3v OU Flashlight

[TinselKoala]

Wow! Can I have the winding details of your coil. 

Sure. I used a ferrite core from a TV flyback transformer. Made in China, no doubt, which is on the same land mass as Russia.

I made a bobbin using a brass tube for the center and a couple of plastic discs for the ends. The tube fits nicely over the ferrite core. I then soldered one end of some #27 magnet wire to the brass tube, and wound a bunch of turns onto the form. The inductance of this winding is about 6 milliHenry. Then I took some aluminum duct tape and wrapped that around the first winding, electrically connected it to another piece of #27, and wound the second winding over the aluminum tape. This second winding measures something like 24 milliHenry. Then I put another layer of blue masking tape on the outside.

To get to the stated values on the schematic I would have to use a much bigger coil form, or much smaller wire, neither of which I have on hand. But Akula showed this setup working with just a few turns of heavy wire on his flyback ferrite, I thought.

[TinselKoala]

To avoid confusion.... don't even _think_ about testing your circuits with a small battery to see how long they will run! That would just be trolling!

[verpies]

Just for that, now you have to watch this.
http://www.youtube.com/watch?v=NZFSnLgXfQE

It was always obvious that a button cell powered boost converter can power two LEDs for a long time.

...but what was that thing at 8:30 ?!

[MenofFather]

Я не утверждаю, что так как у меня -правильно.... Напротив я за поиски нового, так как не получилось выжать больше чем на видео.


Я думаю на сердечнике из титаната бария попробовать, у меня были хорошие опыты с ним.

Я пробовал, как только мог, самозапит не получаеться, мне было бы хорошо хоть какой самозапит зделать, поэтому информация, сколько витков было на какой катушке, было бы хорошо и ленты медные замкнутые или не замкнутые знать бы.

[d3x0r]

It is the ground of the probe. You see him disconnect it later on in the video. The ground on the other probe is not connected!

He also has a lead plugged into the external trigger on the scope.

on rigol scopes the ground is not isolated, so connecting one is the same as connecting both.  (and most inexpesnsive digital scopes)