Halabuurka iyo mabda'a shaqada ee makarafoonka kondenseriyaha electret

Talaado Diseembar 21 21:38:37 CST 2021

Makarafoonka Electret waxa uu ka kooban yahay cod beddelka koronto iyo beddelidda impedance.Waxyaabaha ugu muhiimsan ee beddelka acoustoelectric waa electret diaphragm.Waa filim caag ah oo aad u dhuuban, kaas oo lakabka filimka dahabka ah ee saafiga ah uu hal dhinac ka soo baxayo.Kadib, ka dib korantada beerta korantada ee tamarta sare, waxaa jira kharashyo anisotropic ah labada dhinac.Dusha sare ee dahabka ee uumi-baxa ee diaphragm waa bannaanka waxayna ku xiran tahay qolofka birta ah.Dhinaca kale ee diaphragm-ka waxaa ka soocaya saxanadda birta iyadoo la raacayo giraan dahaar khafiif ah.Sidan oo kale, capacitance ayaa la sameeyaa inta u dhaxaysa filimka dahabiga ah ee la uumi baxay iyo saxanka birta ah.Marka diaphragm-ka electret uu la kulmo gariir dhawaaqa ah, goobta korantada ee labada daraf ee capacitor-ku way isbedeshaa, taasoo keentay danab beddelan oo ku kala duwan isbedelka hirarka dhawaaqa.Awoodda u dhaxaysa diaphragm electret iyo saxanka birta waa mid yar, guud ahaan tobanaan PF.Sidaa darteed, qiimaheeda wax-soo-saarku aad ayuu u sarreeyaa (XC = 1/2 ~ TFC), qiyaastii tobanaan megaohms ama ka badan.Cidhiidhiga sare ee noocan oo kale ah si toos ah uma dhigmi karo cod-weyneeye.Sidaa darteed, transistor-ka saamaynta goobta is-goysku wuxuu ku xidhan yahay makarafoonka si loogu beddelo impedance.FET waxaa lagu gartaa caqabad sare oo wax gelin ah iyo sawirka qaylada hoose.FET-ga caadiga ah waxa uu leeyahay saddex koroono: korantada firfircoon (s), kolaydhka korantada (g) iyo dareeraha dareeraha (d).Halkan, FET gaar ah oo leh diode kale oo u dhexeeya isha gudaha iyo shabagga ayaa la isticmaalaa.Ujeedada diode-ku waa in laga ilaaliyo FET-ka saameynta calaamadda xooggan.Albaabka FET wuxuu ku xiran yahay saxan bir ah.Sidan, waxaa jira saddex xariiq oo wax soo saarka ee makarafoonka electret.Taasi waa, isha s guud ahaan waa silig balaastig ah oo buluug ah, qulqulka D guud ahaan waa silig caag ah oo cas iyo siliga gaashaanka tidcan ee isku xira qolofka birta ah.