DIY Power supply help

[ArthurJam]

Hello,

By advance, i'm sorry for my english.

For my personal project, a mini portable media center, I want a good power supply which can fully power my installation.
I need to power :

• a raspberry pi 2 with a usb wifi dongle, a usb bluetooth dongle and a hifiberry dac+ (on gpio)
  an official pi 7" touchscreen
  a 5V audio mini-amplifier

I have bought a switching power supply with an output at 5V - 4A :
http://i01.i.aliimg.com/wsphoto/v0/1747 ... -light.jpg

With this power supply I want to connect three usb connector.

Do you think this is a correct and viable electrical diagram ?

[ArthurJam]

If you have trouble to view the attached image, i post a new one :
http://postimg.org/image/o70g3ljer/

Thanks

[plugwash]

Hello,

By advance, i'm sorry for my english.

For my personal project, a mini portable media center, I want a good power supply which can fully power my installation.
I need to power :

• a raspberry pi 2 with a usb wifi dongle, a usb bluetooth dongle and a hifiberry dac+ (on gpio)
  an official pi 7" touchscreen
  a 5V audio mini-amplifier

I have bought a switching power supply with an output at 5V - 4A :
http://i01.i.aliimg.com/wsphoto/v0/1747 ... -light.jpg

A few things concern me about that power supply.

1: it appears you bought it from aliexpress (or at least linked to their site for the picture). Buying from "direct from china" suppliers is often a way to get seriously substandard products and with a power supply I wouldn't risk it. A bad power supply can be hazardous to both you and your equipment.
2: The label on the power supply is very sparse. Power supplies from reputable suppliers will normally have a lot more information on their label about the various approvals they have gained, the input current etc. This reinforces the view that it is probablly substandard.
3: The power supply has open terminals. Power supplies with open terminals need to be mounted inside a suitable enclosure which requires a tool/key to open.

http://postimg.org/image/o70g3ljer/

This wiring diagram looks ok.

[ArthurJam]

Ok,

You are right, i bought this power supply from china (aliexpress).
Where can i found a good quality equivalent ?
Do you know good seller (from europe) ?

I found that after a quick search : http://uk.rs-online.com/web/p/din-rail- ... s/7703267/

3: The power supply has open terminals. Power supplies with open terminals need to be mounted inside a suitable enclosure which requires a tool/key to open.

Can I make a wooden box to hold this power supply ?

Thx a lot.

[Burngate]

Two things that worry me in your diagram.
You have a fuse in the blue wire. Blue is normally the neutral, and so if a fault causes the fuse to blow, full mains voltage will still be present on the supply.
You appear to have a diode across the mains input. Please tell me you aren't going to do this.

[ame]

Two things that worry me in your diagram.
You have a fuse in the blue wire. Blue is normally the neutral, and so if a fault causes the fuse to blow, full mains voltage will still be present on the supply.
You appear to have a diode across the mains input. Please tell me you aren't going to do this.

It looks like the fuse is integral to the power inlet assembly. If the live wire is connected to the appropriately labelled input pin then the fuse will be in the right place. I also suspect that the diode symbol is intended to represent the neon bulb inside the (integral) switch.

[ArthurJam]

Hi,

Thanks to everybody for ur interest.

You have a fuse in the blue wire.

You are right the fuse in on the LINE (brown wire), I make a mistake on my schema.
The fuse and the diode are contained in power inlet assembly.

front : http://s11.postimg.org/pl7nsbczn/DSC01746.jpg
back : http://s9.postimg.org/j86gofwkf/DSC01753.jpg

[ArthurJam]

I found the official documentation of my chinese power supply :
http://leetone.cn/Upload/20091222111646942.pdf
Originally this power supply is for supplying a led driver.

[ArthurJam]

@plugwash

3: The power supply has open terminals. Power supplies with open terminals need to be mounted inside a suitable enclosure which requires a tool/key to open.

Can I make a wooden box to hold this power supply ?
Which features should I pay attention to when buying a power Supply ?

[ArthurJam]

Hello,

Can i protect the three usb outputs by a diode ?
How can i choose them ?

[ame]

Hello,

Can i protect the three usb outputs by a diode ?
How can i choose them ?

Is it necessary?

If you do this, you should choose a Schottky diode, as they have a low forward voltage.

[ArthurJam]

I'm not sure