Joule Thief

[xee2]

Slayer007-k1zm toroid circuit test with 25T-250T toroid.

[innovation_station]

anyone ever take apart a LAPTOP  screen ...  lol 

1500v ..  looks like a really intresting transformer in there  : )

lmfao

how many harmonics ?   i will post a pic ...  discovering this ...  im going to take apart another one and  a desk top model ..

i highly reccomend  it !

: )

W

might aswell grabb the wifi antenna.... lol 

[MrMag]

When I tried parallel transistors both elements of the neon lit up so output was AC.  Why sometimes it is AC and sometimes not I do not understand. I do not think it is the number of transistors. More likely it is how the wires are laying on the bench (how the circuit is capacitively coupling).

I have a feeling that using the two transistors is giving you enough (higher) voltage on the secondary during the "on" time to light one side of the neon and then the other side of the neon is lit with the BEMF. Using the single transistor will not give you the same voltage.

All you need to do to prove this is try to hook up the two FL tubes with only one transistor as in your first diagram (on this page). If you can lite them with two transistors and not one, I guess it will prove that you are getting a higher output and not necessarily AC vs DC. Just higher pulses on the + and - side.

[jeanna]

Hello anyone !!!!

Please will someone answer me...

Has anyone been able to make a Joule thief powering either LED's or a very bright light bulb, 
bright enough to fully light up a room completely where the whole room is lit bright ?

please show me...

Hi freepow,

I have been living in my travel trailer for the last few weeks.
I am very pleased with the light I am getting.
I made a video to show how bright the trailer is with just a few lamps, but alas, the camera ignores the cool light and even though my eyes can see very well, I cannot show you.
I do have a picture of the front of the trailer with ONE joule thief connected to 2 led lamps that looks true to the light in the room.
I can read or do anything I want in this room.

I did not take a pic of this jt with only 1LoA  leds bulb, because I think it is more impressive with 2 lamps, so here that is.

jeanna

edit.
Bye the way, this is not made with that large specialty toroid.
It is made with a  7/8" inch (0.86mm)  toroid and uses a TIP31 transistor.

[Pirate88179]

Jeanna:

That is a beautiful site.  I knew you would be the one to answer his question showing your lights.  That is really great.

Very well done!

Bill