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[split] LME49810 + EF Amp -zaštita
#15
(08-31-2014, 02:01 PM)11277 Wrote: pajser zaštita je najefektnija na klemama zvučnih kutija,jer tu zapravo najdirektnije štiti same zvučnike od već pregorjelog pojačala. jeste da struju krakog spoja u tom slučaju trpi i sam zvučnički kabel ali jedna pajser zaštita je tu za svako pojačalo koje se na zvučnike spaja. moj primjerak sa mosfetima se uključuje i isljučuje bez ikakvih TUP i pajser joj je skroz primjerena zaštita. već sam napravio NE555 i ona će ostati,a R.S. vidjeću kako i koliko ću koristiti.

buca33Confusedvaki strujni krug koji se zatvara u tvom gore slučaju preko R5 invertujući ulaz će vidjeti kao grešku,pisao sam o tome jedno x puta nakon što mi je sam Macola dao amin na razmišljanje još prvi put kad mi je izgorjeo 47R na BatoMM.

Tako je,

".... invertujući ulaz će vidjeti kao grešku",
pa da, tako i NFB radi. Odlično napisano @11277!!!

----------------------------------------------

Ali pogledajmo onu modificiranu RS sliku:

1.Normalni rad,
u tački gdje se spajaju R4, R5 i R6 sumiraju se signali iz izlaza preko R6 560R
i iz zvučniških klema preko R5 15R + R_zvučniškog kabla (jedna polovina kabla - jedna žica), otpornost RS veze zanemarimo!

Naravno prevladače signal preko R5 ali i signal preko R6 je tu prisutan.
NFB "vidi" izlaz udaljen kao R4 + (R6//(R5+R_zvuč.kabla)), izlaz nam je u ovom primeru klema zvučnika, gdje NFB dobia podatke o nastaloj greški.
NFB sumira greške na INV IN uporedbom sa signalom na NON-INV IN


2.Abnormalni rad - zvučniški kabal se nam je otkinuo (na pojačalu ili na zvučnicima, svejedno), RS priključen i funkcionalan:

Sada nam izlaz predstavlja baš tačka gdje se spajaju R4, R5 i R6.

Izlaz pojačala ima dodatnu unutrašnju otpornost R6, koju NFB pokušava kompenzirati,
zvučniški kabal nam je sada R5 +R_rs, naravno sada stupi na snagu i otpornost RS veze do zvučnika, sada tu teku veče struje nego kod normalnog rada,
dodaje se i taj pad napona.

NFB i dalje odlično radi, kompenzira "ugurani" otpor u izlazu,
zvučnik sada vidi pojačalo 15R daleko, RS postaje zvučniški kabal,
do nekih par wata snage sve štima, jedino se nam je sistem malo stišao.

Kod večih snaga več R6 560R preuzima na sebe veliki pad napona, i limiter nam je za veče struje,
NFB svejedno pokušava kompenzirati tu razliku, i pojačalo nam ide prema NAPONSKOM klippingu,
jer smo ograničeni naponom napajanja samog pojačala.
Pojačalo če i dalje tako raditi u klippingu bez bojazni na havariju,
jer smo izlaznu struju limitirali tim uguranim R6,
toplotna disipacija izlaza je mala, tako da smo duboko ispod SOA margine

Zvučniku pak dolaze paketi jednosmerne snage, ali takodjer su strujno limitirani, pa ne predstavljaju nikakve probleme.

Kako se tada čuje naš sistem...NIKAKO,
ali radio bi tako bez poteškoča na MAX ulaznog signala pojačala još dalje....


LP
Dragan
LP
Dragan
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Messages In This Thread
[split] LME49810 + EF Amp -zaštita - by TDA - 08-29-2014, 10:52 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 12-20-2014, 10:35 AM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 12-20-2014, 11:04 AM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 12-20-2014, 03:20 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 12-21-2014, 12:44 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 11-11-2015, 11:45 AM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 11-11-2015, 12:13 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 11-11-2015, 02:51 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 11-11-2015, 04:30 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 11-27-2015, 07:53 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 11-29-2015, 06:26 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 01-26-2016, 09:23 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 02-24-2016, 08:12 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-30-2016, 06:50 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-30-2016, 07:32 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-30-2016, 07:51 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-30-2016, 08:33 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-30-2016, 09:17 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-30-2016, 10:34 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-31-2016, 07:36 AM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-31-2016, 12:09 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 03-31-2016, 12:44 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 04-01-2016, 11:08 AM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 04-01-2016, 11:40 AM
RE: [split] LME49810 + EF Amp -zaštita - by nik - 04-01-2016, 02:12 PM
RE: [split] LME49810 + EF Amp -zaštita - by TDA - 04-01-2016, 02:15 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-30-2014, 05:24 AM
RE: LME49810 + EF Amp - by TDA - 08-30-2014, 08:53 AM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-30-2014, 09:34 AM
RE: LME49810 + EF Amp - by TDA - 08-30-2014, 11:17 AM
RE: LME49810 + EF Amp - by TDA - 08-30-2014, 09:20 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-30-2014, 10:54 PM
RE: LME49810 + EF Amp - by TDA - 08-30-2014, 11:14 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-30-2014, 11:30 PM
RE: LME49810 + EF Amp - by TDA - 08-31-2014, 08:20 AM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-31-2014, 08:46 AM
RE: LME49810 + EF Amp - by TDA - 08-31-2014, 11:06 AM
RE: LME49810 + EF Amp - by buca33 - 08-31-2014, 01:59 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-31-2014, 02:01 PM
RE: LME49810 + EF Amp - by Dragan100 - 08-31-2014, 03:48 PM
RE: LME49810 + EF Amp - by TDA - 08-31-2014, 04:31 PM
RE: LME49810 + EF Amp - by TDA - 08-31-2014, 07:18 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-31-2014, 08:11 PM
RE: LME49810 + EF Amp - by euronymous - 08-31-2014, 08:42 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 08-31-2014, 09:25 PM
RE: LME49810 + EF Amp - by TDA - 08-31-2014, 09:31 PM
RE: LME49810 + EF Amp - by euronymous - 09-01-2014, 05:44 AM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 09-01-2014, 07:30 AM
RE: LME49810 + EF Amp - by Dragan100 - 09-01-2014, 12:33 PM
RE: LME49810 + EF Amp - by buca33 - 09-01-2014, 01:52 PM
RE: LME49810 + EF Amp - by Dragan100 - 09-01-2014, 05:16 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 09-01-2014, 06:09 PM
RE: LME49810 + EF Amp - by Dragan100 - 09-01-2014, 06:55 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 09-01-2014, 08:33 PM
RE: LME49810 + EF Amp - by Dragan100 - 09-02-2014, 12:40 AM
RE: LME49810 + EF Amp - by TDA - 09-02-2014, 07:29 PM
RE: LME49810 + EF Amp - by Dragan100 - 09-02-2014, 07:41 PM
RE: LME49810 + EF Amp - by TDA - 09-02-2014, 08:20 PM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 09-02-2014, 09:02 PM
RE: LME49810 + EF Amp - by Dragan100 - 09-02-2014, 11:42 PM
RE: LME49810 + EF Amp - by Dragan100 - 09-03-2014, 01:17 AM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 09-03-2014, 05:20 AM
RE: LME49810 + EF Amp - by TDA - 09-03-2014, 06:41 AM
RE: LME49810 + EF Amp - by TDA - 09-06-2014, 09:56 AM
RE: LME49810 + EF Amp - by TDA - 09-06-2014, 10:29 AM
RE: LME49810 + EF Amp - by Marshall - 09-06-2014, 09:31 PM
RE: LME49810 + EF Amp - by TDA - 09-07-2014, 09:03 AM
RE: LME49810 + EF Amp - by HomeMadeAudioProject - 09-07-2014, 09:38 AM
RE: LME49810 + EF Amp - by TDA - 09-07-2014, 12:28 PM
RE: LME49810 + EF Amp - by TDA - 09-07-2014, 01:49 PM
RE: LME49810 + EF Amp - by Marshall - 09-07-2014, 02:45 PM
RE: LME49810 + EF Amp - by TDA - 09-08-2014, 11:24 PM

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