An interesting effect:

http://www.youtube.com/watch?v=2NdGUEqZXko

Quote from: TinselKoala on October 15, 2013, 02:16:41 PM
An interesting effect:

http://www.youtube.com/watch?v=2NdGUEqZXko

Hi TinselKoala, the effect is due to an inductive coupling effect. The JT circuits by their very nature are rich in harmonic content and capable of radiative transmission. some of the more powerful circuits can transmit a fair distance. Try matching as close as possible the two circuits inductive properties and by connecting the led directly across its inductor you may find in close proximity it will light up. a few years back I demonstrated in this thread how this could be achieved. Purely as an experimental venture I managed to transfer the energy from a large inductive coil directly through a 9" brick wall to light two led lanterns outside my home. Similar principle used for charging small appliances without the need to connect via wires. One word of warning however, inductive magnet waves can have strange effects and may not be safe at higher power levels!
Interesting experiment none the less... Hey, I like your close peg adaption and 2n3055 mounting method under that inductor, very well thought out. Kind Regards Crow

  Wireless Inductive coupling, yes. I use leds on small inductors near by all my devices to show me when the oscillator is running, even if the bigger bulbs may not be lit yet.
Here is a Joule Ringer type circuit running on a cell phone charger wall adapter, lighting a partially lit 60 watt Cfl, and lighting the neon av plug, as well as the single led on an small inductor. Notice that there is no shocking, while touching the lit neon bulb.

Nice! What's the transistor there?

Yes, lighting the neon without shocking is pretty neat. Here's an old video where I show the output from a special TC system, lighting a neon with one wire, burning my flesh (see the smoke!) without shocking me, and then I light up some LEDs in series with the same neon. This is using the Gotoluc h-bridge circuit to drive the TC bifilar primary.

http://www.youtube.com/watch?v=BwbdvDms0Bk

  Most any npn will work, or pnp with reversed polarity. I think that was a 2n2222A,
I normally use the 2n3055, or TIP 3055 on the Ringer circuits.
For some reason the 2n3055 seam to be easier to fry. And I've burnt my share of them.
Lasersaber buys lots of 40 of the 2n3055 at a time. So, I guess he must also go through them pretty quickly.  Can't be afraid to experiment though, good thing they're cheap. Ha!

  Sweet little circuit you showed there TK, I like that neon in the center of the coil. I've built something like that but using leds, and placed the whole circuit in the center of the toroid. Would be nice to have something like that neon circuit self running though.