Wirelessly power your iDevices!
Wow, I'm really surprised at how many views this is getting! Thank you everyone for reading!
I recently made a boost converter (for those unfamiliar with them, they effectively boost the voltage up to a useable amount) to make a USB Ipod charger using 2 AA batteries.
Now that that was done and over, tested tried and true, I decided I wanted to make something a little more snazzy!
Behold, the wireless ipod charger!
Uses all 12 volts of 6 (2 in parallel for each cell) lithium batteries!
Draws under 3 amps all the time!
Perfect for kids parties!
Now in 5 new flavors!
I've searched around on this website, and noticed that almost all of the instructables on here with wireless power seem to lack a proper explanation about how to build one; Or, when they did build one, they used an inefficient method of doing so...
This transmitter works fantastic, and can run on pretty much any voltage above 12 volts, and below 24! It's also extremely efficient (little power lost) and, it generates almost no interference. (one wireless power instructable used a square wave in the primary; Square waves have a lot of harmonics, and can cause havoc on computer systems, radios, and other sensitive electronics)
I've come to solve all of these problems!
Step 1: So you want to make it, right?
You'll need some parts.
2 MOSFETS - I understand that this is a rather vague statement. You can use the IRFP250, if you want to. However, the lower the on-state resistance is, the less heat will be generated. You can get these from any ol electronics supplier. Farnell, mouser, digikey, ebay
2 10k ohm resistors. (brown black orange) You can use 1/4 watt ones. Again, you can get these at the listed ones above, and even radioshack should have these.
2 Ultrafast Diodes - They need to be above 400 volts. I used UF4007's. Farnell, Mouser, Digikey, ebay...
2 Twelve volt zener diodes - Nothing special to say here! Again, Farnell, Mouser, and Digikey.
1 7805 - I know I said I used a boost converter. However, a boost converter is a whole another instructable, and I can't explain how to build one in this. So, for now, we'll just use a 7805. Radioshack has these in addition to the places listed before!
2 18k ohm resistors - 1/4 watt (brown - gray - orange) Radioshack, and the listed places.
2 12k ohm resistors - 1/4 watt (brown - red - orange) " "
1 Ferrite toroid - it can be around 1/2 inch in diameter. Wind roughly 30 turns of enameled wire on it, and you'll be set! You can get these from old Tube televisions scrapped, ATX PSU's. Basically anything you can take apart *should* have one of these.
USB Female Port - I scavenged mine from an old adapter PCI board we had from 2000. We didn't need it, so I figured why not? If you don't know where to get one, you should be able to get them from Mouser, Digikey, Farnell, and ebay.
Two sets of tank capacitors - I used 4 1 uF capacitors for mine. You can use two 2 uF capacitors instead, if you want to. You NEED to make sure they're MKP, or a better type! Polyester ones, electrolytics, anything along those lines will not work, and will overheat! WIMA makes some nice capacitors that work fantastic for this project. You can alternatively use Farnell, Digikey, or Mouser to find some MKP capacitors to use. Ebay will have some too.
You'll also need some 14 gauge wire, and tape!