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1  Hardware and U-Boot firmware / Hardware / Having replaced my Sheeva power supply... on: September 10, 2010, 03:29:42 AM
I have just replaced my sheeva power supply with a socket (60 pence from an electronics store) + an external (from a linksys router) power brick.

Very quick & easy but a couple of quick thoughts post operation:

A) With no internal power supply the sheeva runs with no noticeable heat..... which is a real bonus

B) Why don't globalscale simply offer the external power brick route (i.e. no internal power supply just a wired-in socket & a 2-3A 5V brick? This would markedly help with any heat & power supply problems & frankly were I to buy a guru-plug or similar I'd probably change it to using an external brick in advance of using it.



Adam

2  Hardware and U-Boot firmware / Hardware / PogoPlug vs Sheeva on: September 10, 2010, 03:23:03 AM
As a happy Sheeva plug owner (now that I've replaced the power supply) I was looking at possibly getting another with more USB posts or the e-sata etc.

PC World here in the UK are doing an offer etc on the pogoplug where the price has dropped to UKú70:

http://www.pcworld.co.uk/gbuk/pogoplug-personal-cloud-storage-device-06605507-pdt.html

Can I treat the pogoplug just like the sheeva or is it crippled to make it "pogo-distro only"?

TIA

Adam

3  Hardware and U-Boot firmware / Hardware / Re: USB Weirdness on: August 19, 2010, 01:49:41 AM
Could be the power supply. Plugging in the USB hub will draw more power, even if its only a little as your hub has its own power supply. If this is the case, the plug should stop booting even without the hub attached pretty soon as the power supply gets worse quickly once the capacitors have lost their electrolyte. NewIT sells replacement power supplies for around 10 bucks but shipping outside of Europe is expensive. Or you could hook up an external 5V power supply with around 10-15W.

Ahhh...OK

A) Is there a wiring diagram etc which says solder A to B etc?
B) I have a number of such beasties (a large drawer full of wallwarts) & I am now (having done a quick look on the forum wrt "power supply problems") wondering whether the wall wart is the answer as they normally outlast the electronics they power (hence the large drawer full).

Which do people recommend the external wall wart or the replacement PSU?

For one thing is the PSU daughter board mounted ergo connect external psu & remove internal psu thus increasing airflow/cooling etc?

Could be something else, of course, but it seems the original power supply will always fail sooner or later.

BTW, I've seen this kind of failure on other devices as well. My NSLU2's power supply failed the same way after one year of uptime. Switching power supplies require special low-ESR capacitors with high temperature tolerance but for some reason it seems many manufacturers want to save the few cents those capacitors would cost extra...

Thanks,
--Christian

Crikey I thought this died out in the late 90'es when pc mobo's had this problem wrt capacitors.....

Adam
4  Hardware and U-Boot firmware / Hardware / USB Weirdness on: August 18, 2010, 04:08:31 PM
I have the std SheevaPlug & it's been running like a champ for a long while (24X7).

It has an external 3.5 hdd (independantly powered) via a (powered) USB hub.

Suddenly...in the last week...If I plug anything into USB  (even just the hub if on boot though if post boot just the hub is OK) the plug keeps rebooting.


If I then unplug the USB hub & restart the plug starts OK but then the date is always reset to Sat Nov  8  1947

At this point not a lot works (e.g. dns etc because obviously the date is so far off ) but I can get on using ssh & reset the date & then everything works once more.

Plug in the hub (just the hub)  & everything stays working.....plug in the disk into the hub (or anything else USB e.g. my LIRC USB infrared adapter) &...... pow back to rebooting.....

Any ideas?

Adam
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