About Powersupplies !

[boyzie]

@leolas: Feel free to do so!

I wouldn´t mind, if this post is pulled in an other part of the forum by a mod or admin, but then i probably loose track of it.
Like out of sight, was there something ?
I only have a single tasking brain, multitasking is evil

@Felix1220: I´m vaping too. Do you order the modules directly in china? That was the reason i never really startet to build something own

@boyzie: As Felix1220 said it doesn´t matter. Think of tow tanks one with 1000l of water and the other of 2000l. The Pipe you use to get the water (or curret) stands for the voltage. If you get 10l in 1 minute out of the 1000l, you will get 10l in 1min out of the 2000l. It´s a silly comparison, but i learned that our trainees understand this the best way.

@lukesan: Thanks for the link. Great finding.


frog2001

Ok thanks for that......

[masbass]

Could something like this
http://www.****.co.uk/itm/DC-DC-Conv...item2c6579d834

be too much? Price isn't too expensive and says it outputs 5A

[frog2001]

Could something like this
http://www.****.co.uk/itm/DC-DC-Conv...item2c6579d834

be too much? Price isn't too expensive and says it outputs 5A

That would be ok. But be aware that this is an DC/DC converter. Great for cars or if you have an solar powered home.
But with a standard power grid in your home it will not work directly, because it is AC.
Normally you need a AC/DC-Converter.

I only mention it, because i don´t want anybody to destroy something, cause i missed to mention it.

frog2001

[white-enochian]

Use a psp charger works great 5v 2amp small brick

[masbass]

Yeah, I know, I just took it up a notch from the one posted above as I need to power MK808, USB hub, external USB 2.5" HD, USB webcam, bluetooth remote, USB ethernet dongle, CPU fan intalled on the mk808 chip.

For AC to DC, something like this would be needed:
http://www.****.co.uk/itm/25W-AC-90-...item51a8a57366
or
http://www.****.co.uk/itm/AC-110V-22...item5d3718d2e3

[sti.que.c.pas.facile]

http://www.****.co.uk/itm/AC-110V-22...item5d3718d2e3

I ordered one like this last week and should get it in a few days... this seems to be the more accurate PSU for our devices keeping in mind that you'll need to cut into one of your usb cables.

My only question is what usb cable should we use to cary the 2amp... or more ?
does usb 2.0 cable are enough or is it better to use usb 3.0 cable ?

[ahnah]

Can I use iPad USB Charger instead ? it says 5.1V => 2.1A

[kidaquarius]

Can I use iPad USB Charger instead ? it says 5.1V => 2.1A

I would like to know this as well. Would the extra 1000mV damage the equipment?

[leolas]

Re: About Powersupplies !

Originally Posted by ahnah<br />
Can I use iPad USB Charger instead ? it says 5.1V =&gt; 2.1A

<br />
<br />
I would like to know this as well. Would the extra 1000mV damage the equipment?

I think 0,1V will not damage the stick, I supose that, but I am not sure.

[kididaho]

Re: About Powersupplies !

Hello!


After reading here for some time, i thougt i´m able to clear some things up about the power problems with cheap powersupplies. I will try not to be to technical.

In the old days about 5 to 10 years ago, a powersupply for wallplugs was an big, black havy brick with a lot of copper and other meaner things in it. Quality was easily checked. If it was heavy it was good , if not it was crap.

Today it is not as easy as in the past.

After the mass appearence of the so called SMPS all changed. SMPS stand for "Switch Mode Power Supply".

The "new" kind of Powersupply has changed a lot of things.
1. It is much more efficent as the old transformator powersupplies.
2. Less powerconsumption if not used, but plugged in.
3. Today it is much cheaper to build.
4. Easy mass production

but on the other side there are

1. Very optimistic data about the usable power
2. Great potential source of electromagnetic and electronic disturbance

Ok, so why all the blah,blah.

If you have an 5 Volt 1 Ampere powersupply, you can thrust the 5 Volt. But don´t thrust about the current. If you drain more than 0.8 Ampere out of it the trouble normally starts. Because of being pushed to the limits, the normally clean and stable 5 Volt are being messed up with so called spikes.
Extremly short impulses that can mess up digital signals like the ones used in the MK8..
This can cause freezes, strange behavior, or even prevent system startup.
So it is better to use an powersupply that offers a much greater usable current.

But there is another problem with this powersupply. They are extremly poorly shielded from sending out electromagnetic waves. So if they are used in the upper limits of their usable current, they can start to mess up with the W-LAN. So if you have W-LAN issues and there are powersupplies nearby (less than an meter or so) try to get them away. You can be surprised about the results. This also counts for the W-LAN router/AP.

If you have any questions about this special theme, feel free to post your question.
If you can explain it better feel also free to post it

Nice Post.. See the one I just posted in the MK808 on WiFi..... cheers

frog2001

Jim
MK808 Tapatalk II

[kidaquarius]

Jim

Jim,

Did you quote the above text because it answered the questions that were posted just prior?

[kididaho]

Re: About Powersupplies !

Jim,

Did you quote the above text because it answered the questions that were posted just prior?

yes. the one posted by frog...its always good to see a post that does a breakdown like in the post. I had just posted one on WiFi and seen this one. thumbsup

Jim
MK808 Tapatalk II

[kidaquarius]

About Powersupplies !

I've been using my iPad 5.1V 2.1A charger for the past couple of hours while loading Finless 1.6A, installing CWM and backing up the ROM to SD. No ill effects thus far. :thumbup:

[djangokim]

Can I use iPad USB Charger instead ? it says 5.1V => 2.1A

I've used iPAD charger more than one month and I don't have any problem so far.

[lukesan]

Can I use iPad USB Charger instead ? it says 5.1V => 2.1A

As said before the amount of Amps that it can provide doesn't matter, as long as it is more than the requested one by the device.

The Voltage, well, 5 Volts and 5.1 Volts is like 2% higher .... not a slight worry