Usb to wall

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  #1  
Old 12-21-14, 05:47 AM
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Usb to wall

Hi all,
Is it possible if I can take a female to male usb (your usual usb extension cord) and cut off the male end, and solder it together with a TYPE A wall cord.
And also,
How many power cables are inside a normal wall outlet?

I am trying to make a usb phone charger out of this for my smartphone.
Thanks!

[ATTACH=CONFIG]43588[/ATTACH]
(Type A wall plug cord)

(Usb Male to female)
[ATTACH=CONFIG]43589[/ATTACH]
 
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  #2  
Old 12-21-14, 06:02 AM
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You can pick up plug style usb adapters at the checkout counter of your local convenience store nowadays, why would you attempt to jury rig one yourself? You also need to step it down to dc from ac current.
 
  #3  
Old 12-21-14, 06:17 AM
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I agree - there is too many options available -

Amazon.com: wall outlet with usb ports
 
  #4  
Old 12-21-14, 06:26 AM
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I agree with the others. They are too inexpensive to even mess making one at home. You can get them for about $3

Amazon.com: Home Wall 2 Port AC Outlet USB Charger Adapter Plug: Cell Phones & Accessories
 
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Old 12-21-14, 07:17 AM
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There are already listed receptacles that do what you are proposing. A link has been provided above. They are also available at big box and electrical supply houses.
 
  #6  
Old 12-21-14, 08:28 AM
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I already have many, i'd like to do it for educational purposes
 
  #7  
Old 12-21-14, 08:31 AM
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I see no educational value given the danger of making a USB that could be plugged into 120 volts.
 
  #8  
Old 12-21-14, 08:34 AM
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Ok, well thats fine if you dont recommend it,
but is it possible to be made and not fry the phone's battery?
 
  #9  
Old 12-21-14, 08:45 AM
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The voltage available at the receptacle is 120vac. Your phone needs 5vdc.

You need to come up with a way of converting the voltage.
It can't be done with wiring.... there has to be a voltage reducer/adapter inline.
 
  #10  
Old 12-21-14, 10:30 AM
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but is it possible to be made and not fry the phone's battery?
No. You will destroy the battery and likely the phone, or that your intent?
 
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Old 12-21-14, 11:03 AM
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It *can* be done, but you'd need a whole array of electronic components, transformers, printed boards made up, soldering, etc.
 
  #12  
Old 12-21-14, 11:30 AM
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Oh Ok, thanks PJmax
.
.
.
.
.
 
  #13  
Old 12-21-14, 04:04 PM
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Being only 20 miles South of the Canadian/Quebec Border, I hadn't worried too much about an invasion from the North . . . . until I read this thread.

Wow . . . . that's all; just wow !
 
  #14  
Old 12-21-14, 05:18 PM
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Lol, not intended to be like that
 
  #15  
Old 12-23-14, 03:05 PM
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You can look up DC power supplies online. The basic components you'd need:
- 120v -> 12v or 9v transformer
- Bridge rectifier
- 5v positive regulator
- 5v negative regulator
- Regulator heatsinks (if required based on amperage)
- capacitors
- USB A receptacle
- 0.5A Fuse or so

I'm sure you can find +/- 5vDC regulated power supply schematics online, it's been a while since I've designed/built one.

From an educational standpoint, it's not difficult to build one, but you want to be careful using it on your expensive electronics. I wouldn't want to short out my iPhone on a test charger!
 
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