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Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
For a science fair project I want to try running a tube Tesla coil at different frequencies and measure the distance I can light a florescent bulb from to see if different frequencies allow more efficient power transfer. This involves three different secondaries and tank capacitor combination. For this I need to run the tube at about 1Mhz, 600 KHz and 300 KHz. Can a feed back tesla coil like Steve Ward's be run at 1Mhz or will I need a different driver?
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
It should be fine I think. Tubes can handle a wide variety of freq ranges as long as it's within the specified ratings. Some people like to push the ratings of the tube by using a staccato controller which causes the average power dissipated by the tube to go down. Right?
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
Do any of you think the idea for the science project is workable? Or will losses at higher frequencies just give me false results? What is the record for the fastest tube tesla coil?
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
1MHz is nothing for a tube based coil, they are more or less the same thing as a class E am transmitter that is good for tens if not hundreds of MHz.
Plasma formation doesn't work quite as well at the higher frequiencies, above about 3MHz or so you start to get more of a flame than a streamer, although if you are trying to light florescent tubes you would want to put on a big topload and suppress streamer formation alltotogether so it doesn't really matter...
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Weston wrote ...
For a science fair project I want to try running a tube Tesla coil at different frequencies and measure the distance I can light a florescent bulb from to see if different frequencies allow more efficient power transfer. This involves three different secondaries and tank capacitor combination. For this I need to run the tube at about 1Mhz, 600 KHz and 300 KHz. Can a feed back tesla coil like Steve Ward's be run at 1Mhz or will I need a different driver?
I wouldn't do it that way. Just my opinion and choice of course.
Instead, i would perhaps attempt to "map out" the electric field with the flourescent light for a given mode of operation. By moving the light in different locations with respect to the coil, you should be able to "map" out a 3D electric field drawing. Perhaps, even have the brightest calibrated someway to color code different level of e-field and show the mathematical relationship of electric field graidents / vs. location etc...
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
However would there be a noticeable difference in how far away I can light up the florescent bulb at at 1 Mhz compared to 300 khz? Also does anyone know where I could get a Toroid for my Tesla coil? The only two places I can find are Ebay and amazing1.com. Also can I use this Tesla coil calculator to find resonant frequency of my secondary? All it requires is feet of wire to be used
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
And about the Tesla coil calculator all it requires is feet of wire for the resonant frequency can I use it calculate how much wire i need for my secondaries?
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1 Mhz 811a tesla coil?
