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Kuja

Koliko je jako ovo napajanje?

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Pre desetak godina mi je kolega napravio linearno 5V napajanje za Squeezebox.

Sada se razmišljam da ga iskoristim za napajanje Raspberry Pi-ja, na koji bih eventualno povremeno zakačio i neki eksterni 2,5" HDD.

Problem je što ne znam koliko ampera ovo napajanje može da isporuči.

Oznake na trafou kažu ovo:

 IMG_9799.jpg.9edbd762d42a44b4cd922fda5c48c854.jpg

 

 

Da li je tih 7,1A brojka koju tražim, :) ili je snaga ograničena još nečim?

 

Šema:

post-8784-0-00520000-1394883202.jpg.917e693c46089b759da0ad2aa3ba10d8.jpg

 

Napajanje:

post-8784-0-01748700-1394883123.jpg.aef19921a5bf59210afd090dc8c05caa.jpg

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Na trafou pise 1A.Jeste to malo rastegljivo... Zavisi sa kolikom gustinom struje je proracunavana debljina zice, i ostali parametri. I to je za taj tip punotlasnog ispravljanja i neki nazivni max. Ali mislim da je to dovoljno za eksterni hard disk koji je tu i najvci potrosac. Najbolje bi bilo opteretiti ispravljac otprilike onoliko koliko pise na HDu da je potrosnja, mozda nesto manje pa videti da li i koliko se greju trafo i hladnjak regulatora...

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31 minutes ago, Gosha said:

Ako je tu stavljen LT1085 njegova maksimalna struja je 3A,

U datasheet-u stoji da je min 3,2 a tipična 4A, možda bi bilo bolje zameniti sa LT1083 koji izdržava duplo veću struju.

Za pogon HDD-a i RPI-a je malo 3-4A (2,5" HDD obično vuče od 0,7 do 1A a za sam RPi ti treba 3A).

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1 hour ago, ZZZ said:

Na trafou pise 1A.

Na trafou pise 7.1A

1 hour ago, zek said:

U datasheet-u stoji da je min 3,2 a tipična 4A, možda bi bilo bolje zameniti sa LT1083 koji izdržava duplo veću struju.

Za pogon HDD-a i RPI-a je malo 3-4A (2,5" HDD obično vuče od 0,7 do 1A a za sam RPi ti treba 3A).

U datasheet-u stoji da je 3,2A-4A current limit, a da je regulator predvidjen za nominalnu struju od 3A. 

Za RPi ne treba viseod 800mA:

https://sr.wikipedia.org/wiki/Raspberry_Pi

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Pi traži struju. Sa 2A lepo radi. A to mu obezbedjuje u Samsungov punjačić za mobilni.

782645.jpg?time=1509726217

Zar HDD ne zahteva i 5V i 12V?

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Hvala svima na brzim odgovorima! :)

 

 

2 hours ago, Gosha said:

Nadam se da su diode u grecu shotki.

Nemam pojma koje su, evo slike pa vi recite da li valjaju :) :

IMG_9806.jpg.d73e1696d3aef2e3ca0353012b4ea962.jpg

 

 

2 hours ago, zek said:

Za pogon HDD-a i RPI-a je malo 3-4A (2,5" HDD obično vuče od 0,7 do 1A a za sam RPi ti treba 3A).

1 hour ago, Gosha said:

Za RPi ne treba vise od 800mA:

https://sr.wikipedia.org/wiki/Raspberry_Pi

Stariji modeli RPi-ja traže manje struje, noviji nešto više.

Fora je da su zahtevi za strujom znatno veći kada se na njih kače dodatne periferije.

Evo šta sam proizvođač kaže u vezi napajanja:

https://www.raspberrypi.org/documentation/hardware/raspberrypi/power/README.md

The Raspberry Pi 3 is powered by a +5.1V micro USB supply. Exactly how much current (mA) the Raspberry Pi requires is dependent on what you connect to it. We have found that purchasing a 2.5A power supply from a reputable retailer will provide you with ample power to run your Raspberry Pi. You can purchase the official Raspberry Pi Power Supply from our website, and you can learn more about the differing power requirements of the various models of the Raspberry Pi on our FAQ page.

Typically, the model B uses between 700-1000mA depending on what peripherals are connected; the model A can use as little as 500mA with no peripherals attached. The maximum power the Raspberry Pi can use is 1 Amp. If you need to connect a USB device that will take the power requirements above 1 Amp, then you must connect it to an externally-powered USB hub.

The power requirements of the Raspberry Pi increase as you make use of the various interfaces on the Raspberry Pi. The GPIO pins can draw 50mA safely, distributed across all the pins; an individual GPIO pin can only safely draw 16mA. The HDMI port uses 50mA, the camera module requires 250mA, and keyboards and mice can take as little as 100mA or over 1000mA! Check the power rating of the devices you plan to connect to the Pi and purchase a power supply accordingly.

 

 

Product Recommended PSU current capacity Maximum total USB peripheral current draw Typical bare-board active current consumption
Raspberry Pi Model A 700mA 500mA 200mA
Raspberry Pi Model B 1.2A 500mA 500mA
Raspberry Pi Model A+ 700mA 500mA 180mA
Raspberry Pi Model B+ 1.8A 600mA/1.2A (switchable) 330mA
Raspberry Pi 2 Model B 1.8A 600mA/1.2A (switchable) 350mA
Raspberry Pi 3 Model B 2.5A 1.2A 400mA
Raspberry Pi Zero W 1.2A Limited by PSU, board, and connector ratings only. 150mA
Raspberry Pi Zero 1.2A Limited by PSU, board, and connector ratings only 100mA

 

 

56 minutes ago, sir Oliver said:

Zar HDD ne zahteva i 5V i 12V?

Veliki 3,5" da,

eksterni 2,5" se napajaju sa 5V preko USB-a.

 

 

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Product Recommended PSU current capacity Maximum total USB peripheral current draw Typical bare-board active current consumption
       
Raspberry Pi 3 Model B 2.5A 1.2A 400mA

 

 

Ako sam dobro razumeo ovu preporuku, RPi uz upotrebu napajanja od 2.5A, može da gura dodatne periferije koje ukupno vuku 1.2A?

Onda sam ja sa ovim mojim napajanjem od 3A OK? :umnik2:

 

 

Probao bih da napravim SPDIF transport (tj, samostalni HDD plejer) sa ovom pločicom, jedino nigde ne piše koliko struje ona vuče:

https://www.allo.com/sparky/digione.html

digione.jpg

 

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Ja gonim RPi 3 sa 3A, a sve sto mu treba od fajlova imam na NASu koji glumi drugi RPI :) Cisto da ga rasteretim. Problem sa RPi je konekcija preko micro USB koji je stalno topao kod trojke koji god kabl da stavim. Naravno, samo kad ga opteretim.

Kod mene je Kodi na trojci i koristim ga i kao media centar i kakav-takav transport preko hifiberry digi kartice (koja btw ne trosi bog zna koliko struje). Probao sam i par kojekakvih dac boarda (Mamboberry, Hifiberry) i to se meni nikako ne svidja kako svira. Kao transport je okay, ali ti mali "DACići" nekako, pola muzike fali.

RPI + Hifiberry digi sa dobrim napajanjem = bolji spdif od mnogih transporta. Mislim da Bryston prodaje takav uredjaj za oko 1k$. Bez dobrog napajanja, dabome :)

 

EDIT:

" which for US$1295 gives us a Raspberry Pi and Hifiberry Digi+ snapped into a custom case and boxed up with switch mode power supply – a combination that might otherwise be purchased for well under three hundred hundred dollars. "

Izvor: http://www.digitalaudioreview.net

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