Joule Thief

[Mk1]

@stprue

On mine i use 4/4 , but that works on my toroid , i don't know about yours ...

Mark

[xee2]

@ stprue

The first is how I think gadgetmall was doing it. The second is how I have been doing it. I am not sure which works best.

[stprue]

@all

Cool site

http://www.rmcybernetics.com/shop/surplus-science-lab-equipment.htm?show=hv#A41

[jeanna]

@ jeanna

Here are test results. I think I have said at least 3 times that this is not a good choice of circuits if you want to maximize time tube stays on so I do not understand why you wanted me to do this. The tube was still fairly bright at 9 hours (1.06 volts) and stayed fairly bright until about 0.8 volts. After that it started to dim quickly and was just glowing at 0.66 volts and went out at 0.64 volts.

I cannot imagine what you would think a good circuit would do, if you think this one is not good.

Mine stays on for 5 1/4 hours maximum.
Nobody here has done that test and reported it, except for me. 

Thank you for actually doing this test.

I am now not the only person who has actually tried it out.

I wanted to see about the thin spikes.
at 80 turns you have very thin spikes and you not only got the light to turn on, but you got it to stay on for far longer than I did.
This means the thin ugly spikes are just fine for lighting lights.
It means the 'duty cycle' doesn't matter at all.

You don't know why I want to see someone else here making an effort to have a real light be able to light in a real time situation?
OK , so then I thank you even more for doing this and not getting why I think it is important.

BTW, you mentioned that you got it to start by touching one leg of the secondary to the neg of the battery.
Did you keep it there, or just touch it once?

And, the circuit you drew has an added 200uF battery cap.(up from 100uF) Did that help?

thank you,

jeanna

[stprue]

@ stprue

Thank you kindly xee

I want the circuit digram maker you have!  Was it free?  TinyCad has very thin line and other stuff I don't like about it.  Do you know of a better free app?