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uradi sam : opterećenje zvano "tupan"

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uradi sam : opterećenje zvano "tupan"
NIXIE Offline
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#201
10-19-2025, 09:23 PM (This post was last modified: 10-19-2025, 09:23 PM by NIXIE.)
To neću raditi sigurno.  Big Grin
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NIXIE Offline
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#202
10-20-2025, 08:34 AM (This post was last modified: 10-20-2025, 08:37 AM by NIXIE.)
Našao sam kod Kineza, 4 ventilatora 30x30x10mm, za 10eur sa poštarinom. Ima ih za razne napone napajanja. Imam neki mali SMPS 24V 1,5A  koji mi ne treba, a imam i mali SMPS strep down za 3A. Ako uzmem ventilatore na 12V to bi bila jedna varijanta, pa bi mogao ići bilo koji SMPS koji se nađe pri ruci, 19V ili 24V.  Imam puno punjača za telefone, mogu biti ventilatori svi i na 5V. Mogu da spakujem sve lepo na poklopac ove spravice i da se ravnomerno hladi kad treba, a kad ne treba nikom ništa.
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mikikg Offline
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#203
10-20-2025, 10:26 AM (This post was last modified: 10-20-2025, 10:28 AM by mikikg.)
Gledam ovde staru rashodovanu grejalicu sa ventilatorom "Heizlufter" ...  Dodgy

Hmm, spremljeno za kantu ali unutra ima Cekas i ventilator, pa ne treba nista vise od toga Smile

Prespoji se grejac i naprave dve sekcije od po 8Ohm, ventilator po potrebi ako krene da se topi kutija sa nekim mnooogo jakim AMP-ovima Smile
Verovatno isto tako moze i rashodovani fen za kosu ...

Ne trebaju nam kinezi za ventilatore i grejace Smile
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NIXIE Offline
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#204
10-20-2025, 01:16 PM (This post was last modified: 10-20-2025, 01:17 PM by NIXIE.)
Ma to je više teoretsko razmatranje, šta ako zatreba dodatno hlađenje. Ako stavim samo jedan ventilator u sredinu, bolje će se hladiti otpornici ispod ventilatora od ostalih. Za sada nikakav ventilator nije poteban, samo ću da skinem plastični poklopac kad to budem koristio. Više me zanima kompenzacija induktivnosti ako je potrebna, u audio opsegu samo.
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gorso69 Offline
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#205
10-20-2025, 01:23 PM
A zašto se juri čist termogeni otpor kad zvučnik to nije a pogotovo ne sa skretnicom ?
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NIXIE Offline
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#206
10-20-2025, 01:51 PM (This post was last modified: 10-20-2025, 01:55 PM by NIXIE.)
Pa ne bi valjalo da raste mnogo otpor load-a u merenom opsegu, mada sumnjam da ovo ima puno induktiviteta. To je ipak merenje, koliko W na toliko oma tog otpornika. Na zvučniku će biti svašta posle. 

Za ove visokofrekventne stvari i merenja ja nemam potrebe nikakve, to i ne razmatram.
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savan Offline
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#207
10-20-2025, 02:54 PM (This post was last modified: 10-20-2025, 02:55 PM by savan.)
Jel ovakvi otpornici kao sa slike nisu pogodni kao dumi load u audio merenjima?
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Zoksy Online
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#208
10-20-2025, 03:06 PM (This post was last modified: 10-20-2025, 03:10 PM by Zoksy.)
Savane zasto mislis da nisu pogodni.
U data schetu pise da su induktivni,ovi sa slike, dok za drugi model navode da su NEinduktivni.
HS-induktivni
NHS-NEinduktivni
To ja upravo pakujem.


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savan Offline
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#209
10-20-2025, 03:24 PM
Pitam cisto zato sto sam skoro sebi radio sa slicnim otpornicima...
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savan Offline
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#210
10-20-2025, 03:27 PM
U ovoj temi https://forum.yu3ma.net/showthread.php?t...aux+filter
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Zoksy Online
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#211
10-20-2025, 03:27 PM (This post was last modified: 10-20-2025, 03:30 PM by Zoksy.)
Ma šta im fali,služiće.
Moze slika kako si ti to uradio?

Ok, u isto vreme smo pisali.
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savan Offline
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#212
10-20-2025, 03:32 PM (This post was last modified: 10-20-2025, 03:34 PM by savan.)
Otpornike mislim da sam ove kupio https://www.mikroprinc.com/sr/proizvodi/...jak-100w-5 e sad dali su induktivni hmm to nisam ni gledao kad sam kupovao : )
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ronovar Offline
welcome back! 🙂
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#213
10-20-2025, 07:45 PM (This post was last modified: 10-20-2025, 07:45 PM by ronovar.)
Za otpornike Vam predlazem da odete kod forumaša koji ima lcr metar i izmjeti njihov otpor i induktivnost.

Ja imam UT622E i moze preko kelvin krokodilki izmjeriti u 1mR i 1uH tocnosti DUT.

Naravno moze i drugi LCR metar koji ko ima pri ruci a da koristi kelvin senzing stipaljke da se ima rezolucija.
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Zoksy Online
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#214
10-20-2025, 10:17 PM (This post was last modified: 10-20-2025, 10:18 PM by Zoksy.)
Bravarija i limarija odradjena.
Na prednjoj strani preklopnik za izbor 4-8 ohma.
Drugi preklopnik izbor "dummy load" ili zvučnici.
Preklopnici nisu nesto jaki pa ce biti zamena boljim.
Kasnije cu dograditi neki prekidač ili relejčić da kad predje 10v da prebaci merenje u rangu do 50v.
Na zadnjoj strani ulazi-izlazi i izlazi za osciloskop.

Instrumenti su malo veći ali upasovalo se nekako.


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NIXIE Offline
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#215
10-21-2025, 05:51 PM
Lepo je ispalo.
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HomeMadeAudioProject Away
...u svetu postoji jedno carstvo...
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#216
10-21-2025, 06:44 PM
bez poklopca izgleda opako!
...reci mi Bože,koje si boje kože...
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#217
10-21-2025, 06:58 PM
Hvala.
Ma to uvek zatrebe, ne samo za pojacala.
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