Wannan karamin da'irar watsa FM ce. Ina tsammanin wannan shine mafi sauƙi, mafi sauƙi kuma ba shakka… arha… Wutar lantarki yana tsakanin 1.1 - 3 volts kuma yawan wutar lantarki shine 1.8 mA a 1.5 volts. Ya kamata a rufe wannan da'irar, daidai? Matsakaicin iyaka 30 - 50 mita. da 1.5 volt.
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Babban fa'idar wannan da'irar ita ce tushen wutar lantarki baturi ne na 1.5 volt (na kowane girman), yana ba da damar PCB da baturi a riƙe a cikin ƙaramin wuri. Mai watsawa na iya yin aiki akan daidaitattun batura masu caji na NiCd, misali girman baturin 750mAh AA na iya aiki na kusan awanni 500 (yayin da yake jan 1.4mA a 1.24V) wanda yayi daidai da kwanaki 20.
Transistor ba wani yanki ne mai mahimmanci na kewaye ba, amma zabar babban mitar / ƙaramar amo na iya taimakawa inganta ingancin sautin mai watsawa da kewayon. PN2222A, 2N2222A, jerin BFxxx, BC109B, C, har ma da sanannun BC238 suna aiki daidai. Makullin aiki mai kyau, da'ira mara ƙarfi shine a yi amfani da transistor masu ƙarfi hFE/low Ceb (internal junction capacitance).
Ba duk microphones na condenser suna da halayen lantarki iri ɗaya ba, don haka bayan yin aiki da da'ira, yi amfani da resistor mai canzawa na 10K maimakon 5.6K, wanda ke ba da na yanzu zuwa maƙallan ciki na microphone kuma yana daidaita shi zuwa wuri mai daɗi don sauti tare da mafi kyawun amplitude kuma inganci . Sa'an nan kuma lura da darajar variable resistor kuma musanya shi da tsayayyen resistor.
Babban sashin shine inductor L wanda yakamata ayi da hannu. Ɗauki wani yanki na 0.5mm (AWG24) enameled waya ta tagulla kuma kunsa diamita 4-5mm guda biyu a hankali a cikin da'irar. Girman waya kuma na iya bambanta. Sauran aikin ya dogara da ilimin ku da matakin gogewa tare da inductor: Sanya rediyon FM kusa da kewaye kuma saita mitar inda babu liyafar. Aiwatar da wutar lantarki zuwa kewaye kuma sanya sandar ƙarfe a cikin madaukin inductor don tantance ƙimarsa. Lokacin da ka sami madaidaicin batu, daidaita sassaucin inductor kuma, idan ya cancanta, adadin juyawa. Da zarar komai yana aiki lafiya, zaku iya amfani da capacitor na trimmer don yin ƙarin gyare-gyaren mita. A wannan lokaci, za ku iya samun taimako daga wani mai gwaninta. Kar a manta da kiyaye inductor a kan sojojin waje ta hanyar zuba dan kadan a kai. Idan liyafar rediyo ta ɓace a cikin ƴan mita, wannan na iya faruwa ta hanyar daidaitawar coil ɗin da ba daidai ba kuma a zahiri kuna sauraron jituwar mai watsawa maimakon mitar ta tsakiya. Matsar da rediyo daga kewaye kuma gyara shi. Yana da sauƙi idan kun san yadda ake amfani da oscilloscope a cikin wannan yanayin.
Kowane bangare yakamata ya zama mai sauƙin shigarwa akan PCB da ke ƙasa. Lura cewa ya kamata a haɗa jagororin transistor daidai. Hakanan gwada haɗa ɓangaren motsi na capacitor trimmer zuwa gefen +, wannan na iya taimakawa tare da sauye-sauyen mitar da ba'a so lokacin kunnawa. Ya kamata a buga hoton PCB a 300DPI, kuma an saita fayil ɗin TIFF anan.
Tsarin PCB Mini Mai watsa FM:
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Bayanan fasaha:
Ƙarfin wutar lantarki: 1.1 - 3 volts
Amfanin wutar lantarki: 1.8mA a 1.5 volts
Nisa: har zuwa mita 30. da 1.5 volt
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