3v OU Flashlight

[havuhung]

Hi scratchrobot,
In the video clip, I guess that's a piece broken out of a toroidal magnet speakers? . .

[scratchrobot]

Hi scratchrobot,
In the video clip, I guess that's a piece broken out of a toroidal magnet speakers? . .

Hi havuhung,


I have no idea, maybe or ferrite, looks like he solder on it, maybe he put copper tape on it?
I will try it on different materials, looks interesting to me


It's BaTiO3 (barium titanate).
http://www.ebay.com/itm/Piezo-Barium-Titanate-Ceramic-Material-Silver-Plated-/150750545080?pt=LH_DefaultDomain_0&hash=item23196ec4b8
In the description it says that John Hutchinson made a battery out of material just like this that never needed charging   
http://www.dailymotion.com/video/x1a1c0y_barium-titanate-test_news

More distractions 

[havuhung]

Hi scratchrobot,

Thank you.

[TinselKoala]

This morning's scopeshot.

3.0V input 320 mA
LEDs one blue, one white
flyback ferrite core halves separated by 2mm wooden spacer and tightened down with clipspring
Larger inductance on inverter side, smaller on 34063 side
2.2 pF capacitor across the 3.3 K resistor
very careful tuning of trimpot

Both channels at 2 V/div,   5ms/div horizontal

I'm preparing a video of some interesting things I saw last night, before I changed the LEDs and added the little capacitor.
I'll be switching to the digital scope this afternoon.

I think that the inductances I am using are waaaay too large (about 6 and 20 milliH). I'll be winding another coil bobbin with less wire later on this afternoon. I am now thinking that the 27 and 54 numbers might actually be 2.7 and 5.4 milliHenry or even 27 and 54 microHenry.

[TinselKoala]

Exactly!
Semenihin-77 posted a new video,
http://youtu.be/eac1_pLNhnQ

Nothing at all remarkable in that video that I can see. I don't understand most of what he's saying, but he's using a 1 volt signal of 121 kiloHertz and showing that the LEDs don't light when directly connected to the FG but do light when he has more inductance or capacitance in the circuit.  I have many videos that show the same thing as small parts of other demonstrations. This does not appear to me to have anything to do with the Akula 3v flashlight circuit.

The material does not look like BaTiO to me. But who knows what Soviet surplus barium titanate might look like.