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Registered Member #53981
Joined: Tue Dec 16 2014, 02:23AM
Location:
Posts: 7
Hi, I'm trying to build a base fed "VTTC", I'm not sure where to post this tread since it's not technically a "Tesla Coil" so I thought I'd ask here. Now I'm building one that's based on this: (the site is in Russian)
Here's the schematic (it's also shown of the site):
Here's my circuit all wired up being powered on around 900 volts (this is after all the experimenting I did to try to improve the output)
When I put it together it worked but just barely, I had quite a small, less than 5mm flame. I had to do a lot of experimenting trying to improve my output so here's what I did.
I don't have exactly the same wire as in the schematic, but I found out that if I make the choke have the same properties as the output coil, I get the best results so far, so I made two coils that are exactly the same, I used one as my choke, and the other one as my output coil, they are both 27 turns of 1.5mm insulated wire on 5 cm diameter cardboard tubes and both have about 29uH inductance.
Also I didn't get very good output using the same kind of home-made capacitor feedback system that he used, I found a 3/4 turn antenna cut from a drink can placed around the output wire works better.
The only other difference is instead of a 20k resistor between grid 1 and ground, I used a 100k because it worked a little better with a 100k, I also tried with a 200k but the flame became rather noisy making squeaking noises.
With all that said, although I can now get a plasma flame about 1.5 cm long, it works at around 17MHz and my GU-50 doesn't even come anywhere near close to red-plating, my output falls well short in comparison to what the "tesla coil" on the website could do!
Here's a close-up of what I am getting, it's cropped form the bigger picture, but you can see it more clearly.
So here's where I need advice ... How can I improve my output? Even if I can only get half of what he got that would be good. Also this thing interferes with my camera like crazy, I managed to get lucky and take a picture, but as for shooting a video forget it, My camera stops recording as soon as I turn my coil on! Also it knocks out my computer's mouse, makes any stereo that's nearby emit a loud buzz though the speakers, and sometimes it makes my clock bleep. So how can I avoid it interfering with everything so I can actually get some video footage recorded? I tried wrapping the camera in foil with just the lens poking out and connecting the foil to ground but it didn't seem to help.
Registered Member #54724
Joined: Mon Mar 30 2015, 01:12AM
Location: Livermore, CA
Posts: 7
Please post a re-drawn schematic with conventional schematic annotation such as "R1, C1, L1, etc.," plus a clear photograph(s) of the circuitry (not operating, so there's no interference). That may help facilitate discussion.
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Advice on how to improve the output of a HF base fed VTTC?
