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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GofishRC0072 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 ;-)
Greatlightt1 month 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.

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

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

Greatlightt20 days ago

what is the resonant frequency

Klaxons1 month 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 RAJ3 months ago

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

mnowak74 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 : /

mnowak75 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 ham7 months ago

Looks simple and smart.

Gone make this for charge my divinglight.

apravin8 months 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?
megapix clienthax9 months ago
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!
rogersc81 year 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!
do you have a patent on this method.
JasonOng1 year ago
I have setup the circuit as what you have shown. But I unable to get the any output from the receiver. My Input volt is 12 Volt and 4.5 Amp. Receiver and transmitter coil are 10 cm for diameter and 4 round of 28 gauge wire. For the MOSFETS, I am using IRFP250N. I have connect from the inductor to the center tap part of the transmitter coil.
hey admin can u pls tell me what is that in black thing in front of reciver coil one is rectiferand other is mkv but what is that black thing i hav buyed evey part but what is that and also in ur reciver session ur reciver original photo and circut diagram dont match pls help me in ur circut diagram u have connectd booster but in photo u havent pls replay me fast and also tell me what is valu of the capicator and what type of capicator is that in reciver session
gdirty1 year ago
Is the primary and secondary coils the same number of turns?
akr17141 year ago
Can u pls tell how we can modify this ckt to charge SAMSUNG S3??

Whether the DIY inductive charger available in the market for SAMSUNG S3 would work??
what was the voltage on load , will it be necessary for a boost converter
im going to try to make a smaller more efficient version just was wondering, im gonna try to get away with using a single irfp 450
Chester021 year ago
Hi! A very cool project!! Could you tell what is the frequency of the transmitter?
does the thickness of toroid effect the range of 200-400 uH as mentioned by you?
cstriker2 years ago
Dear author,
I've selected your design as my undergrad project but I'm having some complications. Could you please help?
I want to use AC source instead of DC. What modifications do I need to make? Can I use another bridge rectifier on the transmitter side to convert it to DC? Can I use any other type of capacitors instead of MKP or MKT type?
Waiting for your reply
rajib_4uu2 years ago
Hey...I have completed your got the power at range between the two coil is only 4-5 inch...Is this possible to transmit power with this circuit almost 4-5 meter....If possible plz reply dear....i need it immediately for my semester project plz replay urgent...What i have to do also plz provide me some suggestion...tnx
reavand2 years ago
hi, i have done this project and its working but i cant charge my phone cause the output give me 5v and 0.25 amp only. as i know to charge the phone we need 0.5 amp. can u help me with this ?
reavand2 years ago
hi, i have done this project and its working but i cant charge my phone cause the output give me 5v and 0.25 amp only. as i know to charge the phone we need 0.5 amp. can u help me with this ?
Can you make the hoops smaller? (such as 1cm,just to plug a box into an ipod and rest it on a table.) :)
cshah12 years ago
hey , does this project work only for the apple phones and not for the other smart phones ??
macman112 years ago
I really like what you've done with the boost converter but it makes it so big and bulky that its not exactly practical, another way to up the voltage is to take advantage of the fact that this is a resonant transformer so while the inductance and capacitance play a major role the number of turns you have can increase or decrease your voltage, you just need to make sure to match the resonant frequencies for both the transmitter and the receiver. for mine I used about 9 turns of 12 gauge wire (approx 2microhenries) and about 23 turns of 28 gauge wire (approx 11micro-henries) now when I pump in 12 volts I get about 25 volts max. just a tip because I have managed to fit it to the back of my phone and it works great.
sujithZis2 years ago
can you give me more specific information about the boost converter please.................
and can you tell me why that fan is used and also that silver thing behind the mosfet
cuz i really need to to make something for my science exhibition
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