Lub 9V roj teeb puas siv tau rau hauv multimeter thiab txheej txheem calibrator hloov los ntawm 1.5V roj teeb boosted rau 9V?
Kev khiav hauj lwm tam sim no ntawm multimeters thiab cov txheej txheem calibrators feem ntau tsis loj, thiab kev khiav hauj lwm tam sim no ntawm cov digital multimeters feem ntau qis dua 20mA, yog li nws muaj peev xwm siv 1.5V roj teeb qhuav (lossis 1.2V Ni-MH roj teeb) los txhawb qhov voltage. los ntawm lub zog hluav taws xob. voltage hloov lub 9V laminated roj teeb. Cov hauv qab no qhia txog qhov yooj yim thiab yooj yim-rau-ua 1.5V rau 9V voltage regulator Circuit Court, uas tuaj yeem hloov 9V laminated roj teeb siv hauv multimeter.
Nyob rau hauv Circuit Court, lub triode 9013 thiab 8550 tsim ib tug complementary self-excited multivibrator, thiab ob lub raj ua hauj lwm nyob rau hauv lub xeev hloov. T yog ib kauj ruam-up transformer, thiab nws cov thawj kauj yog siv raws li lub collector load ntawm 8550 triode. Tom qab oscillating teeb liab tso zis los ntawm lub collector ntawm lub 8550 yog boosted los ntawm lub transformer T, ib tug high-frequency AC voltage yog generated nyob rau hauv nws thib ob, thiab qhov voltage yog rectified los ntawm Schottky diode 1N5819, C2 filtering thiab voltage regulator VD2, cov zis. ntawm Vout davhlau ya nyob twg yog qhov ruaj khov 9V voltage.
Lub oscillation zaus ntawm qhov Circuit Court no tsuas yog txiav txim siab los ntawm R2 thiab C1. Feem ntau, qhov zaus oscillation tuaj yeem xaiv los ntawm 5 txog 20KHz. Cov zis hluav taws xob ntawm lub zog hluav taws xob yog txiav txim siab los ntawm qhov ntsuas hluav taws xob tus nqi ntawm tus tswj lub raj VD2. Yog tias koj xav tau qhov hluav taws xob ruaj khov ntawm 9V, koj tuaj yeem siv 1N4739 voltage regulator raj nrog tus nqi hluav taws xob ntawm 9.1V thiab lub zog ntawm 1W. Txij li thaum cov zis theem ob ntawm lub transformer yog ib tug high-frequency AC voltage, VD1 yuav tsum siv ib tug switching diode los yog ib tug Schottky diode nrog high-frequency kev ua tau zoo. Capacitor C2 yog qhov zoo dua yog tantalum capacitor nrog kev lim dej zoo. Qhov loj ntawm R3 nyob ntawm qhov voltage hla C2 thiab qhov ua haujlwm tam sim no ntawm multimeter. Piv txwv li ntawm no tias qhov hluav taws xob thoob plaws C2 yog 15V, qhov tam sim no ntws los ntawm VD2 yog 10mA, thiab qhov siab tshaj plaws kev khiav hauj lwm tam sim no ntawm multimeter yog 15mA, ces R3 tuaj yeem yog 240Ω.
ferrite nplhaib.
Cov kauj ruam-up transformer ntawm no Circuit Court tuaj yeem ua los ntawm ferrite sib nqus ib puag ncig. Tus naj npawb ntawm kev tig thiab xaim txoj kab uas hla ntawm lub hauv paus kauj thiab theem nrab kauj yog qhia nyob rau hauv daim duab 1. Lub nplhaib sib nqus ferrite tuaj yeem raug tshem tawm ntawm qee qhov qub hluav taws xob ballasts lossis hloov cov khoom siv hluav taws xob.
Thaum ua, qhov ntawm ob triodes yuav tsum loj li sai tau. Lub hwj chim hloov S hauv Circuit Court tuaj yeem siv lub zog hloov ntawm tus thawj multimeter. Qhov Circuit Court no tuaj yeem siv lub roj teeb No. 5 qhuav lossis 1.2V Ni-MH roj teeb ua lub zog.
