Joule Thief

[jadaro2600]

I'm wondering If a higher frequency becomes more sensitive to interference in the toroid.  Isn't it reasonable to deduce that a higher frequency will have less current from the primary flowing through it?

I think it is funny you ask, jadaro.
...
I do not why you say what you do about stray inductors... so I will have to see what naudin says.
...
jeanna

By 'stray', I should say strategically placed.

You may also note that the extra inductors will pick up 'signals' from the toroid or the mandatory inductors... placing them at 90 degrees to one another should void this, or make its interference negligible ..without a toroid, placement is obvious, but with one, an obvious placement becomes more non-obvious.

I just had an interesting thought about the pre-fab inductors, placing two as normal and one off the emitter may result in a higher junction capacitance across B-E; I wonder what this will do.

( off to test )...and this seems to nullify the process unless I use a very small inductor.

[xee2]

@ jeanna,

I see the diode in your diagram.
Is that needed for the light to work?

Yes. Bulb does not light without diode. I am not sure why.

I have not tried adding more bulbs.

[jadaro2600]

@ jeanna,

Yes. Bulb does not light without diode. I am not sure why.

I have not tried adding more bulbs.

The light bulb, is it ~3 ohms at rest, or is it ~3 ohms when lit? ...the resistance should go up when it's lit ( regardless of the what value the initial resistance is ).

[xee2]

The light bulb, is it ~3 ohms at rest, or is it ~3 ohms when lit? ...the resistance should go up when it's lit ( regardless of the what value the initial resistance is ).

3.2 ohms cold.

[jeanna]

I found some K values.
xee2, Is the K the same as the u?

oops mixed cm's with inches

edit:
biggo K= 4935
Tor-23 K= 840
Tor-61 K=6140
Tor-53K=9150

jeanna