New Jewel Thief "Resonate LCR Circuit" Much less energy draw....

[sirmikey1]

Hi All,
  Found this on youtube, a resonate LCR Joule Thief circuit using one coil and an NPN and PNP transistor.  I's showing much less energy draw of the normal jewel theif.

Here's the video, and I've attached a schematic to this post.
http://www.youtube.com/watch?v=EzlMHlnK2DM

SM

[Tink]

I very much doubt a white led will run with just one loop of wire.
I think the red led lights up because it is a direct connection to the 1.5 Volt source (red leds do light up at about 1.5 Volts you see!).

[jadaro2600]

Most red led's the size he's using will run without the transistors at all.

On top of that, he seems to have things under the piece of paper, obscured from view.

[mscoffman]

  Found this on youtube, a resonate LCR Joule Thief circuit using one coil and an NPN and PNP transistor.  I's showing much less energy draw of the normal jewel theif.

The Oscillator circuit is called a Complementary Transistor Multivibrator from digial fame.

:MarkSCoffman

[jadaro2600]

I just tested the circuit, it does work, I was able to light three led in parallel with it. ..I also used a diode and capacitor to measure voltage gain, the readout was 3.5V, it's consuming 8ma.

The led's didn't get very bright, but it does work - however, I had to drop the resistance down to 1k on the main resistor, and since I wasn't able to find 100pf cap, i had to use a 400pf, ..also, brightness seems to fluctuate with capacitance. ..more not always better.

Still not too sure about that one loop thing myself.

I think he's fooled himself with the red led.  I believe it will light without this circuit on a 1.5v source.