Joule Thief

[TheNOP]

I hope this makes sense in light of your theory, or will add information necessary to augment it.

thanks for the confirmation jeanna.
yes, you have demonstrate that that theory is true.

since the transistor is conducting for a longer period of time, it is normal that the frequency drop lower.

[xee2]

@ jeanna

I first made the 5T into the collector coil and the 8T wire into the base coil. Then I read off the 40T secondary to get the oscillation frequency and voltage-out through the secondary.
222KHz
52V
220 ohm base resistor

then I reversed them so the 8T became the collector coil, and 5T the base coil.
125KHz
57V
220 ohm base resistor

Thanks for testing. This seems like an important test to do. Your results seem to match my theory. Increasing the turns on the base coil will increase the frequency and decreasing the turns on the base coil will increase the power produced by the pickup coil. Good work. You seem to be getting better at using your scope also.

Also, as you showed with your previous tests, increasing base resistor value increases frequency and decreasing base resistor value decreases frequency.

[jeanna]

Well how nice,

I am glad this test helped. I am also glad you were there to interpret it!

This is a picture of one of those 2 tiered scopeshots.
You cannot see the details but you can see the quality of the wave.
On the left border there is a short blank area. just above this you may be able to see a little dot. That is the x axis. So, it is a very little low.
It seems that this is one benefit of the 2 tiers.
I can barely remember what I was thinking I would do with the 2 tiers. Whatever it was, I don't think it worked, but something else has come of it.
thank you for your help,

jeanna

[xee2]

@ jeanna

You seem to be pretty good with computers. Is there a way to send the scope screen to the computer? Most digital scopes have this feature. That would make it easier to post better scope shots.

[jeanna]

Ah, that is a different model scope. I need to get out the xo laptop and see. Those pics it took were so terrific. But the glare is so deep, maybe not. Oh well.


Here is a drawing of a new connection I discovered today. The lights are very bright and yet the volts dropped to 17 from around 40. It is the frequency that went up. This time it is 285KHz. The wave looks nice like the last one too.

Remember,
only 1 transistor 2N3904
Base 220 ohm
on first tier with the Widow.

Second tier has only MK .8 wires and lights

...
removed some extra text - no good idea
.....

jeanna