal e-ternal components re"uired include a low'cost

;%B:> !H cr#stal( a timing resistor( and a timing capacitor% The !T'88BD'D? can alsoinhibit the decoding of fourth column digits%

!T'88BD operating functions include a band split filter that separates the high and low tones of

the received pair( and a digital decoder that verifies both the fre"uenc# and duration of the

received tones before passing the resulting >'bit code to the output bus%The low and high group tones are separated b# appl#ing the dual'tone signal to the inputs of two

@th order switched capacitor band pass filters with bandwidths that correspond to the bands

enclosing the low and high group tones%

igure 02%+lock diagram of &C !T88BD

The filter also incorporates notches at ;D and >>D H( providing e-cellent dial tone rejection%

6ach filter output is followed b# a single'order switched capacitor section that smoothes the

signals prior to limiting% =ignal limiting is performed b# high gain comparators provided with b#stresses to prevent detection of unwanted low'level signals and noise% The !T'88BD decoder

uses a digital counting techni"ue to determine the fre"uencies of the limited tones and to verif#

that the# correspond to standard .T! fre"uencies% 1hen the detector recognies the

simultaneous presence of two valid tones 0known as signal condition2( it raises the 6arl# =teeringflag 06=t2% An# subse"uent loss of signal condition will cause 6=t to fall% +efore a decoded tone

pair is registered( the receiver checks for valid signal duration 0referred to as character'recognition'condition2% This check is performed b# an e-ternal *C time constant driven b# 6=t%A short dela# to allow the output latch to settle( the dela#ed steering output flag 0=t.2 goes high(

signaling that a received tone pair has been registered% The contents of the output latch are made

available on the >'bit output bus b# raising the three state control input 0 !H cr#stal%The input arrangement of the !T'88BD provides a differential input operational amplifier as well

as a bias source 0)*62 to bias the inputs at mid'rail% Provision is made for connection of a

feedback resistor to the op'amp output 04=2 for gain adjustment%The internal clock circuit is completed with the addition of a standard ;%B:> !H cr#stal%

B>9> >'9@ line decoder$demultiple-er3

&C B>9> is a >'9@ line decoder( it takes the > line +C. input and selects respective output one


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among the 9@ output lines% &t is active low output &C so when an# output line is selected it is

indicated b# active low signal( rest of the output lines will remain active high% This >'line'to'9@'

line decoder utilies TT5 circuitr# to decode four binar#'coded inputs into one of si-teenmutuall# e-clusive outputs when both the strobe inputs( 49 and 4?( are low% The demultiple-ing

function is performed b# using the > input lines to address the output line( passing data from one

of the strobe inputs with the other strobe input low% 1hen either strobe input is high( all outputsare high% These demultiple-er are ideall# suited for implementing high'performance memor#

decoders%

igure 4% &C B>9> >'9@ line decoder

All inputs are buffered and input clamping diodes are provided to minimie transmission'lineeffects and thereb# simplif# s#stem design%

T*UTH TA+563

&C >D9; .'flip'flop3

&C >D9; is a conventional .'flip'flop &C% This &C consists of two . flip'flops% These flip'flops

are used to latch the data that present at its input terminal% 6ach flip'flop has one data( one clock(one clear( one preset input terminals%

0Above figure shows a single .'flip'flop2

*ela# driver circuit3To carr# out the switching of devices we commonl# use the rela#s% =ince the output of the . flip

flop is normall# S) or it is the voltage of logic high state% =o we cannot use this output to run

the device or appliances% Therefore here we use rela#s( which can handle a high voltage of ?;D)or more( and a high current in the rate of 9DAmps to energie the electromagnetic coil of the

rela#s S) is sufficient% Here we use the transistors to energie the rela# coil% The output of the

. flip'flop is applied to the base of the transistor T? T via a resister% 1hen the base voltage ofthe transistor is above D%B) the emitter'base 06+2 junction of the transistor forward biased as aresult transistor goes to saturation region it is nothing but the switching


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Circuit performance3 =table S8) output voltage( reliable

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77453861 Video Audio Wireless Transmitter Project for You