Picture of Wireless Power Charger!
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!
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GofishRC0073 years ago
Hey this is a great Ible! But I cannot read this section. BTW these are the Resistors in the sender schematic.
You gotta click on the little [i] and then the link to the original image link:

It's 18k and 18k on the top side, and 12k and 12k on the bottom side ;-)
Bodo110 days ago

Hello can you give me the steps of the circuit and the value of the components thanks

lovatatic_17 days ago
can you please give me the steps to make this , I'm lost
Hey, whats the range you achieved? Cause my circuit works but the efficiency drops extremely fast to 0% at a distance of 4 inches or so. Do you know what I could have done wrong?

One drawback to wireless chargers is that they don't achieve great distances. I'm not sure what the maximum distance is for this project, but 4 inches sounds about right.

Great project!Thumbs Up! :)

CatalinM12 months ago

I have just made this circuit and I ran into a problem.When I connected the circuit to the power supply the wires melted. Any ideea on why that happend?

ajha9 made it!4 months ago

hey thanks I MADE IT and won prize also ,I am still working on improving efficiency and range. HEARTLY THANKS TO INSTRUCTABLE.

Orngrimm ajha92 months ago

Congrats to this success! :)

Please let us know what you changed in your optimising and what the performance-change was.

uday.sring3 months ago

how can i simulate wireless power circuit please help me ..............

uday.sring3 months ago

how can in simulate the circuit of transmitter and receiving circuit

AlexanderH34 months ago

about how much does this cost to make total?

Greatlightt4 months ago

a vital information is missing from this project...WHAT IS THE INDUCTANCE VALUE OF THE 3 X 3 CENTER TAP COIL....

you said the coil oscillates at 50khz

Hey,can this charger will work for other phone

I think you can always replace the usb cable? since USB generally tend to be 5V I dont see any reason why you should not be able to?

Greatlightt6 months ago

i made it and its working.....i got 9v without using the 7805...i just wish i can increase the range of transmission

Hi, can u help me to troubleshoot my circuit.

ok whats the issue

Hi, my circuit is not working, i have used 2.2uf capacitor mkp similar type. I dont have cro to troubleshoot.

chilambarasan5 months ago

in which node have to check the square wave output at transmitter.

Greatlightt5 months ago

what is the resonant frequency

Klaxons6 months ago

Hey! What's diameter of the primary and secondary coils? I made those circuits, but I have only 0.7 A on the receiver.

DEVA RAJ8 months ago

can make to laptop wireless charger..?
bcoz i want to do final project for IT Networking can anyone help me

mnowak79 months ago

I dont know why but i cant get it to work. the first Mosfet gets just hot and I dont even get anything to the master coils : /

mnowak710 months ago

can i take 2 1n4007 diodes instead of the uf4007? I bought 1 instead of 2 of the uf4007's and I cant buy one more. Then i had to pay 5.4 shipping fee for 1 3 cent diode :/

rvan ham1 year ago

Looks simple and smart.

Gone make this for charge my divinglight.

apravin1 year ago

Hello i wanted to build a wireless charger to charge a 9V battery..... plz help me yar... thanx

What should be done for the 200-400 uH ? is the toroid ? if not where's the toroid in the circuit? and should we wind 30 more turns of enameled Cu wire on the toroid?
Yes, the toroid is the 200-400 uH inductor.
clienthax1 year ago
Would this work with the inbuilt coil on the nexus 4 etc?
No, the Qi charging circuit in the Nexus 4 requires a controller in the wireless charger circuit that communicates with the phone during charging.

parth36901 year ago
can you please tell me at which frequency did you resonate your loops? and why?
hooman59291 year ago
hi my friend

i live in iran and i make this boards but didn't work at the first i can't find the self :
1 : self is very important ? if i didn't install board not work ?
2: my mosftets has very high temp it is normal ?
would you please help me ASAP
inventious1 year ago
Is there a substitute for the 470 ohm 2w resistors?
hey author, i have connected the circuit, but i am also having the same problem!
when i coonect the transmitter coil to transmitter then the o/p voltage indicated by voltmeter is zero!
if i remove coil, then it shows 21V AC at the transmitter o/p.
please help me!
rogersc82 years ago
Hey. I have built up the primary but I am getting a short whenever I connect the primary coil to the circuit. Any ideas on how I can fix this?
i am also having the same problem as u!
warmaster242 years ago
do you have a patent on this method.
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