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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I also had my TC with the toroid removed and tuned, toroid nearby on a stool and my 'sympathetic secondary' arcing to the toroid over some 4" for fun. It's on video but it gets pretty washed out in the lighting and the flashes from the spark gap. If I can go through the footage and get a snapshot, I will post it.
I'll check out the lamp too. I have a 12V dome light I would like to light up. Man, if that thing did light up, just imagine the amount of current present! That's like 5A! This also gives me an idea for a RF wattmeter. Since a bulb doesn't care about AC DC or HF, the incadescent bulb will light with whatever.....this is becoming a neat idea. Sorta a poor-mans thermocuple ammeter. I can calibrate with DC and measure with LDR/precision opamp, send that to a DMM unit and the deed is done.
Thank's for seeding the idea. Gotta get back to writing up my cheat sheet for EE 430.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Maybe i wasnt clear about the bulb, if you watched the movie you can see its mot in series with resonator but several windings are wound (as some kind of secondary) in order to step down the voltage and increase current.
I wound 8 turns for 1W bulb of unknown voltage, it lights nicely meter away. Probably its not very efficient, nor the TC is (tends to melt down because of heatage) Using ferrite core would help there a lot, but then it would be very hard to tune resonance.
Here is the detailed pic how I connected the bulb.
I tried to rectify LV output but diodes I tried dont work at 2 mhz and heat up together with filtering capacitor.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
There is tape over them (for protection purposes before), but windings continue to the bottom. Maybe not visible in picture. Bulb lights nicely, at half a meter away I almost fried it, at 1 meter it is OK (you can see in movie) and also one neon bulb lights up just being near resonator.
If I move windings from base to top it makes very little difference.
So we can use lot of power even when breakout fully dissapears.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I ran 12V DC fan 1m away, rectified with varicap diode from some old tuner (really had no fast diodes at hand, all others I tried justbehaved 'shorted' at 2Mhz. Diode heats up but it lives, its probably overcurrented by fan but I didnt blow it yet. So with fast enough rectifying DC can be used also.
Thats maybe it, now I intend on winding couple of mini-coils and make some of them resonant for purpose of 'power transfer'...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Nice work firkragg! I wonder if this is the first example of anyone running a motor off Tesla wireless power? Tesla did it, but he had to use the lowest frequency coils he could make, and a special high frequency induction motor running directly off the HF AC, because he didn't have any rectifiers fast enough. I don't think he ever got enough power from a motor this way to do any useful work.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
For motor you would probably need frequencies in Hz range, hard to acheive even for huge coils. That was probably one of major faults of such energy transfer: no rectifying HF current.
Im about to use this secondary for small SGTC again, without resonance and poor transmitted power it acheived maybe the best possible result.
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wireless 'power' transfer?
