Joule Thief

[Groundloop]

I guess there is still an error as both collectors of the 2 transistors will need to be connected together...
and NOT VT1 to the powersupply cap !

Regards, Stefan.

Stefan,

No, I think he got it right. I have the collector of the 2N2222 directly to the plus rail.

GL.

[NickZ]

   Stefan and All:
   I normally have used the TIP 3055 transistor on several of my versions of the Lasersaber 2.0 or 3.0 versions with good success. That transistor which is sold by Radio Shack and is really an MJE 3055T, according to the info on the transistor itself, written right on it.
   The diagram of the list of the MJE transistors that are in the previous post above is the view from the back side, not the front. So, the B and E are really reversed if you look at it from the plastic front  view. That transistor works as well as the 2n3055 but will heat up in a similar manner, so it will also need a heat-sink when using 12v or so, and higher wattage bulbs for a load.
  To find the best place to connect the outside earth ground, just try it on different point on the circuit, and watch which point gives the best increased output brightness on the bulb. I place my ground connection on the transistor metal body on both the 2n3055, or the MJE 3055T (TIP 3055).

[gadgetmall]

Hi Groundloop,
many thanks.
I will try to hook another transistor to the base of the MJE1100 so I will
have a 3 transistor Darlington...
I still have a few smaller NPN transistors here...

Well, does anybody know,
where Laserhacker does connect this graetz brdige rectifier in his new video ?

It is very hard to see in the video as he pans back and forth....


Also I had seen 2 videos from a guy on youtube, where he just used 2 different metals to power some kind
of Joule Thief...
In his second video he used his window metal  frame and a ground rod outside...

But I don´t find this video anymore...
He did not use a battery at all and he said, he could power his coil this way....
He was using a transistor to switch it and looked simular to a Joule Thief circuit...

DOes anybody still find this video on YOutube ?

Many thanks.

Regards, Stefan.

This is the circuit for 1/2ua . It will power up with two different metals in your hand .needs only a fraction of a microamp not milli MICRO. I posted the circuit some where in 2009 ..

[gadgetmall]

I guess there is still an error as both collectors of the 2 transistors will need to be connected together...
and NOT VT1 to the powersupply cap !

Regards, Stefan.

Yes the bridge circuit looks wrong. Start with  the original one then we figure out where the Bridge went . The ground is either on one of the secondary windings on LED or output . I got almost full bright modified CFL and I need to check my leds to see if they still work on the grid .. Whew.

[wings]

There was just posted a circuit diagramm here:

http://laserhacker.com/forum/index.php?topic=70.msg634#msg634


I copy it here also for all to see directly here:

it seems that through the diodes the circuit recover energy due to capacitive/inductive coupling (stray capacitance) between the ground and electrical devices ..... similar to plasma globe effect , the difference here is probably the large emission frequency band that require less capacitance coupling.
a fast diode bridge can improve that effect.