Circuit Hack – How to Make a Wireless Gadget Charger!

If you have been keeping up with technology, it’s true, there’s actually ways you can wireless transmit energy.

Best yet, here’s a simple DIY that you can follow to experiment the wireless charging technology yourself.

Inductive Coupling uses magnetic fields to transfer power. There is a primary coil, which generates a magnetic field. Then there is another secondary coil which is composed of a capacitor and a coil, the capacitor creates a resonant circuit with the primary and secondary coils. Seem easy? Well, before publishing this instructable I found many useful and a lot of non-useful info on the subject.

In my research I found, that to transfer power in very complicated. Once i did it I found that you do not need to go to MIT do do this sort of stuff. With a little electrical know how, this is easy.

It all starts with the transmitter. This transmitter needs to create 147.7 kHz square wave AC signal. Let me take a minute to explain this all. Level one on the frequency scale is Hertzs, then there is kHz, then MHz. MIT used a 10 mHz wave to drive there coils, but for this we will be using a 147.7 kHz signal so it does not get too complicated.

The secondary coil has a 0.02 uF capacitor. This will allow the two circuits to be coupled therefore, transferring power efficiently. The 0.02 uF capacitor is used only for this frequency, and the value of this capcitor will change depending on the frequency.

The primary coil creates a magnetic field, when another coil is placed near it, energy will be induced into it.

Be in mind that i could not get a hold of a 0.02uF capacitor so i used two 0.01uF capacitors connected together.

via instructables


4 Responses to Circuit Hack – How to Make a Wireless Gadget Charger!

  1. Kyle says:

    Adding caps in series reduces total capacitance. So you just hooked up .5 uF.

  2. tiar says:

    niceeeeeee…….. how i can set the frequency,,,, can i make own transmiter,,,, you have the tranmiter scematic…?? help me,,,,

  3. David says:

    Tira and I are on the same page I followed your statement but it appears that you just stop Frist of all building the transmiter, What size wire, How long, How big the loop. Simple stuff like that

  4. Thomas says:

    @ Kyle – The capacitors are in parallel in the picture…. so he did it correctly.

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