Wireless Electricity: Replicating MIT's Witricity on Smaller Scale

AI Thread Summary
The discussion focuses on replicating MIT's "Witricity" on a smaller scale using two coils to wirelessly power an LED. The user has successfully lit the LED at a distance of 10cm but seeks to increase this range by matching the resonant frequency of the coils. They plan to use capacitors in each circuit and apply the formula F=1/[2(pi) * sqrt(LC)] to determine the resonant frequency. Additionally, they inquire about measuring the inductance of each coil, providing details about their dimensions and number of loops. The conversation emphasizes the importance of resonance in enhancing wireless power transfer efficiency.
rburns
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I'm trying to replicate MIT's "Witricity", but on a smaller scale. I have a coil connected to a function generator and then a second coil (with more loops than the first) connected to an LED. So I guess now I have a transformer. And the LED lights up when the coils are up to 10cm apart. I would like to get more distance - so I think I need to match the resonant frequency of the two circuits, but I'm not sure how. I think I need to put a capacitor in each circuit and use F=1/[2(pi) *sq rt(LC)], to find the resonant frequency, but how do I measure the inductance of each coil? Thanks for any help!
 
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Will you please describe your coils a bit more?
 
The first coil is about 6 inches in diameter with 30 loops and the second is about 5 inches in diameter with about 40 loops.
 
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