oneTesla

WOW, that is all I can say. I am Impressed !!!!

The little guy is next to his Big Brother built about 10 years ago, but it is
of spark-gap design. The music output of the OneTesla is the Novelty and it really has a very
significant spark length for its Diminutive Size !

Only had the OneTesla running at 50% power Fixed, and low power with the SD card.
Interrupter and everything works fine..

Update:
All is running FINE.

Has anyone tried a Vertical Breakout wire rather than Horizontal ?
Any problems ?

Regards,
Alex
Orlando

wow, very nice build on the rsg coil!

alexp wrote:Has anyone tried a Vertical Breakout wire rather than Horizontal ?[/b]
Any problems ?

Im going to try this on both TS and TinyTesla, im using a aluminum spike i machined up, hoping that it doesnt add to much top load capacitance, sucks we cant adjust the primary turns to counter it.

The Tiny tesla will auto tune, but a increase in topload capacitance might result in flashover, currently adding many layers of varnish to my secondarys.

http://i79.photobucket.com/albums/j125/ ... 7738_o.jpg

I observed there needs to be a several inch long length to the 'stinger' or I had multiple breakouts on the
toroid. And you are correct on the 'tuning' - making it too easy is not always the best option.
The strange 'reverse spirals' on the top and bottom of the top circuit board do not lend themselves to trimming ..

On the large coil, it took time to find the 'sweet spot' on the primary .. within a 1/4 in or so, and that pri
has an OD of 15 inches ! ..

I think the intent of using #40 ga wire for the secondary of the new OneTesla design is to lower the Q of the coil by 'adding' 780 ohms of resistance ( via the wire ) to make the coil less susceptible to changes in its environment and have a better chance of 'working the first time' by broadening the resonance - and probably at the expense of performance.

Nice Collection of coils etc !
Is that a series of gas tubes in the plexi rack ? Buy or Make ?

I just used the brush-on polyurethane - two coats seemed sufficient.

Will not just changing the position of the primary windings (downward) on the Tiny Coil adjust the coupling and alleviate the arc-overs ? Or maybe reducing the # of turns by a fraction ?

Alex



Im going to try this on both TS and TinyTesla, im using a aluminum spike i machined up, hoping that it doesnt add to much top load capacitance, sucks we cant adjust the primary turns to counter it.

The Tiny tesla will auto tune, but a increase in topload capacitance might result in flashover, currently adding many layers of varnish to my secondarys.

alexp wrote:I think the intent of using #40 ga wire for the secondary of the new OneTesla design is to lower the Q of the coil by 'adding' 780 ohms of resistance ( via the wire ) to make the coil less susceptible to changes in its environment and have a better chance of 'working the first time' by broadening the resonance - and probably at the expense of performance.

Nice Collection of coils etc !
Is that a series of gas tubes in the plexi rack ? Buy or Make ?

I just used the brush-on polyurethane - two coats seemed sufficient.

Will not just changing the position of the primary windings (downward) on the Tiny Coil adjust the coupling and alleviate the arc-overs ? Or maybe reducing the # of turns by a fraction ?

Yeah they are, bought from china, all the inert gasses and then some

Moving the primary down on the tiny tesla will lower the coupling but not enough,i just ran JavaTC and found the coupling is sitting at almost 0.5k the recommend coupling is 0.128k! My measurements are from memory so not exact.

Moving the primary down so far that it isnt wound over the secondary at all still brings the coupling to ~0.3k

Increasing the diameter of the primary to a whopping 26cm will bring the coupling into the right coupling range but thats quite big compare to a 9cm secondary!

Fiddy wrote:Yeah they are, bought from china, all the inert gasses and then some

Moving the primary down on the tiny tesla will lower the coupling but not enough,i just ran JavaTC and found the coupling is sitting at almost 0.5k the recommend coupling is 0.128k! My measurements are from memory so not exact.

Moving the primary down so far that it isnt wound over the secondary at all still brings the coupling to ~0.3k

Increasing the diameter of the primary to a whopping 26cm will bring the coupling into the right coupling range but thats quite big compare to a 9cm secondary!

Those are a very nice set of gas tubes

The k value recommendation doesn't apply for the tinytesla in this case - it is afterall a conventional SSTC. If you're worried about the primary and secondary being so close together, I'd simply wrap a thick clear insulator band around the bottom of the secondary (e.g. vinyl or something) and wrap the primary around it. The coil will be fine. IMO the primary coupling is a bit high - it could probably do with a wider diameter primary.

Anyone ever use a heat shrink plastic over there secondary coil?