Joule Thief

[NickZ]

  And, when lighting DC type leds, with pulsed AC,  stranger things than that can happen.
As they can become altered in time, and won't work as they did originally.
  That is one of the risks of these homemade inverter circuits, running on different frequencies.

[Pirate88179]

I finally got my JT Power Tube to operate this weekend.  I cheated by removing the AA battery I tried to use for the core and slipped in a ferrite rod.  Interesting to note that when I powered it up, I did my usual test to see if it was running.  I held the HV output leads in my hands and received no shock whatsoever.  (I do not reccomend this method)  I thought that there was something else wrong with the circuit and was going to give up on it again but, I decided to get a meter to see if I was getting anything out of the output leads.

Right next to one of my meters on the bench was a LOA 27 chip LED blub so I decided to grab it and hook it up real fast just for laughs.  Guess what?  It lights up very brightly even though I was feeling no output through my finger test method.

I will post a photo later after work and maybe see if I can find out what the output is.

Is it possible that the voltage output is of a high enough frequency that it does not penetrate my skin?  I have never seen this before.

Bill

[crowclaw]

Hi Bill

The frequency shouldn't make any difference really, if the voltage was high enough you would still  feel a tingle.
Depends on your skin resistance however, it was probably low enough to pull the voltage down when you held the output.

[xee2]

Is it possible that the voltage output is of a high enough frequency that it does not penetrate my skin?  I have never seen this before.

Yes. As the frequency increases, the distance that the energy penetrates into skin becomes smaller. That is why I can use my body as a wire to light a fluorescent tube without getting a shock.

[NickZ]

  But, can you light a 100watt incandescent bulb brightly, using your body as the wire?

  Igor Mosoz has shown that he can still touch the single hair thin output wire that is some meters long, and goes from the induction oscillator inside his house, and goes to the cement back-yard patio, where the ground connection is screwed into the cement slab.   And then Igor lights 2000 watts halogen bulbs, through this hair thin wire, and is still able to this touch this output wire, with his bare wet hands inside a tray of water that is making the electrical connect, and show no shock from any of it.  2000 watts of Halogen   bulbs,  lit!   Low voltage, but high amps,  also not giving any electric shock.
   
  Although what I am about to say pertains more in the Kapanadze/Akula/Dally threads, I think that the idea of what Igor Moroz is doing now,  is a different approach, and also of interest here.
Here's one of Igor Moroz's more recent videos (below), he's working on the idea to reuse or recycle the output power drawn from his circuits, back into the input source (battery/capacitor bank), and maintain a balance going on there, while still lighting kw worth of incandescent bulbs, at the same time. He claims no OU results, yet, and is still working obtaining some more capacitors, to be able to feed back and self run his circuit. 
   But, sounds like he is getting close to it.
         http://www.youtube.com/watch?v=Ji-d_1i6eC0

  He's also got several recent videos to check up on, if interested.