[SOLVED] Regular PC PSU to H2 jack cable adapter

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domih
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[SOLVED] Regular PC PSU to H2 jack cable adapter

Unread post by domih » Sat Jul 27, 2019 8:07 am

As clearly asserted by Tobetter (Hard Kernel) in viewtopic.php?f=172&p=262694, it is 100% OK to power the H2 with the 12v from a PC PSU as long as the SATA drives are also powered by the PC PSU and not the H2.

Thank you to Teraflop for his post, I guessed I had some proverbial matter in my eyes when I read the answer from Odroid :D I have modified the wiring accordingly and it works like a charm and it's shaving off 10W from the overall power budget!

---

Dear Odroid,

The online docs say "DC jack : outer (negative) diameter 5.5mm, inner(positive) diameter 2.1mm DC 14V ~ 20V (up to 60W)".

So I gather that a regular PC PSU outputting 12v won't do the job. Right?

If so, for "normal" people like "the rest of us" (meaning me) whose "electronics" skills can go so far as wire stripping, crimping and soldering would you consider yet another H2 cable accessory that (a) would include a shifter from 12v to let's say 17v (plus maybe an amp limiter so that we don't fry an H2 with a 450W PSU)(*) with on one side a male molex which we can connect to a regular PC molex cable and the expected male jack on the other side (b) Alternatively: just the shifter board we can fix inside whatever case we put the H2 in and we can take care of the wiring (c) Alternatively links to an already 3rd party solution (d) Alternatively a doc describing the required electronic components and how to connect them on a small bread board.

I'd really like (a) or (b).

You deliver excellent SBC solutions with a DIY easy level for newbie users (you are like the Ikea of the SBCs). With H2 I'm pretty sure you already discovered a new fauna of users who come for the PC side rather than the SBC side. Opening the path to PCIe via NVMe adapter will create the issue of powering the PCIe bus and PCIe devices to each newbie user attempting to do so.

The suggested adapter would make that path much easier, allow to use only one power supply and to power many devices directly from the PSU and not through the H2 board.

(*) That is the least powerful SFF PSU I could find at my local PC dealer...
Last edited by domih on Tue Jul 30, 2019 3:10 am, edited 1 time in total.

lungfish
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Re: Regular PC PSU to H2 jack cable adapter

Unread post by lungfish » Sat Jul 27, 2019 6:42 pm

The 5.5/2.1mm barrel jack is quite standard, the only thing that's (very) nonstandard is the 15V power supply. However, the specs say you can go up to 20V, what about using a generic 19V laptop power supply? I'm not sure what the increase from 15V -> 19V will do, perhaps a bit more heat output from the DC/DC converters? Other threads mention running off 19V supplies, is there a particular reason why it ships with a 15V supply rather than the more standard, and universally-available, 19V laptop type?

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Re: Regular PC PSU to H2 jack cable adapter

Unread post by lungfish » Sat Jul 27, 2019 6:51 pm

Ah, and answering my own question, looks like a 19V laptop supply is fine for use with the H2. So get any old laptop supply with a 2.1mm barrel jack connector.

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Re: Regular PC PSU to H2 jack cable adapter

Unread post by mad_ady » Sat Jul 27, 2019 6:52 pm

The 15V psu is probably cheaper than the 19V one.

domih
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Re: Regular PC PSU to H2 jack cable adapter

Unread post by domih » Sun Jul 28, 2019 11:40 am

Hi guys,

The thing is that between the drives and the network card I'm coming awfully close to 60W at boot time or during stress loading network and disks.

I think I found the solution:

1. Keep using a regular PC PSU to provide the 12v and 5v to the disks, the network card and its fan.
2. See https://www.aliexpress.com/item/33013326809.html for powering the H2 (gets the 12v from the PC PSU and outputs 19V max 57W to the H2).

This should do it, right?

Dominique

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Re: Regular PC PSU to H2 jack cable adapter

Unread post by odroid » Mon Jul 29, 2019 10:31 am

If your 3.5" HDDs are powered from the PC PSU directly, you can connect a 12V power rail from the PC PSU to your H2 like @tobetter's 6bay NAS project.
https://magazine.odroid.com/article/do- ... odroid-h2/
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domih (Mon Jul 29, 2019 12:40 pm)

domih
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Re: Regular PC PSU to H2 jack cable adapter

Unread post by domih » Mon Jul 29, 2019 10:52 am

I'm not concerned about powering the disks. What I'd like to do it to eliminate the H2 15v 4A power brick from the equation by powering the H2 using the PC PSU and the 12v -> 19v DC Converter I found on AliExpress. This should do it, right?

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Re: Regular PC PSU to H2 jack cable adapter

Unread post by teraflop » Mon Jul 29, 2019 12:30 pm

I believe what odroid is getting at is that even though the H2 is specified as needing a 14-20VDC input, you can actually run it directly from the 12V output of an ATX PSU, without a separate step-up converter. I have tested this myself and it seems to work fine. See this thread for more discussion: viewtopic.php?f=172&p=262694

The downside of using a 12V input is that there isn't enough voltage headroom for the onboard regulators to reliably supply 12V from the H2 to the SATA drives. But if you power the drives directly from the PSU, that shouldn't be a problem.
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domih (Mon Jul 29, 2019 12:39 pm)

domih
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Re: Regular PC PSU to H2 jack cable adapter

Unread post by domih » Mon Jul 29, 2019 12:40 pm

Got it thanks!

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SOLVED Regular PC PSU to H2 jack cable adapter

Unread post by Davidric » Tue Jul 30, 2019 3:14 am

Anywhere that does custom cables will be able to sort this out for you. Ive got one for a base expander and Ronin that faces inwards to the left which helps with clearance. Its a pretty chunky connector even then though, so you still need to allow a bit of space.

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