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Thread: 5v & 12v High Quality Power Adapter

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    Default 5v & 12v High Quality Power Adapter

    Hello everyone. I am building a case for my Raspberry Pi and would like a power supply for my Raspberry Pi and a Hard Drive. The Raspberry Pi runs on 5v at around 0.7A and the Hard Drive runs on 12v at 0.8A. Seasonic makes just what I need but I can't find anywhere to order it . Does anyone know of something like this - in this form factor with low noise and ripple etc. that I can buy in North America? Correct me if I'm wrong on any of this I'm still new to PSUs and this forum too.

    Seasonic PSU - http://seasonicusa.com/PDF/Catalog/N...-0301-0401.pdf

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    Have a look at this section :

    http://www.digikey.com/product-searc...verters/590377

    For example this for 38$ : http://www.digikey.com/product-detai...525-ND/2941854


    Alternatively, for something cheaper you can get one that outputs only one voltage, 12v or 5v and then use a dc-dc converter to get 5v or 12v respectively.

    See as an example this Delta 5v @ 10A power supply: http://www.digikey.com/product-detai...067-ND/4386538

    If you get a 5v only power supply, you can use a boost regulator like this one that will boost 5v to 12v - to make 12v @ 1A, it will need about 5v @ 1.5A so if you get a 5v 3-4A power supply and this dc-dc converter you'll be fine.

    If you get a 12v 2-3A or higher ac adapter and then use a buck regulator like this one to produce 5v - with 12v 1A, the regulator in the link can produce 5v 2A which is enough to power both the raspberri pi and the hard drive's 5v requirements.
    So 2-3A at 12v will be enough to power both.


    Digikey also has some open frame or close frame power supplies like the one you link to in another section here: http://www.digikey.com/product-searc...erters/4325929
    But you have to insulate the wires and connect a mains plug and so on... the previous ones are easier, you can just screw the cables on the psu.

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    Quote Originally Posted by mariush View Post
    that will boost 5v to 12v - to make 12v @ 1A, it will need about 5v @ 1.5A so if you get a 5v 3-4A power supply and this dc-dc converter you'll be fine.
    I sort of doubt that it's 160% efficient. 5V at 3-4 A would make more sense.

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    Pico power supply. I'm running a WHS 2011 based on the new AMD AM1 SOC & motherboard, 2 x 2TB HD & a SSD. I'm using the same 120w converter in the article and powering it with an old IBM laptop AC adapter brick. The system draws a little over 30w at boot, 22w at idle and 14w when the HD's spin down.

    The advantage of the external brick is that the case can be very small. At these low power draws, the 120w converter barely gets warm to the touch so even passively cooling the system is trivial.
    Old System: Asus P5K Pro, Q9550 @ 3.6 Ghz
    4 Gig G.Skil F2-6400CL4D-4GBPI-B
    LanKool K7 case
    SAPPHIRE HD 4670
    1TB Samsung Gig drive
    Rosewill Capstone-450-M R PSU

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