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Upravo stiglo

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Upravo stiglo
vsavic Offline
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#2.461
01-03-2017, 11:57 PM
Jos jedna uspesna saradnja sa bracom kinezima, rade profesionalno za sve pare :-) Ovog puta uzeo i stencil da spasim sebi zivce pri nanosenju paste.


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Braca Offline
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#2.462
01-06-2017, 09:26 PM (This post was last modified: 01-06-2017, 09:27 PM by Braca. Edit Reason: P.S. )
Upravo stigle pločice za jednostavan, ali odličan, niskošumni merni pretpojačavač koji je konstruisao Scott Wurcer, čovek koji je napravio i čuveni AD797:

http://www.diyaudio.com/forums/group-buy...lexer.html

Meni ovaj pojačavač treba da pojača ostatak signala na izlazu iz pasivnog "notch" filtera u lancu za merenje THD. Vrlo interesantno rešenje za fiksiranje radne tačke ulaznog FET-a pomoću opto kuplera.

Oni koje interesuju niskošumni FET-ovi mogu na str. 15 gornje teme da nadju njihovu rang listu po kriterijumu nivoa šuma.

Pozdrav

P.S. Na slici su pločice za dva odvojena kanala, odn. pretpojačavača.
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Gosha Offline
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#2.463
01-06-2017, 10:16 PM
(01-06-2017, 09:26 PM)Braca Wrote: Upravo stigle pločice za jednostavan, ali odličan, niskošumni merni pretpojačavač koji je konstruisao Scott Wurcer, čovek koji je napravio i čuveni AD797:

Super.
Novac je sredstvo a ne cilj.
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Dragan83 Online
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#2.464
01-10-2017, 01:31 PM
Stiglo malo ladnjaka Smile


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TDA Offline
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#2.465
01-10-2017, 01:42 PM
I nešto TO3 tranzistora....
Sad si na*ebo! Kad ti jednom uđu u radionicu više ih se ne možeš otresti... Big Grin
Face up...make your stand and realise you're living in the golden years!
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HomeMadeAudioProject Away
majstor Kvariš
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#2.466
01-10-2017, 01:56 PM
ma stari je on "vrag",zna za jadac... Wink
Bože,daj svakome pameti - ni mene ne zaboravi...
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Dragan83 Online
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#2.467
01-10-2017, 02:08 PM
USli su odavno i uzeli maha Smile , ima na radisti neki lik prodaje povoljno razne hladnjake sve to na slikama 2200din a ima jos kolko ti dusa zeli...
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LordZi Offline
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#2.468
01-10-2017, 02:43 PM (This post was last modified: 01-10-2017, 02:44 PM by LordZi.)
(01-10-2017, 01:31 PM)Dragan83 Wrote: Stiglo malo ladnjaka Smile

Dobar ulov, imam iste ovakve, uzeo sam davno sa otpada, mislim da su bili u kutiji od nekih napajanja ili sl., bila ih je cela hrpa (bukvalno), nazalost sam uzeo samo tri. Tranzistori su 2N3772 original RCA, odlican kvalitet, puno sam Borinih ispravljaca napravio sa njima... Ispod svakog tranzistora ima keramicki izolator, isto odlicnog kvaliteta... Bilo je i mocnih dioda u onim rupama, kod tebe vidim nema ih... Wink
I'm gonna live forever or die trying...
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Dragan83 Online
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#2.469
01-10-2017, 05:09 PM
Ovde ima par keramickih izolatora vidi se da je neko menjao tranzistore i poskidao diode Smile al nebitno sami hladnjaci su odlicni a i ovi tranzistori sto su na njima su svi ispravni steta sto nisu samo za malo visi napon Smile ...
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TDA Offline
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#2.470
01-11-2017, 02:45 PM
Iskoristi ih za APEX BX100. Nije fora. Jedino sam ga ja sastavio... Smile
Face up...make your stand and realise you're living in the golden years!
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TDA Offline
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#2.471
01-17-2017, 04:44 PM

Malo sam se ponovio na poslu... Big Grin
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Macola Offline
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#2.472
01-17-2017, 05:38 PM
Lepo da te služi :-)
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tesla017 Offline
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#2.473
01-17-2017, 09:53 PM (This post was last modified: 01-17-2017, 09:55 PM by tesla017.)
@TDA cestito Wink

Ne moras da se sekiras za APEX BX100 Wink
Videcu da obezbedim MJE15031 ima ga ovde


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Braca Offline
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#2.474
01-18-2017, 03:19 PM
Niskošumni SMPS za male potrošače (+-15V/150mA i 3.3/5/6.5V, min. 0.5A (izbor kratkospojnikom)) koji je konstruisao Jan Didden u okviru jednog KickStarter projekta.

Karakteristike koje ima ovaj mali SMPS mogu se postići samo vrhunskim linearnim regulatorima (v. na https://linearaudio.nl/silentswitcher).
Napaja se preko USB priključka sa 5A/2A, mada može da podnese i 9V/2A, u kom slučaju se izlazne struje udvostručuju. Naravno, ako hoćemo da eliminišemo smetnje na ulazu u regulator, možemo ga napajati bilo kakvim čistim DC izvorom, uključujući i spoljašnje akumulatore za mobilne telfone.

Jedina mana ovog modula je što ga je nemoguće napraviti u DIY verziji. Didden za sada ne priča o daljim planovima, ali bih voleo da vidim komercijalizovanu verziju jer bi tada cena verovatno bila pristupačnija. Ja sam ga platio 59 evra (uključujući poštarinu), ali to je bilo više da bih doprineo uspehu projekta. S ovom cenom on je nekih 20 evra iznad Jung/Didden-ovog superreg-a, mada ovaj zadnji nema niskonaponski izlaz.

Ostaje još da ga isprobam u kombinaciji sa nekim niskošumnim pojačavačem i pogledam da li je zaista toliko čist kako Didden tvrdi.

Pozdrav
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vsavic Offline
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#2.475
01-19-2017, 01:15 AM (This post was last modified: 01-19-2017, 01:18 AM by vsavic.)
Ne pustaju me vise oko servera bez anti-static narukvice :-)

Ah da, a evo i sta sam dobio greskom sa AliExpress-a umesto QFN to DIP adapter. Smile
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TDA Offline
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#2.476
01-25-2017, 08:08 PM (This post was last modified: 01-25-2017, 08:08 PM by TDA.)
Stigao još jedan paketić od braće Kineza... Smile



Ekstra korisna spravica.
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majstor Kvariš
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#2.477
01-25-2017, 09:03 PM
milina jedna!
Bože,daj svakome pameti - ni mene ne zaboravi...
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Аритон Offline
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#2.478
01-25-2017, 09:28 PM (This post was last modified: 01-25-2017, 09:55 PM by Аритон.)
Sad kad TDA smota zavojnicu...


50 kinti u lokalnoj elektro radnji, uvek pri ruci prva pomoc za gramofon...
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euronymous Offline
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#2.479
01-25-2017, 10:36 PM
Bez zidarskog viska nemoj ni da pomišljaš da priđeš gramofonu   Big Grin
"Ako kaniš pobjediti, ne smiješ izgubiti" - Grunf
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#2.480
01-25-2017, 10:52 PM
Eto ti sad,
mesinganog ili bakarnog?
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