Distinguishing triode electrodes thiab raj hom
(1) Kev tshuaj xyuas qhov muag pom
① Kev txheeb xyuas ntawm hom raj
Feem ntau, seb hom raj yog NPN lossis PNP yuav tsum raug txheeb xyuas los ntawm tus qauv naj npawb cim rau ntawm lub plhaub raj. Raws li kev cai lij choj, tus lej thib ob (tsab ntawv) ntawm tus qauv triode, A thiab C sawv cev rau PNP hlab, B thiab D sawv cev rau NPN raj, piv txwv li:
3AX yog PNP hom low-frequency low-power tube. 3BX yog NPN-hom low-frequency low-power raj.
3CG yog PNP hom siab zaus qis zog raj. 3DG yog NPN hom siab zaus qis zog raj.
3AD yog PNP hom low-frequency high-power raj. 3DD yog NPN-hom low-frequency high-power raj.
3CA yog PNP hom high-frequency high-power raj. 3DA yog NPN-hom high-frequency high-power raj.
Tsis tas li ntawd, muaj thoob ntiaj teb nrov 9011 ~ 9018 series high-frequency low-power tubes. Tsuas yog 9012 thiab 9015, uas yog PNP raj, qhov seem yog NPN-hom raj.
② Kev txheeb xyuas cov raj
Feem ntau siv me me thiab nruab nrab-lub zog transistors muaj cov duab xws li hlau cylindrical plhaub thiab cov pob yas (ib nrab-lub tog raj kheej hom). Daim duab T305 qhia txog peb cov duab thiab cov kev npaj raj.
(2) Siv qhov kev tiv thaiv ntau yam ntawm ib lub multimeter los txiav txim
Muaj ob PN junctions nyob rau hauv lub transistor. Koj tuaj yeem siv qhov kev tawm tsam ntawm ib qho multimeter kom paub qhov txawv ntawm peb tus ncej e, b, thiab c. Txoj kev no tseem tuaj yeem siv los txheeb xyuas lub raj hom thaum daim ntawv lo qauv tsis meej.
① Kev txheeb xyuas ntawm lub hauv paus
Thaum txiav txim lub raj, koj yuav tsum xub paub meej tias lub hauv paus. Rau lub raj NPN, siv cov hlau kuaj dub los txuas rau lub hauv paus uas xav tau, thiab siv cov xim liab coj los kov lwm ob tus ncej. Yog tias qhov ntsuas tsis kam me me, nws yuav yog li ob peb puas mus rau ob peb txhiab ohms; thiab sib pauv qhov kev xeem dub thiab liab ua rau kev ntsuas Cov kev tawm tsam yog tag nrho cov loj, saum toj no ntau pua kiloohms. Nyob rau lub sijhawm no, cov hlau kuaj dub txuas nrog lub hauv paus. Rau PNP raj, qhov xwm txheej yog qhov sib txawv. Thaum ob qho tib si PN junctions yog rau pem hauv ntej kev tsis ncaj ncees thaum ntsuas, cov hlau kuaj liab txuas nrog lub hauv paus.
Qhov tseeb, lub hauv paus ntawm lub raj qis qis feem ntau yog teem rau hauv nruab nrab ntawm peb tus pins. Koj tuaj yeem siv cov txheej txheem saum toj no los txuas cov kev sim dub thiab liab ua rau lub hauv paus feem, uas tuaj yeem txiav txim siab seb ob lub PN junctions ntawm triode puas lawm (thiab PN hlws ris ntawm lub diode). Txoj kev ntsuas yog tib yam), thiab hom raj tuaj yeem lees paub.
② Kev ntxub ntxaug ntawm cov neeg sau thiab cov emitter
Tom qab txiav txim siab lub hauv paus, xav tias ib qho ntawm cov pins ntxiv yog tus sau c thiab lwm tus yog tus emitter e. Siv koj tus ntiv tes los tuav lub c thiab b electrodes raws li (uas yog, siv koj cov ntiv tes los hloov lub hauv paus resistor Rb). Nyob rau tib lub sijhawm, hu rau ob qhov kev xeem coj ntawm multimeter nrog c thiab e raws. Yog hais tias lub raj nyob rau hauv kev xeem yog NPN, siv cov dub xeem coj mus kov lub c ncej thiab cov liab xeem coj mus rau lub e ncej (tawm tsam rau lub PNP raj), thiab saib lub deflection lub kaum sab xis ntawm lub pointer; ces teem dua tus pin yog c ncej. Rov ua cov txheej txheem saum toj no thiab sib piv cov kaum sab xis ntawm ob qhov ntsuas ntsuas. Qhov loj dua qhia tias IC loj dua thiab lub raj yog nyob rau hauv lub xeev amplified. Qhov sib thooj assumed c thiab e ncej yog lawm.
