Wireless Power

Step 7 Extra Hardware

I have now added a AC to DC diode bridge which converts AC to DC. Then i added a Joule Theif to the diode bridge, which is a very simple circuit that can amplify input power (the Dc voltage from the diode bridge). http://www.youtube.com/watch?v=gTAqGKt64WM

This allows the LED to be lit when its father away from the coil, because the voltage going to the LED is higher. It is now able to power DC devices.

Comments

[happybuilder]

what's the extra hardware for?

[randomapps]

for converting the ac input current into dc allowing you to connect cellphones, ipods and other dc appliances to the coil (it has its limitations)

[happybuilder]

 ok, so I don't need to build that because I'm building a wireless batterie free mouse and pad.

[randomapps]

computer mice are dc!!!!!!

[KeviBear]

 Where the LED is this picture is, couldn't you just attach a female usb port instead and then be able to charge ipods? Or would you need to add a 5v regulator somewhere so you don't over charge it and kill the battery?

[ubr.bzkr]

What i will do with mine is try to get the secondary coil to output 3 volts to emulate 2 AA batteries and then hook it up to my minty boost usb charger kit (Ada-fruit kit) and see if that will charge my stuff. its already a small neat package, works on my usb stuff, and will make a nice, neat demonstration piece. I just hope the amperage will be correct also. might take some calculations though :$ .

[theawesomeninja]

won't the magnetic field screw the memory of an mp3 player or something?

[martianman]

 If you have a hard drive in the MP3 player, then yes. Examples: Older iPod models like the iPod 1G, and one of the newer iPod models: iPod Classic (5G).
If you have flash memory, then no. Examples: Newer iPod models (excluding, of course the iPod 5G) and all iPhone models, as well as most other MP3 players.

You could always use a ferrite choke to cut down on the magnetic interference on the cord running to the MP3 player. (www.radioshack.com/product/index.jsp?productId=3012599)

And of course, you could just test it out and see what happens...

[paulm]

 It takes a significantly strong magnetic field (such as a lab deguasser) to do any 'damage' to hard drive memory mediums. 

I would be more worried about the RF noise this thing is emitting. 

[theawesomeninja]

 So my c200 Sansa won't be affected by it?

[makee43999]

Yours Sansa C200 will be safe seeing as it is a solid state memory device so you can use this tech. with out erasing your MP3.

[theawesomeninja]

awesome! I think I might make one of these then!

[Algag]

 ipod touch 2g work? yes or no

[theawesomeninja]

should if made right

[Algag]

are you sure cuz i think touches use a hard drive?

[theawesomeninja]

I can assure u it has flash memory

[Algag]

 ok  thanks abunch

[Algag]

 ok 

[theawesomeninja]

THat being said i dont actually own one, but i'd like to.

[Algag]

 lol...smooth

[wolfkeeper]

The energy vampire thing is probably a bit overkill. I think all you need is a step up transformer and a single diode and capacitor. The bead might be all you need to make the transformer if you wind it right; and if the load is the LED, you probably don't even need the diode, just a resistor to limit current. If you do this though, you may need to up the frequency, the bead works best at high freq.