Any circuit which deliver the voltage & current for the Mobile Battery (4.5v) charging with just one AA type (1.2v/1.5v) Battery?
Specification:
Maximum Current：400mA
Output Voltage：5.7V+5%
Power source 1 X AA Battery.
Suits to charge Mobile phone, digital camera, PDA, MP3, MP4, etc.

This Blue Emergency Battery Charger for Mobile Phone is been soled by the e-bay
( http://cgi.ebay.com/Blue-Emergency-...117129?pt=PDA_Accessories&hash=item3f0133e249 )

I don't think so it can deliver 5.7v/400mA with just one 1.2v 0r 1.5v AA battery!!!!!!!!!!

 

An Alkaline AA cell has about 2.6wh of energy.
5.7v @ 400ma is 2.3w.
2.6wh/2.3w = 1 hour and 8 minutes of life @ 100% conversion efficiency.
At a more realistic 85%, you'll get 58 minutes.

 

An Alkaline AA cell has about 2.6wh of energy.
5.7v @ 400ma is 2.3w.
2.6wh/2.3w = 1 hour and 8 minutes of life @ 100% conversion efficiency.
At a more realistic 85%, you'll get 58 minutes.

But AA/AAA Battery is about 1.5v
then how it can charge 4.5v Mobile battery?
pl. explain with any CKT.

 

By means of a boost converter. http://en.wikipedia.org/wiki/Boost_converter

There is nothing very special about these gadgets, but note that you won't get much of a charge out of a single AA cell. In an emergency though, with no access to power I suppose you might be able to charge a phone enough to make a call or two.

 

The efficiency is dismal at best, though it is possible to do

Witness the disposable [ film ] camera, that employs a single AA battery to power its flash, which charges a capacitor up to a 200μf - 350 Volts dc to run the flash.
They recycle to be able to fire in roughly 30 seconds, not to mention the battery is still marginally useable after the film is all exposed...........

You will have to do your own research based on your electronic experience ?? to find and comprehend the necessary circuitry, because know this............those little camera circuits are downright deadly if handled improperly.

 

The efficiency is dismal at best, though it is possible to do

Witness the disposable [ film ] camera, that employs a single AA battery to power a flash, that charges a capacitor up to a 200μf - 350 Volts dc to run the flash.
They recycle to be able to fire in roughly 30 seconds, not to mention the battery is still marginal after the film is all exposed...........

Flash camera's have the LCR CKT. to boost and store the energy for the capacitor to charge for the film Camera but not in mobile

 

The camera is but one example that a single AA cell can be used for larger applications.

You will have to do your own research based on your obviously limited electronic experience ?? to find and comprehend the necessary circuitry, because know this............those little camera circuits are downright deadly if handled improperly.

 

Flash camera's have the LCR CKT. to boost and store the energy for the capacitor to charge for the film Camera but not in mobile

The "emergency" chargers normally use a fly-back principle, typically using a little ferrite bobbin choke just a few millimetres long. Similar things are seen in little torches (flashlights) that run white LEDs off just one alkaline cell.

 

The Mintyboost uses 2 batteries but if you download the schematic, at least you'll have an idea what a boost converter circuit looks like.
http://www.ladyada.net/make/mintyboost/

 

Solar garden lights use a simple and cheap voltage stepup circuit to use a single 1.2V rechargeable battery cell to light a 3.5V white or multi-colours LED all night long.
A solar garden light is on sale this week for only $.99.

 

The camera is but one example that a single AA cell can be used for larger applications.

You will have to do your own research based on your obviously limited electronic experience ?? to find and comprehend the necessary circuitry, because know this............those little camera circuits are downright deadly if handled improperly.

I found a webpage (might have been an Instructable?) that showed how to make a stun gun out of a disposable camera - using that same HV cap you mention. So yes - be <snip> careful!