8/12/2019 transmissor com o LM 1889 (em inglês)

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Circuit Power transmitter of communitarian wireless TV lm1889 audio and video

By Toni on Aug 19, 2009 with Comments 21 Viewed 13,564 views times

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Potent circuit for transmitter of communitarian TV with lm1989 in vhf channels, video link for V,com!uter or video camera transmitter 

This small circuit transmitter !rocesses the si"ns of audio of a sound ta#le or micro!hone, and thesi"ns of video of a camera, or still the audio si"ns and video of a V, Video$cassette or even itsweats her video !late has an e%it of com!osed video, &ou can transmit direct of &our com!uter'Pla&in" them in a channel free from the stri! of V()'

These signs can e i%%aiate with a common antenna an ca&tu%e in an it istances o! until aout 00mete%s that it is the most a&&%o&%iate !o% u%an a%eas, %emining that an necessa%y to e a lot o! caution anca%e!ul !o% not inte%!e%ing in !%euencies o! othe% issuing, as well as to eme%gency se%vices' .e&ening on thelocal conitions /e)istence o% not o! ostacles' e with tensions !%om 12 to 1 olts, the ci%cuit has

e)cellent 3 ca%%y out so much in the emission o! monoch%ome signs, as in colo%s' An im&o%tant &oint o! this&%o4ect 5the easiness with that he can e set u& an a4uste, since only two coils a%e use' 3eal to e usewith su%veillance came%as tu%ning the without th%ea'

*s it +orks the tv video and audio transmitter with lm1889n

The hea%t o! this ci%cuit t%ansmitte% 5is the integ%ate ci%cuit L617798 o! 8ational Semiconucto%, thatconsists o! a 6oulato% o! ieo !o% T in an involuc%es o! 17 &ins .3L'

This integ%ate ci%cuit 5use in vieocassettes an vieogames, e)actly to &%ocess the image in!o%mation ansoun, so that they can e &laye in a channel !%ee !%om the st%i& o! '

 As it is com&onent that 5use in comme%cial eui&ments, esies the %eliaility, we have a ce%tain otainingeasiness' The %eae%s, with luc:, until they can !in this availale com&onent in an ol vieogame that it isout o! use, an you ta:e avantage o! it to set u& you% station communita%ian' count all the necessa%y stagesto the &%ocessing o! the vieo signals an auio o! a t%ansmitte% o! signs o! T'

The coil L1 togethe% with the ca&acito% in &a%allel, it gene%ates the sign o! ;, 6< that, moulate with thesoun, it shoul e se&a%ate !%om the ea%e% o! vieo o! this !%euency' Li:e this, the a4ustment that shoulo in this coil it sim&ly consists in you ta:e it to ;, 6<, in way we otain it soun'

The auio moulation 5one y a va%ica& in a ve%y sim&le way, so that the intensity o! the auio sign otainein most o! the e)its o! the soun tale it shoul &%ovie a goo %e&%ouction'

The vieo sign, that otaine 5o! the vieo e)it o! any came%a, vieocassette, .., a&&lie in the &in 1+ o!the ci%cuit integ%ate a!te% going y an am&li!ication stage with two t%ansisto%s'

This sign will moulate in with the vieo ea%e% whose !%euency ce%tain 5!o% L2 an the ca&acito% in &a%allel'

=e shoul a4ust the !%euency o! this oscillato% !o% the channel !%ee !%om the st%i& o! , usually a channelai)o/2 to > in that the %oacasting station will o&e%ate'

The e)it o! ?, otaine in the &in 11 mischievous 5to an am&li!ying stage with a t%ansisto% an o! this !o% theantenna e)&%esses o% a telesco&ic antenna, in case the t%ansmission is o! sho%t %each' Ose%ve that in themoulation o! auio o! this ci%cuit, the sign gene%ates two su&o%tato% eing elow a ;, 6< aove the!%euency o! the channel an othe% ;, 6<'

 As one o! them not eliminate 5, she can cause inte%!e%ences in the a4acent channel' That means that youshoul choose a !%ee channel in you% &lace, ut that oesn@t have a4acent channels o&e%ating'

8/12/2019 transmissor com o LM 1889 (em inglês)

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The &owe% su&&ly o! the ci%cuit can e mae with tensions o! 12 /712 o% 1/71 olts o! a sou%ce with atleast 1A an e)cellent !ilte%' A e!icient !ilte% in this ty&e o! so much ci%cuit can &%ovo:e sno%es in the soun,as unulations in the image'

u""estion of !ower su!!l& for circuit usin" the ic -81.

chematic for assem#l& of the tv transmitter with lm1889n

*ssem#l& of the circuit of the tv transmitter 

The healthy %esisto%s o! 1*7= o% la%ge%' The &owe% sou%ce so much can e the one o! 12*1A, as it can emae a moi!ication to o&e%ate with 1, eing enough !o% that to change the t%ans!o%me% an the integ%ateci%cuit' The ci%cuit &late &%inte !o% the assemly 5shown elow in the illust%ation' The coils, as always, a%e theelements mo%e c%itics o! the &%o4ect' L1 5!o%me y ;0 you e)hale o! th%ea enamele !ine /+0 to +; in a !o%mo! iamete% mm an 17 height mm, with nucleus o! a4ustale !e%%ite' The !o%m !o% this coil can e otainein ol %aios an televisions' The coil L2 that ete%mines the !%euency o! the channel can have !%om 2 to >you e)hale o! th%ea 17 to 22, in use simila% !o%m he% !o% L1' o% 2 o% + you e)hale we will have theo&e%ation in the high channels o! , etween the an the 1+, an !o% ; to > you %eathe the o&e%ation it

will e among the channels 2 an >' o% the ent%ance o! auio an vieo im&o%tant 5to use a%mo%e th%easan a&&%o&%iate connecto%s' o% the antenna to use a connecto% !o% cale o! Ohms' The t%ansmissionsection shoul not e in the same o) that the sou%ce' The t%ansmitte% shoul e shiele !o% la%ge%o&e%ation staility an to avoi the %ece&tion o! noises that a!!ect the t%ansmission' The t%im&ot 1 has !o%

8/12/2019 transmissor com o LM 1889 (em inglês)

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&u%&ose to a4ust to com&onent .C o! the vieo sign, im&o%tant to otain the ma)imum %evenue in thet%ansmission'

*d/ust ali"nment of the video, audio, the coils, antenna and fre0uenc& of the o!eration

To test an to a4ust the t%ansmitte%, call in you% ent%ance the e)its o! auio an vieo o! a vieocassette withany %ion o! goo uality' #se a&&%o&%iate cales' Tie the t%ansmitte% an, in that she inten to o the

o&e%ation' The antenna o! the t%ansmitte% can e a &iece o! some centimete%s o! cove%e common th%ea' A4ust the coil initially L1 so that the sign o! ma)im image intensity is ca&tu%e' A4ustment the way t%im&ot tootain the est image' Then, a4ust slowly the coil L2 until otaining the soun sign' Otaining the sounsign, %etouch the tuning o! way L1 to otain the ma)im t%ansmission' 3! it has i!!iculties in otaining thetuning in the wante channel, alte% the value o! C o% 3 nume% it o! you e)hale o! L1' 3! it has i!!iculties intuning in the soun, alte% C> o% then the nume% o! you e)hale o! L2'

The #oard has dimensions of 11,. % -, cm '

%oven the o&e%ation, ma:e the connection o! the e!initive antenna /it e)&%esses o% it inte%ns an %e-o theway !ittings to otain the est t%ansmission uality' A!te% that, it is only to o&e%ate the station'

L3ST O 6AT(?3AL

8/12/2019 transmissor com o LM 1889 (em inglês)

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Power su!!l&

• C21  712 o% 71 

• 1 4 1n;00; o% euivalent 

• C1 C4  108 

• C5  2200D TO ;00D * 0  

• C6  1008 

• C-  100D + 

• C8  1008 

• 1  Shoc: o! ? 100D * 1 T( 

• T1  T%ans!o%me%, &%ima%y in ag%eement with the net /110*220 an secona%y !%om 17 to 2; * 1A 

• everal   &%inte ci%cuit oa%, th%eas, o), etc' 

Transmitter emiconductors

• Cl1  1889- 3nteg%ate Ci%cuit 6oulato% o! ieo 

•1, ., 4  BC; o% euivalent 

• 3  B.1+ o% euivalent, e)am&le 2n2217 /i!!e%ent inage 

• 1  7789 A?3CA o% euivalent 

esistors 18+, 5:

• 1, 15  72 Ohms- 

• .  120 E Ohms 

• 3  2E Ohms 

• 4  1,2 E Ohms 

• 5, ?1+, ?1; 20 

• 6  ;0 Ohms 

• -  >: Ohms 

• 8  >7: Ohms 

• 9  220 E Ohms 

• 1  2, E Ohms 

• 11, ?1 1 E Ohms 

• 1., ?1>' ?19 10 E Ohms 

• 18  ; Ohms ) 1= 

• .  22 E Ohms 

• P1  10 E Ohms t%im&ot 

Ca!acitors

• C1  ;,D*1 > (L(CT?OLFT3C 

• C., C3  10D*1 > (L(CT?OLFT3C 

• C4, C8  1 n ce%amic 

• C5  120 & ce%amic 

• C6  ; & ce%amic 

• C-  > & o% ; & ce%amic 

everal

• 1, .  Coils L1 0'+D an L2 to 1+D' 

•

;)  it Collies o! 100 D to see te)t' • everal  -&%inte oa% ci%cuit , ent%ance Gacues an out&ut o! signs, o) !o% assemly, &owe%

sou%ce, !o%ms !o% the coils, enamele th%eas, etc'

8/12/2019 transmissor com o LM 1889 (em inglês)

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*TT<=T2>=??The editor doesn@t take the res!onsi#ilit& for the ille"alit& of construction or use of theTransmitter of TV that is descri#ed in this article' The construction and use of the transmitterdescri#ed in this article it can violate federal laws' The readers are informed to o#tain inde!endentinformation, for the !ro!ert&, construction and the use under &our individual condition and /urisdiction of &our countr&'

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