Joule Thief

[hartiberlin]

Well done to all experimentors, Gadget, Sohei, TK , Groundloop and Hoppy and all the others...

Did anybody yet try to see, how the waveforms look at the primary of the transformer
at the Lasersabers Crossover circuit ?

Isn´t there the chance to blew the driving 2N3055 transistor from the backspikes when the transistor
switches off or what is happening there ?

I guess we really need the right transformer to get it all to work like in Lasersaber´s setup.

I guess this is really the key to the success..

Have to get some new transistors first next week, so I can better tinker with it and
have to wind another 100 turns on my toroid core to get 200 turns, as I only have 100 turns
as the secondary.
TK shoed it nicely how to wind such a toroid more easily in one of his last videos... Many thanks for this....!

Have a nice weekend !

Regards, Stefan.

[Groundloop]

I have now tested a number of easy to wind 'open' transformers using ferrite rods and none can meet the performance efficiency of my 'E' core transformer. As Groundloop shows, a high value resistor between collector and base of the 2N2222 (or an MPSA06) transistor can help to provide just enough positive bias to trigger the circuit into action. My circuit will start automatically with a 7W LED but not with a 3W LED.

I cannot get the lasersabre diode and magnet mod to work. It stops oscillation on my setup.

Hoppy

Hoppy,

What is the size of you Ferrite core? And what number of turns did you use?

GL.

[Hoppy]

Hoppy,

What is the size of you Ferrite core? And what number of turns did you use?

GL.

GL,

L=45mm, W=40mm, D=12mm. 20 turns 0.5mm ECW on primary. 250 turns 0.3mm on secondary.

Regards
Hoppy

[Groundloop]

GL,

L=45mm, W=40mm, D=12mm. 20 turns 0.5mm ECW on primary. 250 turns 0.3mm on secondary.

Regards
Hoppy

Hoppy,

Thanks, I will see if I can find one in some of my old computer PSU.

GL.

[gadgetmall]

    http://youtu.be/tdmgDIWtDpM

here is my last one and i let it run all night . It is still fully charged . i trigger mine with a tap from a ground now .LOw input Lasersaber CrossOver Circuit .. I could not get the diode magnet to work but this will trigger with a tap of a ground now so no resistor needed . I let it run all night long and the battery is still fully charged .!  Thats is a 220 volt Led bulb and the power supply is  1.2 vols dc . the Transformer is a little ferrite choke from a computer and wound with 300 turns secondary #26 and 27 or 28 primary of #22 .super glue helped hold the wire from common of the edges and tape over it .   the transistors are MPSA05's