Joule Thief

[jeanna]

How long does it run on a fresh battery ?

This is a AAA and a TIP31. I expect this to run for 1 1/2 hours max.
My AAA NiMH batteries are 700mHA and they are old.
More and more I believe the length of run time is about the transistor more than what the secondary can produce.
That said, it is impossible so far to light a fluoro tube with a single little transistor.

Well done with fluoro, is it lit as bright as grid power??

Thanks freepow,
It is as bright as the first moment it goes on when used on the grid.
These fluorescent things get brighter when they warm up, and the jt secondary alone does not make it get warm.
If I can add a cap and resistor to make it get warmer, it might be brighter.

If anyone can tell me how to do that without taking so much the light goes out, please explain your ideas.

[innovation_station]

here is a picture of the lasers i dugg out 1 v 1mw ..... 

if i can amp electricty ..  i with EASE  can amp a jt driven laser !! those are for later ...  the gold lol  was some kind of bronze ...  so i bet NEO ZAP IS MY GOLD WITH THOSE ... ; )

I finally got the crap out of my work area!!  now i can start to build agin ....  but im not sure how much more i care to share.......   hummmmmm

what have i ever gotten ? for doing so ....  0  yep  ....   ooooo  the puck always ends up in the net!

some day!  you figure this all out ......  someday!

http://www.youtube.com/watch?v=H6pODq8_FxE

H



lol

last pic my npn 18 board and my npn pnp 9x9 and my tip modulator board is under the stack!

: )

[guruji]

Hi did anyone tried to put the secondary to the source battery and see if the source charge itself?
Thanks

[jeanna]

Hi did anyone tried to put the secondary to the source battery and see if the source charge itself?
Thanks

All my leds that were also on that secondary went out when I tried that.

@ALL,
I have just discovered that all my transistors are half broken.

How do I say this?

If the transistor is set to run a very normal and well known toroid, the oscillations refuse to start until the base resistance is down to less than500r.

I just got an order of tip31 in yesterday and they appear normal, that is, they still turn on at higher resistances.

I had a lot of trouble last week and one by one I have found that most of my components are not working right.
I have no idea what this is, but I report it in case everyone/anyone else is struggling, and if there was a flare of some kind that half blew my components.

Anybody else?

jeanna
----
I better get on with the mag amp eh?

j

edit
I just went through all the transistors in the storage box,
Every one in plastic that was here before monday is seriously damaged.
The ones in the can's seem fine.
I have 3 germanium in cans from gadget
and about 8 2N2222A in cans from various places
2N3055 with leads on it seems fine too.

Fine means it turns a basic joule thief on when the base resistor is set to 1k ohms.

---
Even the original TIP3055 from RS that blew me away it was so good but never managed to get into a circuit is half gone.

This is disturbing, to say the least.
I live in a faraday cage except for the windows. My supplies are in the window.
They are all in metal cans, but I don't usually close them up.

I wonder if my experiments are doing this?
or
if something else?

[Mk1]

@jeanna

http://en.wikipedia.org/wiki/Magnetic_amplifier
http://www.toshiba-tmat.co.jp/eng/list/am_core.htm