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Registered Member #3680
Joined: Wed Feb 09 2011, 12:48PM
Location: Porto Alegre - RS - Brasil
Posts: 3
Hello. In first place, congratulations Marko! It's a very nice project!! I want to develop the Marko project but have a doubt. What is the correct board that i use? Marko say that that the correct board is that have the relay but the date of this board is older than other. What i do?
Registered Member #3715
Joined: Sat Feb 26 2011, 06:51AM
Location: Australia
Posts: 1
Hey Ive been following this project and am attempting to construct my own. Just wanted to gleam a few details:
The receiver side, what are the specs of the components? From what I see its just a parallel setup of a cap and an inductor, however what are the values of these? They are supposed to match the those of the transmitter ~ 54.4 nF? Were you able to find a capacitor close to this? And inductor would be at 200 uH?
Also in the final diagram there is an additional cap C12, what value is this? Thanks.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi bix,
The L in the case of the receiver is a single loop as well, and C is indeed about the same as the transmitter. I used 47nF in my case, because the receiving loop was thinner conductor and had some more inductance than the transmitting loop (big 10cm pipe).
If you're out of tune you can place a ferrite core in one of loops and see where it helps. There's a ferrite core placed into the transmitter (prototype circuit in the second pic)
Registered Member #4043
Joined: Tue Aug 02 2011, 10:44AM
Location:
Posts: 1
Hi Marko,
Firstly I would like to thank you for the design, its simple and elegant, just what I needed :)
But now I have a small problem: I'm trying to use your circuit to drive a the transmitter at a frequency of around 300kHz, but I'm having trouble setting the RFC's so that the circuit would work properly...
I am not really familiar with RF theory, but I'm guessing there is a way to calculate the correct value of the RFC.
Registered Member #4067
Joined: Mon Aug 22 2011, 08:08PM
Location: Montreal, Canada
Posts: 2
Hello there, Firstly, thanks very much for posting this up Marko, its excellent Unfortunately, I am relatively new to creating my own electronics, and my schooling to date hasn't given me everything I need to complete it.
My questions are simple and noobish, but if anyone can help me I would greatly appreciate it. 1) Are RFC's directional, and if so, what is the appropriate way to solder them in/identify positive/negative terminals? and 2) on the mosfets, which 'legs' are the gate/drain/supply, so that I can connect it properly. Thanks, and again sorry for the amateur questions. I have added a picture of both to give context. thankyou
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Miniature wireless power demonstrator
