Ngwakọta na ụkpụrụ ọrụ nke igwe okwu electret condenser

Tuz 21 21:38:37 CST 2021

Igwe igwe eletret nwere ntụgharị ọkụ eletrik na-eme mkpọtụ na ngbanwe impedance.Isi ihe dị na ntụgharị acoustoelectric bụ electret diaphragm.Ọ bụ ihe nkiri plastik dị gịrịgịrị, nke a na-ekpochapụ akwa ihe nkiri ọla edo dị ọcha n'otu akụkụ.Mgbe ahụ, mgbe electret nke eletrik eletrik dị elu, enwere ụgwọ anisotropic n'akụkụ abụọ.Elu ọla edo ekpochapụla nke diaphragm dị n'èzí ma jikọta ya na shei igwe.A na-ekewa akụkụ nke ọzọ nke diaphragm na efere ígwè site na mgbanaka mkpuchi mkpuchi dị mkpa.N'ụzọ dị otú a, a na-emepụta capacitance n'etiti ihe nkiri ọla edo na-ekpochapụ na efere ígwè.Mgbe electret diaphragm na-ezute ịma jijiji ụda, ọkụ eletrik na nsọtụ abụọ nke capacitor na-agbanwe, na-ebute voltaji ọzọ na-agbanwe agbanwe na mgbanwe nke ụda ụda.Ike dị n'etiti diaphragm electret na efere ígwè dị ntakịrị, n'ozuzu iri puku kwuru iri PF.Ya mere, uru impedance mmepụta ya dị oke elu (XC = 1/2 ~ TFC), ihe dị ka iri megaohms ma ọ bụ karịa.Enweghi ike ijikọ ihe mgbochi dị elu dị otú ahụ na igwe nkwuputa ọdịyo.Ya mere, a na-ejikọta transistor mmetụta ubi junction n'ime igwe okwu maka ntụgharị impedance.Eji mara FET site na ntinye ntinye dị elu na ọnụ ọgụgụ mkpọtụ dị ala.FET nkịtị nwere electrodes atọ: electrode nọ n'ọrụ (s), grid electrode (g) na drain electrode (d).N'ebe a, a na-eji FET pụrụ iche nwere diode ọzọ n'etiti isi mmalite na grid.Ebumnuche nke diode bụ iji chebe FET site na mmetụta mgbaàmà siri ike.A na-ejikọta ọnụ ụzọ ámá nke FET na efere ígwè.N'ụzọ dị otú a, e nwere atọ mmepụta ahịrị nke electret igwe.Ya bụ, isi iyi s bụ waya rọba na-acha anụnụ anụnụ, drain D bụ waya plastik na-acha uhie uhie na waya mkpuchi mkpuchi na-ejikọta shea ọla.