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Da ne otvaram novu temu, par pitanja...

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Da ne otvaram novu temu, par pitanja...
Aca93 Offline
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#41
06-28-2013, 11:34 AM
To je ovo <a href="http://www.proelectronic.rs/LEPAK-DVOKOMPONENTNI-EPOXI-SKY-2X6ml-LEPAK-SKYEG6-6764.htm">http://www.proelectronic.rs/LEPAK-DVOKOMPONENTNI-EPOXI-SKY-2X6ml-LEPAK-SKYEG6-6764.htm</a>?


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TDA Offline
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#42
06-28-2013, 05:44 PM
Nešto tako.
Ja koristim ovo http://www.complexart.ro/adeziv-unisumma-mix-marmo-legno-27-g-saratoga.html
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Aca93 Offline
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#43
07-01-2013, 12:18 AM
Ok probacu.

Hvala!
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cakani Online
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#44
07-02-2013, 12:01 AM
Pozdrav svima. Imam jedan mali problem. Naime potrebne su mi zenerke ZTK11 i ZTK22 koih naravno nema vise niko na lageru pa mi palo na pamet da mozda mogu da resim problem sa tl431 pa me zanima da li se ko igrao sa ovim.Koje otpore da uoptrebim reda kilo oma ili reda desetak kilo oma.Nerazumem ono u obrascu za racunanje sa referentnim naponom jer znam da je kod njih referentni napon 2,5 (2,495) volti.Neslazem se najbolje sa engleskim pa bi mi mala pomoc (objasnjenje) dobrodosla.Hvala unapred i pozdrav
MILAN
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TDA Offline
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#45
07-13-2013, 08:57 PM (This post was last modified: 07-13-2013, 09:00 PM by HomeMadeAudioProject.)
Da li neko zna kako da ovo upotrebim?
[attachment=3018:IMG_20130713_214824_269.jpg]


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Na sebi ima HEF4070BT.


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mickeyzg Offline
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#46
07-13-2013, 09:09 PM (This post was last modified: 07-13-2013, 09:13 PM by mickeyzg.)
Četverostruka X-OR vrata. Koristi se u TTL sklopovima, koji rade sa logičnim 0 i 1 signalima. Ako me sjećanje ne vara, serija 40xx (CMOS) je radila sa naponima do 12V, a serija 74xx isključivo sa 5V. Korisno je uglavnom za neki digitalni logički sklop, sa analognim signalima se ne mogu koristiti.

<a href="http://html.alldatasheet.com/html-pdf/17726/PHILIPS/HEF4070B/499/2/HEF4070B.html">http://html.alldatasheet.com/html-pdf/17726/PHILIPS/HEF4070B/499/2/HEF4070B.html</a>
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TDA Offline
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#47
07-13-2013, 09:14 PM
To me i zanima. Kako napraviti elektroniku za njega da mi pokazuje info o ampu ili preampu (jačina, temperatura ili nešto drugo...).
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mickeyzg Offline
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#48
07-13-2013, 09:21 PM
Aha, krivo sam shvatio, mislio sam da misliš na ovaj mali čip gore. Tek sad vidim da je to digitalni instrument Big Grin
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mickeyzg Offline
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#49
07-13-2013, 09:27 PM (This post was last modified: 07-13-2013, 09:31 PM by mickeyzg.)
traži panelmeter HED072, mislim da je taj. U doljem lijevom kutu slike, ispod CE oznake je označen tip
Google mi za sada nije ništa konkretnog izbacio
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TDA Offline
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#50
07-13-2013, 09:33 PM
Jeste HED072.
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mickeyzg Offline
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#51
07-13-2013, 09:36 PM
bingo

<a href="http://www.docstoc.com/docs/8893992/Panel-Mount-Digital-Multimeters-HED271-HED272-DPM961-DPM962">http://www.docstoc.com/docs/8893992/Panel-Mount-Digital-Multimeters-HED271-HED272-DPM961-DPM962</a>
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TDA Offline
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#52
07-13-2013, 09:47 PM
Hahaha. Big Grin Big Grin Big Grin
Hvala mickeyzg! Poslužiće.
Moraću da probam.
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mikikg Offline
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#53
07-14-2013, 03:39 PM (This post was last modified: 07-14-2013, 03:55 PM by mikikg.)

To me i zanima. Kako napraviti elektroniku za njega da mi pokazuje info o ampu ili preampu (jačina, temperatura ili nešto drugo...).

Pa jedino temperatura ima smisla da se meri sa tim, sve ostalo sto je vezano za zvuk nije preterano upotrebljivo, ima da shetaju te cifre gore-dole (ako bi merio snagu ili struju) i nista pametno nece da pokaze.
Moze eventulano da se prikaze postavljena jacina zvuka, nesto kao sta znam 0-100 ali to malkice komplikuje situaciju oko Volume potenciometra, ili nekako mehanicki preko osovine da zakacis jos jedan potenciometar na postojeci za jacinu ili da pravis neke VGA / VCA (variable gain amplifier / voltage controlled amplifier) pa da jacinom upravljas DC naponom sto za neke malo ozbiljnije perfomanse nije ni malo prosto a i delovi nisu bas lako nabavljivi niti jevtini.

Mislim jeste lepo displejce i elektronika unutra (sigurno sa druge strane PCB ima neka crna zalivena budzica, to je A/D konverter, nesto vrlo slicno ako ne i isto kao ICL7107) i to je predvidjeno za merenje relativno sporo promenljivih velicina jer je moguce uzorkovanje do 3 puta u sekundi rezolucijom od 12bit.
Mozda ti sad malkice jasnije bude ono sa DSP, isto ima 12bit A/D konverter ali sempluje skoro milion puta brze, nesto malo sporije ali je tu negde Wink

Mozda je ipak korisnije da ga upotrebis za njegovu osnovnu namenu, merenje DC napona ili struje u nekom laboratoriskom ispravljacu.
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TDA Offline
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#54
07-14-2013, 08:24 PM
Pa to će mu i biti...
Pretpostavio sam da ćeš ti odgovoriti... Big Grin Big Grin Big Grin
Hvala momci!
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TDA Offline
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#55
08-18-2013, 09:06 AM
Da li neko zna da izračuna snagu ovakvog trafoa?

[attachment=3471:Fotografija-0391.jpg]


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TDA Offline
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#56
08-20-2013, 09:06 PM
Neću da budem dosadan, ali da li neko zna da ovo izračuna?
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Dude Offline
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#57
08-20-2013, 09:28 PM
Proveri precnik sekundara pa ces imati neku predstavu o cemu se radi... Ako bolje ne moze.
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HomeMadeAudioProject Away
majstor Kvariš
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#58
08-20-2013, 09:30 PM (This post was last modified: 08-20-2013, 09:31 PM by HomeMadeAudioProject.)
probaj ovako da se snađeš - ko se računa da je gustina struje kroz žicu 2,5A po mm kvadratnom,izmjeri debljinu žice sekundara pa sa r^2 x 3.14 dobiješ površinu poprečnog presjeka. tu cifru pomnoži sa 2,5 i dobićeš struju sekundara,a napon izmjeri sa samog trafoa. umnožak napona i struje je... Big Grin

vodi računa o razlici r i R tj poluprečnik=r i prečnik=R a R=2r. u formuli se gleda r...
Bože,daj svakome pameti - ni mene ne zaboravi...
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#59
08-20-2013, 10:05 PM (This post was last modified: 08-20-2013, 10:06 PM by TDA.)
Prečnik žice na sekundaru je između 1,25 i 1,5mm. Jbg nemam šubler...
Napon na sekundaru je 2x19VAC, odnosno 38VAC.
Prateći računicu za 1,25mm dobijam oko 116VA, a za 1,5mm oko 168VA.
Da li je to OK?
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TDA Offline
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#60
08-20-2013, 10:10 PM
Zaboravih da se zahvalim.....
U svakom slučaju će biti dovoljno za 2xTDA2050 (2x30W) sa regulisanim napajanjem sa 2x27V na 2x22V.
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