Lesi yisekhethi ye-mini FM transmitter. Ngicabanga ukuthi lokhu kulula kakhulu, kulula futhi kunjalo…kushibhile... I-voltage yokuhlinzeka iphakathi kuka-1.1 – 3 volts futhi ukusetshenziswa kwamandla kungu-1.8 mA ku-1.5 volts. Lo mjikelezo kufanele umbozwe, akunjalo? Ubukhulu bebanga 30 - 50 amamitha. ku-1.5 volts.
i-transmitter circuit
Inzuzo enkulu yalesi sekethi ukuthi umthombo wamandla ibhethri engu-1.5 volt (noma yimuphi usayizi), okuvumela i-PCB nebhethri kugcinwe endaweni ehlangene kakhulu. Isidlulisi singasebenza ngisho namabhethri ajwayelekile e-NiCd aphinde ashajwe, isibonelo ibhethri elingusayizi we-750mAh AA lingasebenza cishe amahora angama-500 (ngenkathi lidonsa i-1.4mA ku-1.24V) elilingana nezinsuku ezingama-20.
I-transistor ayiyona ingxenye ebalulekile yesekethe, kodwa ukukhetha i-transistor ephezulu/yomsindo ophansi kungasiza ukuthuthukisa ikhwalithi yomsindo wesidlulisi kanye nobubanzi. I-PN2222A, 2N2222A, BFxxx series, BC109B, C, kanye ne-BC238 eyaziwa kakhulu isebenza kahle. Isihluthulelo sesekethe esebenza kahle, enamandla aphansi ukusebenzisa i-hFE/low Ceb (i-internal junction capacitance) ama-transistors aphezulu.
Akuwona wonke ama-microphone we-condenser anezici zikagesi ezifanayo, ngakho-ke ngemva kokusebenza kwesekhethi, sebenzisa i-resistor eguquguqukayo engu-10K esikhundleni sika-5.6K, enikezela okwamanje kumakrofoni amplifier yangaphakathi futhi iyilungise endaweni emnandi yomsindo nge-amplitude engcono kakhulu futhi ikhwalithi . Bese uqaphela inani le-resistor eguquguqukayo futhi ubeke esikhundleni saso isiphikisa esigxilile.
Ingxenye ebalulekile i-inductor L okufanele yenziwe ngesandla. Thatha ucezu lwentambo yethusi enoqweqwe oluqinile engu-0.5mm (AWG24) bese usonga ububanzi obuyi-4-5mm ngokukhululeka ube yindilinga. Osayizi bezintambo nabo bangahluka. Umsebenzi osele uncike kakhulu olwazini lwakho nolwazi lwakho ngama-inductors: Faka umsakazo we-FM eduze nesekhethi bese usetha ifrikhwensi lapho kungekho ukwamukela. Faka ugesi kusekethe bese ubeka insimbi ku-loop ye-inductor ukuze unqume inani layo. Uma uthola iphuzu elilungile, lungisa ukuxega kwe-inductor futhi, uma kunesidingo, inani lokujika. Uma yonke into isebenza kahle, ungasebenzisa i-trimmer capacitor ukuze wenze izinguquko ezengeziwe. Kuleli qophelo, ungase ukwazi ukuthola usizo kothile onolwazi. Ungakhohlwa ukuvikela i-inductor ngokumelene namandla angaphandle ngokuthela iglue phezu kwayo. Uma ukwamukela umsakazo kulahleke phakathi kwamamitha ambalwa, lokhu kungase kubangelwe ukulungisa ikhoyili okungalungile futhi empeleni ulalele ukuhambisana kwe-transmitter kunefrikhwensi ephakathi. Susa umsakazo kude nesekhethi bese uyilungisa. Kulula uma wazi ukuthi ungasebenzisa kanjani i-oscilloscope kulesi simo.
Ingxenye ngayinye kufanele ibe lula ukuyifaka ku-PCB engaphansi. Qaphela ukuthi imikhondo ye-transistor kufanele ixhunywe ngendlela efanele. Zama futhi ukuxhuma ingxenye enyakazayo ye-trimmer capacitor ohlangothini lwe-+, lokhu kungasiza ngamashifu amafrikhwensi angafuneki lapho ushuna. Umdwebo we-PCB kufanele uphrintwe kokuthi 300DPI, futhi ifayela le-TIFF limisiwe lapha.
I-Mini FM Transmitter PCB Isakhiwo:
i-transmitter circuit
idatha Technical:
Amandla kagesi: 1.1 - 3 volts
Ukusetshenziswa kwamandla: 1.8 mA ku-1.5 volts
Ububanzi: kufika ku-30 m. ku-1.5 volts
i-transmitter circuit
