- Xanh da trai, xanh la, den, nhO vang.
B. Nell nguyen tt.c h09-t 69n9 clla Tiristor, Diac, Triac, Varistor.
Chuang 2
_ A A }
KY THU~T MACH DIJ;lN TV
I. KHAI NIIlM MACH KHUficH DAI
1. £)!nh nghla
Trang ky thu(lt di~n til. khuech dqi tfn hi~u ill van de lu6n d~t fa va nIt co
y nghia.
Mqch /,:/lI{cc'/t cll}i till hifll hi m(jf 11l(IC/J difn fir C() khd nelllg hilll defi m~)f tin
lIi¢// e(1 hiell d(j II//{) rf (Mil WID !hdl/II fin hifU co hien d() IOn d eMu ra md d{/lIg lin "i~;1I (hdll ('/ui( lll1l1i('/I) kl/()lIg 1110.'.' ddi.
Thl!c chtl! khucch d~li li'l m¢t qua trlnh bien deli nang luqng c6 dieu khiEn, ('1
d6 nang luqng ella nguon cung cap tnQ! chieu du{}c bien d6i thanh nang luqng eua tin hi~u thea quy lu~t ella tfn hi¢u dieu khi~n.
2. Ph.n lo~i m~ch khuech d~i
Ngu(1j ta chia cae m.,leh khuech d1).i ra nhieu IO<:,-i theo nhieu (ieu chulin
khac nhaLl:
* Theo dano . c . tin hieu can khucch dai . c oom:
~ M'.ICh khucch d',li tfn hieu lien tlJ.c.
- M'.ICh khuech d~i tin hi¢u xung.
+ M{lch klwi/el, d{li ffll hi¢u lien ".Ie dung de khu~ch d'.li cae tin hi~u bien d6i lien tl,lC thea thai gian. ThU'ang duQ'C sit dy.ng trong b¢ khuech d'.li micfo,
khuech d'.li am thanh.
+ M~ICh klu/(''cI, d{ti ffll hicJlI xI/JIg dung d~ khu~ch d'.li cac tin hi~u fai f;,tC thea thai gian. Thuang dUQ'c su dy.ng trong de thief bi rada, may thu hlnh, cae thiel bi tfnh locin, dicu khi0n ...
Phan lam 4 Io<.ti:
- M<;lch khuech d~i tin hi~u m¢t chi~u ( f = 0 va tan so rat thap).
- M'.lch khuech d'.li tfn hi¢u xoay chicu tan so thap ( f= 16Hz d€n 20 KHz). - M<Jch khucch d,~i tin hi~u xoay chieu tan s6 cao ( f> 20 KHz).
- M,~ch khuech ct,)i lin hi¢u m¢t chicu va xoay chicu. *Thco d~c tuyen t<'in s6:
Phfm lam 3 lo~~i:
- Mach khuech dai conn hwyn'y,
. . . 0 0
- MiJch khuech dt.ti diU ht;p. - M,-~ch khuech d'-.Ii dtii !"(:lng.
+ M(wh klllle'c/i d(li C()llg IllroJlg la m,!ch e6 h9 56 khuech d<;li d~t gia tri Ion nhat t,~i tan so c(:lng huang.
+ M(ICh kJllu/ch d~li ddi fcill I/{;p iu miJch c6 h¢ s6 khuech d'.li khong thay dbi trong mllt dui tan s6 hl;!p va suy gi{lm ro r~t a ngoai dai tan 56 do.
+ M(lth klilltell d~ii tldi /"()lIg: M~ch co dai tan 13m vi¢e co vai ehl;lc MHz. * Theo cae phan tl( khueeh d~li gam:
-M~eh khucch d~i dung den di~n IiI. - M<Jeh khuech d,~i dung Tranzito. - M~ch khuech d<).i dung IC
- M<).ch khuech diJi dung diN TUNEN.
TfOng thifc te con nhieu cach phan io~i khae nhu theo d<;li luqng can khu€ch d<).i (khucch d'.li dong dit?n, khucch di.~i di¢n ap, khuech d<;li cong suiit), thee each mac phan til khuech d<'.li, theo cac m<).ch ghep tang ... rna chung ta se tIm hi6u ky
a phan sau.