Amateur radio Manual Beginner sika: kanjani ukuhlola FET

FETs - amadivayisi Semiconductor, lapho transients control, kanye ubukhulu wamanje okukhipha ngokushintsha emkhakheni kagesi. Kunezinhlobo ezimbili zama lezi amadivaysi: nge esangweni ukushisa namakhaza (bazabela ihlukaniswe transistors nge esakhelwe wesiteshi lokungeniswa isiteshi) nokuphatha ushintsho. FETs ngenxa izici zayo eyingqayizivele kabanzi zikagesi: amandla kagesi, amathelevishini, amakhompyutha, njll

Lapho silungisa izinto ezinjalo ngokuqinisekile zonke radio amateur saqala sibhekene nenselele: kanjani ukuhlola FET? Ezimweni eziningi, yokuqinisekisa izici eziningana ezinjengolwazi kungenzeka nazo lapho silungisa pulsed segezi. Kulesi sihloko thina ukuyichaza ngokuningiliziwe indlela ukukwenza kahle.

Indlela hlola ohmmeter FET

Okokuqala, ukuqala ukuhlolwa kwe-FET, kubalulekile ukubhekana naso "pinout", ie nge izikhonkwane indawo. Kuze kube manje, kukhona izinguqulo eziningi ezehlukene ebese ezifana, ngokulandelana, indawo electrode ehlukile. Ngokuvamile, uyakwazi ukuthola Semiconductor transistors nabantu oxhumana nabo ngemvume. Ukuze wokugubha ukusetshenziswa izinhlamvu Latin G, D, S. Uma isignesha alikho, kubalulekile ukusebenzisa izincwadi.

Ngakho, lungisa nekukumakwa oxhumana nabo, sixoxe ngezindlela esingasiza ngazo hlola FET. Isinyathelo esilandelayo ukuze sithathe izinyathelo ezidingekile ukuphepha, ngoba amadivayisi ensimini kakhulu sensitive zikagesi, futhi ukuvimbela ukwehluleka isici esinjalo, kubalulekile ukuba uhlele phansi. Ukuze suka anqwabelene icala static, ngokuvamile igqoke esihlakaleni anti-static phansi ibhande.

Akufanele sibakhohlwe ukuthi udinga ukugcina FETs iziphetho avaliwe. Ukususa zikagesi, ungakwazi ukuqhubeka ukuqinisekisa inqubo. Lokhu kuzodinga imitha elula Ohm. Ngezinye isici serviceable phakathi zonke iziphetho ukumelana okufanele uhambe infinity, kodwa kukhona ezinye okuhlukile. Manje sibheka indlela uhlole Transistor ensimini umphumela n-hlobo.

Sisebenzisa idivayisi omuhle probe esangweni electrode (G), futhi probe negative ukuxhumana umthombo (S). Kuleli qophelo, iqala ukushaja capacitance esangweni futhi element liyavuleka. Lapho yokulinganisa ukumelana phakathi omthombo abakhwabanisi (D) ohmmeter ukukhombisa inani elithile ukumelana. Tinhlobo letehlukene transistors, lesi silinganiso lihlukile. Uma isekhethi Transistor ezikhumulweni, ukumelana phakathi abakhwabanisi kanye lomthombo futhi bathambekele okufanekisa ingunaphakade. Uma kungaqali, kusho ukuthi Transistor ayilungile.

Uma ucela kanjani ukuhlola FET P-hlobo, impendulo ilula: usuphinda ngenhla kushintsha polarity kuphela. Akufanele sibakhohlwe ukuthi yesimanje amandla FET phakathi omthombo abakhwabanisi abe diode umzimba, ngokulandelana, "prozvanivatsya" isiqondiso kuyo eyodwa kuphela.

Hlola FET multimeter

Ephambi kwezinduna idivayisi "DMM", ungabheka-FET. Ukuze wenze lokhu, sidalula imitha ukuba "embili" Imodi diodes futhi ukwethula i-elementi zasendle imodi ukugcwaliswa. Uma N-uhlobo Transistor, probe lokususa uthinte abakhwabanisi kanye omuhle - yokucina. Transistor onesici Kulezo zimo ivulekile. Thina uthumele probe plus ngaphandle kokuthatha lokususa, ngomthombo, kanye multimeter ubonisa inani elithile ukumelana. Ngemva kwalokho off Transistor: ngaphandle oqeda lokuloba emthonjeni, lokususa uthinte yokushutha bese ubuyela abakhwabanisi. Transistor amabhlogo nokuzabalazela ivame infinity.

nayizimfundamakhwela Abaningi umsakazo ucelwa: "Kungenzeka kanjani ukuthi ngibe hlola FET, hhayi vypaivaya" Ngokushesha phendula ngaleyo ndlela akukho amaphesenti ayikhulu. Ukuze wenze lokhu, sebenzisa block multimeter ka HFE, kodwa le ndlela ngokuvamile ehluleka, futhi ungakwazi ukuchitha isikhathi esiningi esichithekayo.