{"id":215,"date":"2011-04-12T15:14:58","date_gmt":"2011-04-12T13:14:58","guid":{"rendered":"http:\/\/www.dainile.lt\/?p=215"},"modified":"2015-11-03T14:08:56","modified_gmt":"2015-11-03T12:08:56","slug":"filtru-charakteristiku-tyrimas-su-lt-spice-iv","status":"publish","type":"post","link":"https:\/\/www.dclabs.lt\/dainiaus\/filtru-charakteristiku-tyrimas-su-lt-spice-iv\/","title":{"rendered":"Filtr\u0173 charakteristikos su LT Spice IV"},"content":{"rendered":"

Viena i\u0161 mano naudojam\u0173 program\u0173 audio filtr\u0173 projektavimui ir tyrimui – LT Spice IV<\/a>. Programa paprasta, nesud\u0117tinga, patogesn\u0117 nei EWB ir kt. Pirma pa\u017eintis su programa buvo kai prisireik\u0117 pasidaryti filtr\u0105 Radiotehnika S90F kolonoms. Gerai gerai, nereikia \u010dia t\u0173 „\u016b\u016b\u016b\u016b\u016b\u016b-\u016b\u016b\u016b\u016b-\u016b\u016b”. Man patinka klasika \ud83d\ude42 Apie filtrus kitam poste, o \u0161itam apie Spice. Pagrindinis langas nesud\u0117tingas:<\/p>\n

\"\"<\/a><\/p>\n

Paspaudus „New Schematics” turim nauja workspeis\u0105 schemai. Tas viskas paprasta – detaliukes renkam vir\u0161uje, nominalas \u012fvedamas spragtel\u0117jus de\u0161iniu pel\u0117s mygtuku and detal\u0117s. Vietoje \u03bc reid\u0117s tinka ir u. \u0160itam reikalui reikalingas \u012ftampos \u0161altinis (Power Suorce), pasirenkam ir pamaigom j\u012f su de\u0161iniu pel\u0117s mygtuku, tuomet „Advanced” mygtukas.<\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

Prie „AC amplitude” para\u0161om, tarkim, 1V ir OK. Kaip ir viskas, turim tokia schemulk\u0105<\/a>:<\/p>\n

\"\"<\/a><\/p>\n

Toliau meniu vir\u0161uje – „Simulate” > „Run”. Atsiradusiame „Edit simulation command” lange lekiam \u012f „AC analysis” tab’\u0105 ir pakeverzojam kelet\u0105 skai\u010diuk\u0173:<\/p>\n

\"\"<\/a><\/p>\n

„Type of sweep” > Tiesinis (Linear)<\/p>\n

„Number of points” > matavimo ta\u0161k\u0173 kiekis. Jei daug o kompas silpnas tai u\u017etruks. Bet tarkim 100 000 jau visai neblogai \ud83d\ude42<\/p>\n

„Start frequency” > nuo kokio da\u017enio matuoti. Garsinio da\u017enio filtrui galima prad\u0117ti nuo 10 Hz.<\/p>\n

„Stop frequency” > iki kokio da\u017enio matuoti. Garsiniam da\u017eniui u\u017etenka 20 KHz (20 000 Hz).<\/p>\n

Sumetam skai\u010diukus ir mygam OK. \u00a0Tada „Simulate” > „Run”. Atsiras tuscias grafikas ir schema. Schemoje reikia bakstel\u0117ti \u012f ta\u0161k\u0105 kuriame reikia matuoti. Gausis ka\u017ekas pana\u0161aus:<\/p>\n

\"\"<\/a><\/p>\n

Pasididinus ir sukult\u016brinus grafik\u0105 gaunasi visai gra\u017eus vaizdelis. Spaud\u017eiam de\u0161in\u012f pel\u0117s mygtuk\u0105 grafiko lange, pasirenkam „Manual limits” ir gaunam gra\u017e\u0173 vaizdel\u012f.<\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

Nu vat ir gra\u017eus grafikiukas. Apie skai\u010diukus – „Left Vertical Axis” 10dB vir\u0161utin\u0117 riba – nes vistiek auk\u0161\u010diau nieko n\u0117ra, „Tick” – \u017eingnis 1dB, apatin\u0117 riba -5 dB. \u00a0Daugiau daryt n\u0117ra reikalo – \u0161iaip ar taip pralaidumo juosta ribojama ties -3dB. -3 dB \u00a0riba naudojama tod\u0117l, kad galia suma\u017e\u0117ja per pus\u0119 prie -3dB lyginant su galia prie 0dB.<\/p>\n

10log10(1\/2) = -3.0103 dB.<\/p>\n

Duotajam pavyzdyje filtro pralaidumo juosta ma\u017edaug nuo 479 Hz iki 5491 Hz – \u0161iame da\u017enyje slopinimas nevir\u0161ija 3dB. Apie antr\u0105 \u017eali\u0105 kreiv\u0119 – v\u0117liau.<\/p>\n","protected":false},"excerpt":{"rendered":"

Viena i\u0161 mano naudojam\u0173 program\u0173 audio filtr\u0173 projektavimui ir tyrimui – LT Spice IV. Programa paprasta, nesud\u0117tinga, patogesn\u0117 nei EWB ir kt. Pirma pa\u017eintis su programa buvo kai prisireik\u0117 pasidaryti filtr\u0105 Radiotehnika S90F kolonoms. Gerai gerai, nereikia \u010dia t\u0173 „\u016b\u016b\u016b\u016b\u016b\u016b-\u016b\u016b\u016b\u016b-\u016b\u016b”. Man patinka klasika \ud83d\ude42 Apie filtrus kitam poste, o \u0161itam apie Spice. Pagrindinis langas nesud\u0117tingas:…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-215","post","type-post","status-publish","format-standard","hentry","category-elektronika"],"_links":{"self":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/comments?post=215"}],"version-history":[{"count":11,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/215\/revisions"}],"predecessor-version":[{"id":2005,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/215\/revisions\/2005"}],"wp:attachment":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/media?parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/categories?post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/tags?post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}