Kapangidwe ndi mfundo yogwirira ntchito ya electret condenser maikolofoni

Lachiwiri Dec 21 21:38:37 CST 2021

Maikolofoni ya Electret imakhala ndi kutembenuka kwamagetsi kwamayimbidwe ndi kutembenuka kwa impedance.Chinthu chofunika kwambiri pa kutembenuka kwa acoustoelectric ndi electret diaphragm.Ndi filimu ya pulasitiki yopyapyala kwambiri, momwe filimu yoyera ya golide imasungunuka kumbali imodzi.Kenako, pambuyo electret wa mkulu voteji magetsi magetsi, pali anisotropic mlandu mbali zonse.Pamwamba pa golide wonyezimira wa diaphragm ndi kunja ndipo amalumikizana ndi chipolopolo chachitsulo.Mbali ina ya diaphragm imasiyanitsidwa ndi mbale yachitsulo ndi mphete yopyapyala yotchinga.Mwanjira imeneyi, capacitance imapangidwa pakati pa filimu yagolide yomwe imatuluka ndi chitsulo.Pamene electret diaphragm ikumana ndi kugwedezeka kwamayimbidwe, gawo lamagetsi pamapeto onse a capacitor limasintha, zomwe zimapangitsa kuti magetsi asinthe amasiyana ndi kusintha kwa mafunde.Mphamvu pakati pa electret diaphragm ndi mbale yachitsulo ndi yaying'ono, nthawi zambiri makumi a PF.Chifukwa chake, mtengo wake wa impedance ndiwokwera kwambiri (XC = 1/2 ~ TFC), pafupifupi makumi a megaohms kapena kupitilira apo.Kusokoneza kwakukulu koteroko sikungafanane mwachindunji ndi amplifier audio.Choncho, mphambano munda zotsatira transistor olumikizidwa mu maikolofoni kwa impedance kutembenuka.FET imadziwika ndi kulowetsedwa kwakukulu komanso phokoso lochepa.FET wamba ili ndi maelekitirodi atatu: ma elekitirodi yogwira (ma), ma elekitirodi a gridi (g) ndi ma elekitirodi okhetsa (d).Apa, FET yapadera yokhala ndi diode ina pakati pa gwero lamkati ndi gridi imagwiritsidwa ntchito.Cholinga cha diode ndikuteteza FET ku zotsatira zamphamvu zamawu.Chipata cha FET chimalumikizidwa ndi mbale yachitsulo.Mwanjira iyi, pali mizere itatu yotulutsa maikolofoni ya electret.Ndiye kuti, gwero la s nthawi zambiri ndi waya wa pulasitiki wa buluu, kukhetsa D nthawi zambiri kumakhala waya wa pulasitiki wofiyira komanso waya wotchinga wolukidwa wolumikiza chipolopolo chachitsulo.