drifterf
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Non Plug Top Power Supply

Tue Oct 22, 2019 5:47 am

Hi, i am looking for a power supply which does not use a plug top as the transformer.

more like a encapsulated power supply. the idea is i want to wire the 240v feed straight into a fused spur for a project.then just normal usb charger into the pi.

thanks

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DougieLawson
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 6:42 am

Best of luck finding that. Those things do not exist.

You can get a UBEC from eBay, AliExpress or Banggood that will drop 12V down to a stable 5V and build your own based on an old laptop power brick.
Note: Any requirement to use a crystal ball or mind reading will result in me ignoring your question.

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PeterO
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 6:57 am

drifterf wrote:
Tue Oct 22, 2019 5:47 am
Hi, i am looking for a power supply which does not use a plug top as the transformer.

more like a encapsulated power supply. the idea is i want to wire the 240v feed straight into a fused spur for a project.then just normal usb charger into the pi.

thanks
It's not clear what you are trying to do.
At the start you say you don't want a "plug top transformer", then later you say you you will use a "normal usb charger". All the USB chargers I've seen ARE plug top devices ....

Can you draw a diagram or a picture to show what you are trying to achieve ?

PeterO
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rpdom
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 7:17 am

PeterO wrote:
Tue Oct 22, 2019 6:57 am
Can you draw a diagram or a picture to show what you are trying to achieve ?
I think what the OP wants is something like this:

Code: Select all

MainsCable====[power brick]-----MicroUSBPlug
without a mains plug, just bare cable, and no other adaptors/extension leads etc.
Unreadable squiggle

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PeterO
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 7:31 am

So something like this with a cannibalised USB cable on the output :-)
https://www.rapidonline.com/tt-electron ... s5-90-2501
PeterO
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rpdom
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 7:39 am

PeterO wrote:
Tue Oct 22, 2019 7:31 am
So something like this with a cannibalised USB cable on the output :-)
https://www.rapidonline.com/tt-electron ... s5-90-2501
PeterO
Possibly, but I suspect it needs to be enclosed.
Unreadable squiggle

fruitoftheloom
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 8:07 am

https://www.screwfix.com/p/lap-usb-char ... hite/151CC

ae235.jpeg
ae235.jpeg (8.11 KiB) Viewed 1299 times
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PeterO
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 8:14 am

Even better :-)
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fruitoftheloom
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 8:45 am

https://www.amazon.co.uk/Bay-City-Elect ... B01BNGVCC4

Each port will deliver up to 4.2 Amps charge so that you can charge all devices with no worry.

61Gnisx5LLL._AC_SL1500_.jpg
61Gnisx5LLL._AC_SL1500_.jpg (47.58 KiB) Viewed 1269 times
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Imperf3kt
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 2:38 pm

DougieLawson wrote:
Tue Oct 22, 2019 6:42 am
You can get a UBEC from eBay, AliExpress or Banggood that will drop 12V down to a stable 5V and build your own based on an old laptop power brick.
Note that most laptop power bricks are not 12v, but instead either 19v or 20v
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52:4C:52:42:41

drifterf
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 4:15 pm

PeterO wrote:
Tue Oct 22, 2019 7:31 am
So something like this with a cannibalised USB cable on the output :-)
https://www.rapidonline.com/tt-electron ... s5-90-2501
PeterO
thanks this is more what im looking for. it will be built in a case anyway. its a access control unit we have done using PIGPIO and Wiegand. the idea is to build this into a automated large sliding gate. many thanks i think im going to try this

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rpdom
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 4:21 pm

drifterf wrote:
Tue Oct 22, 2019 4:15 pm
PeterO wrote:
Tue Oct 22, 2019 7:31 am
So something like this with a cannibalised USB cable on the output :-)
https://www.rapidonline.com/tt-electron ... s5-90-2501
PeterO
thanks this is more what im looking for. it will be built in a case anyway. its a access control unit we have done using PIGPIO and Wiegand. the idea is to build this into a automated large sliding gate. many thanks i think im going to try this
I do use power supplies like the one PeterO has suggested on some of my Pis.
Unreadable squiggle

hippy
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Re: Non Plug Top Power Supply

Tue Oct 22, 2019 11:05 pm

One of the problems with using wall-mounted USB outlets is they are often proverbial "chargers" not necessarily "power supplies".

I have read forums elsewhere reporting the common problem of voltage dropping as more current is drawn, huge amounts of ripple, and even overheating and turning off with prolonged use.

I guess it's definitely one of those cases of YMMV depending on manufacturer / model.
Last edited by hippy on Wed Oct 23, 2019 10:31 am, edited 2 times in total.

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PeterO
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Re: Non Plug Top Power Supply

Wed Oct 23, 2019 7:18 am

No longer needed.....
Last edited by PeterO on Wed Oct 23, 2019 10:32 am, edited 1 time in total.
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hippy
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Re: Non Plug Top Power Supply

Wed Oct 23, 2019 9:38 am

Also no longer needed
Last edited by hippy on Wed Oct 23, 2019 9:57 pm, edited 1 time in total.

LTolledo
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Re: Non Plug Top Power Supply

Wed Oct 23, 2019 10:01 am

fruitoftheloom wrote:
Tue Oct 22, 2019 8:45 am
https://www.amazon.co.uk/Bay-City-Elect ... B01BNGVCC4

Each port will deliver up to 4.2 Amps charge so that you can charge all devices with no worry.


61Gnisx5LLL._AC_SL1500_.jpg
so this is a "replacement" for a wall receptacle, and just supply 5v?

will this require (in your area) a certified electrical technician to install (to the wall)?

to use this "off-the-wall" then one will need some wires and a plug.... then it becomes a plugged power supply once its plugged to the wall receptacle...
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PeterO
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Re: Non Plug Top Power Supply

Wed Oct 23, 2019 10:09 am

No longer needed
Last edited by PeterO on Wed Oct 23, 2019 10:33 am, edited 3 times in total.
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DirkS
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Re: Non Plug Top Power Supply

Wed Oct 23, 2019 10:10 am

hippy wrote:
Wed Oct 23, 2019 9:38 am
PeterO wrote:
Wed Oct 23, 2019 7:18 am
hippy wrote:
Tue Oct 22, 2019 11:05 pm

One of the problems with these type of supplies is that they are often proverbial "chargers" not necessarily "power supplies".
I think it's insulting to suggest I would post a link to such an item !
I was referencing this -
Then you need to be more careful with your quotes.
Look back and you will see that the quote you're using (from @rpdom) actually is about the rapidonline PSU

hippy
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Re: Non Plug Top Power Supply

Wed Oct 23, 2019 10:26 am

DirkS wrote:
Wed Oct 23, 2019 10:10 am
Then you need to be more careful with your quotes.
Fair enough; I have updated my post accordingly. I was merely trying to warn people of potential issues with using wall-mounted USB outlets.

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Imperf3kt
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Re: Non Plug Top Power Supply

Wed Oct 23, 2019 9:39 pm

Don't forget your wet string between the wall mounted plug and your Pi.
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