what happens between a teslacoil the battery the incadescent bulb and the ground

[woopy]

Hi everyone

some days ago Tinselkoala made an experiment with his Teslacoil, where he could light a 120 volts incadescent bulb from one of the battery terminal (no matter + or-) and his finger or the ground.

here the 2 TK's videos, thank's for sharing.

https://youtu.be/WV3posVDqJs

https://youtu.be/S_URR6Bk9cg

As you notice the bulb is much more strong on the battery terminal than the same bulb connected to the main grid.

If i have correctly understood,TK sayd that he think that the power comes from the battery, but "what is the circuitery ?"

So as i got a mini Teslacoil, i replicated the experiment and i also could light a 220 incandescent bulb connected on one terminalof a very small (450 mA) 6 s (22 volts) lipo, and the ground of my grid.
My bulb is far not so bright as TK's, but my Teslacoil is also much smaller and is a very cheap singing coil  from China and is perhaps not very well tuned.

Here the video

https://youtu.be/ZDFEevnkuq0

As you can see on the scope, the voltage around the Teslacoil increases a lot when the bulb is connected between the terminal of the battery and the ground.

As you can also see at the end of the video, when i approach my finger on the battery, the bulb fades ? As if my body mass is in opposition with the ground of the grid, and cut the effect ??

I tried to measure the current with a clampmeter, but no way the frequency is far too high (about 3 MHz), so i tried the analog ampmeter but i doubt of the value which seems to show less current when the bulb is connected.
Today i retested without the ampmeter, and the result is even  better (probably less resistance without the meter ).

Just for info, i was holding the positiv lead to connect to the battery (the bulb was not connected) and due to a bad insulation of the crocodile clip, i got a nice but painfull burning on one of my finger. So i suppose that i played the role of the bulb in this particular case ??

Another info i did, as TK did , connect the bulb directly to the + and - of the 24 volts battery, and the bulb'  filament is nearly rosa.(almost nothing)

I have no idea of what is going on in this experiment.

So my question to TK and all of you, how can we explain this effect ?

Thank's

Laurent

[gotoluc]

Bonjour Laurent

The below addition should work for accurate power measurements. The capacitor value may be smaller but must be large enough to maintain a flat DC Voltage across the current sensing resistor (CSR) which is checked by your scope.
You can use a 1% 1 Ohm or 1% 0.1 Ohm as CSR.
If the voltage is flat DC across the CSR then your amp meter should measure accurately so all you need to know is the battery voltage x amps = watts

Let me know if you need anything.

Regards

Luc

[gotoluc]

Laurent

I made an alternative circuit connection for your bulb in case the capacitor filters out the effect.
However, looking at it now I don't see what difference this would make but worth a try if it does.

Luc

[TinselKoala]

1. The SSTC and experiments shown in my videos that Woopy linked above can be _dangerous_. As Woopy already found out, you can get painful RF burns from touching the wrong place and/or the wrong way. There is also an unresolved issue about X-ray emissions from the bulb experiment. I've stopped doing this experiment until I can learn more about the possible X-ray emissions.

2. This particular SSTC circuit is auto-resonating by virtue of E-field feedback through an antenna. This means the coil will automatically snap into resonance and will remain in resonance in spite of drawing arcs, lighting bulbs, varying external capacitance around the coil, etc. The resonant frequency of the coil changes from all these variations but the circuit follows the variations and automatically adjusts to keep the coil in resonance and making a strong E-field. I don't know how adding large external capacitance to the primary circuit will affect this feedback system.

3. There is no way that I would connect a DSO directly to this circuit. Don't blame me if you blow out your oscilloscope! You can easily detect the coil's resonance simply by suspending a scope probe 1 meter away from the coil, with a resistor across the tip and ground of the probe, or a bit of aluminum foil connected to the probe. But I would be very leery about directly connecting the digital scope for current measurements, etc. as in the above drawings.

4. I also don't know what effect this experiment has on the batteries powering the coil. I do know that there is a lot of HF noise on the power leads (the little toroid choke I have on the power leads gets quite hot when operating the coil, whether from batteries or from my PSU.) Similar circuits have been blamed for killing batteries. Remember that lead-acid batteries can evolve hydrogen gas when charging/discharging, and this circuit makes sparks and arcs.... And knowing how LiPo batteries can explode, I would not even consider running this circuit from LiPos, at least not inside the house.

So have fun, but play safe and don't get burned !

[ramset]

Recent concerns about these experiments came from here ,as well as possible solutions for protection.

http://overunity.com/15999/the-eric-dollard-lightglobe-experiment/new/#new