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Simulator-programi i modeli...
#75
(04-10-2016, 09:04 AM)vulejov Wrote: Не знам да ли је онда логично да покаже мања изобличења када је стартно време 100ms у односу на рецимо 1s..
Такође, приметио сам да симулација из поста 49 повећа изобличења 10-20 пута када се звучник од 8 замени са 4-омским.. ако је веровати симулацији то баш и није добра особина, исто као и значајно повећање изобличења на високим фреквенцијама..
У реалности не постоји звучник од 8 ома, већина се врзма између 4 и 6, неки се спусте и ниже..

Vrednosti izobličenja u tranzijentnom režimu nisu od značaja, u njima postoje i elementi slučajnosti, tako da ih ne vredi tumačiti.
O merodavnim vrednostima THD možemo govoriti tek kada je simulacioni sistem u stacionarnom režimu, što se može proveriti tako što se uporede rezultati sa različitim startnim vremenima i tek kada prestanu da se menjaju (dva zadnja su ista), onda ih možemo usvojiti.
Na primer, u softverima na kojima sam radio i još uvek radim (simulacija motora SUS) smatra se da je dostignuto stacionarno stanje kada u zadnja dva do četiri obrtaja imamo promene u ključnim rezultatima samo unutar zadatog tolerancijskog polja.

Povećanje izobličenja pri smanjenoj impedansi opterećenja je takodje karakteristično kod pojačavača snage klase AB i B, kao i kod opampova. Medjutim, faktor od 10 do 20 se i meni čini previsokim, mada ne i nemogućim.
Na primer, kod pojačala Elektor Q-Watt, za koje postoje iscrpni merni rezultati, razlika izmedju THD na 1kHZ pri opterećenju od 4 i 8R je 0,0009% prema 0,0006% (snaga od 100W na 4R, odn. 50W na 8R, tj. pri istom izlaznom naponu).

Što se tiče porasta izobličenja sa frekvencijom, i to je uobičajena pojava kod klase AB i B, v. na primer Self-ov "Blameless amplifier):

http://www.signaltransfer.freeuk.com/compact.htm

Pozdrav
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Messages In This Thread
RE: Simulator-programi i modeli... - by TDA - 08-11-2014, 06:31 PM
RE: Simulator-programi i modeli... - by mikikg - 08-11-2014, 07:32 PM
RE: Simulator-programi i modeli... - by TDA - 08-11-2014, 07:54 PM
RE: Simulator-programi i modeli... - by mikikg - 08-11-2014, 09:04 PM
RE: Simulator-programi i modeli... - by samuki - 08-11-2014, 10:37 PM
RE: Simulator-programi i modeli... - by samuki - 08-12-2014, 11:08 PM
RE: Simulator-programi i modeli... - by Dragan100 - 08-11-2014, 10:37 PM
RE: Simulator-programi i modeli... - by TDA - 08-11-2014, 11:00 PM
RE: Simulator-programi i modeli... - by Dragan100 - 08-11-2014, 11:16 PM
RE: Simulator-programi i modeli... - by Braca - 08-12-2014, 09:36 AM
RE: Simulator-programi i modeli... - by Dragan100 - 08-12-2014, 12:23 PM
RE: Simulator-programi i modeli... - by Braca - 08-12-2014, 01:25 PM
RE: Simulator-programi i modeli... - by Dragan100 - 08-12-2014, 01:30 PM
RE: Simulator-programi i modeli... - by TDA - 08-12-2014, 01:11 PM
RE: Simulator-programi i modeli... - by Braca - 08-12-2014, 01:39 PM
RE: Simulator-programi i modeli... - by TDA - 08-15-2014, 06:18 PM
RE: Simulator-programi i modeli... - by Braca - 12-08-2014, 07:53 PM
RE: Simulator-programi i modeli... - by Braca - 12-21-2014, 09:27 PM
RE: Simulator-programi i modeli... - by TDA - 12-21-2014, 10:10 PM
RE: Simulator-programi i modeli... - by Braca - 12-21-2014, 10:29 PM
RE: Simulator-programi i modeli... - by samuki - 12-21-2014, 11:05 PM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 12:13 AM
RE: Simulator-programi i modeli... - by Aca93 - 12-21-2014, 11:06 PM
RE: Simulator-programi i modeli... - by dlalkovic - 12-22-2014, 09:27 PM
RE: Simulator-programi i modeli... - by Braca - 12-21-2014, 11:43 PM
RE: Simulator-programi i modeli... - by Aca93 - 12-22-2014, 12:18 AM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 12:44 AM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 08:10 PM
RE: Simulator-programi i modeli... - by samuki - 12-22-2014, 08:23 PM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 09:28 PM
RE: Simulator-programi i modeli... - by Dragan100 - 12-23-2014, 10:10 AM
RE: Simulator-programi i modeli... - by Braca - 12-23-2014, 11:16 AM
RE: Simulator-programi i modeli... - by Dragan100 - 12-23-2014, 10:15 AM
RE: Simulator-programi i modeli... - by Dragan100 - 12-23-2014, 03:55 PM
RE: Simulator-programi i modeli... - by Dragan100 - 12-24-2014, 09:01 AM
RE: Simulator-programi i modeli... - by Dragan100 - 03-04-2016, 04:53 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-05-2016, 10:57 PM
RE: Simulator-programi i modeli... - by vulejov - 03-06-2016, 08:46 AM
RE: Simulator-programi i modeli... - by vulejov - 03-06-2016, 04:30 PM
RE: Simulator-programi i modeli... - by Braca - 03-06-2016, 11:05 AM
RE: Simulator-programi i modeli... - by Dragan100 - 03-06-2016, 06:52 PM
RE: Simulator-programi i modeli... - by vulejov - 03-06-2016, 09:57 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-06-2016, 10:24 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-08-2016, 05:11 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-08-2016, 06:39 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-11-2016, 03:35 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-11-2016, 04:00 PM
RE: Simulator-programi i modeli... - by vulejov - 03-23-2016, 08:16 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-23-2016, 08:48 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 12:26 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 03:09 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 06:32 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 08:12 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 08:48 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 09:13 PM
RE: Simulator-programi i modeli... - by Braca - 04-09-2016, 11:26 PM
RE: Simulator-programi i modeli... - by vulejov - 04-10-2016, 09:04 AM
RE: Simulator-programi i modeli... - by Braca - 04-10-2016, 10:20 AM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 09:56 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 09:24 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 09:29 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-10-2016, 12:53 PM
RE: Simulator-programi i modeli... - by vulejov - 04-10-2016, 01:15 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-10-2016, 06:37 PM
RE: Simulator-programi i modeli... - by vulejov - 04-10-2016, 08:48 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-10-2016, 10:58 PM
RE: Simulator-programi i modeli... - by vulejov - 04-11-2016, 05:27 AM
RE: Simulator-programi i modeli... - by Dragan100 - 04-11-2016, 11:28 AM
RE: Simulator-programi i modeli... - by vulejov - 04-11-2016, 02:52 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-11-2016, 06:47 PM
RE: Simulator-programi i modeli... - by vulejov - 04-11-2016, 09:02 PM
RE: Simulator-programi i modeli... - by Braca - 04-12-2016, 09:17 PM
RE: Simulator-programi i modeli... - by vulejov - 04-13-2016, 07:17 AM
RE: Simulator-programi i modeli... - by mikikg - 04-13-2016, 08:35 AM
RE: Simulator-programi i modeli... - by mikikg - 04-15-2016, 10:29 PM
RE: Simulator-programi i modeli... - by Robert63 - 04-15-2016, 10:52 PM
RE: Simulator-programi i modeli... - by Leonardo - 11-24-2016, 08:43 AM
RE: Simulator-programi i modeli... - by vsavic - 01-02-2017, 12:48 AM
RE: Simulator-programi i modeli... - by Braca - 08-02-2019, 10:58 PM
RE: Simulator-programi i modeli... - by Braca - 08-03-2019, 11:45 AM
RE: Simulator-programi i modeli... - by Dragan100 - 08-03-2019, 12:12 PM
RE: Simulator-programi i modeli... - by Braca - 08-04-2019, 08:59 AM
RE: Simulator-programi i modeli... - by Braca - 01-20-2020, 09:24 AM
Simulator-programi i modeli... - by mikikg - 05-31-2013, 06:09 AM
Simulator-programi i modeli... - by mikikg - 05-31-2013, 09:13 AM

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