Joule Thief

[utilitarian]

@all

Disturbing news.
I just read about the proposed Icann Internet control being taken away from America to a proposed G12 which is made up of 2 members of each country as suggested by this article.

October this year is the deadline, Bush wouldn't do it, will Obama do it to appease europe?

http://www.prophecynewswatch.com/May06/0671.html

I think if this goes ahead, then the internet freedom will be curtailed by the interests of the government where you reside.

Australia Gov has a "secret hit list" which has not been published, nor do they wish to let anyone know which web site is on this NAZI list.


jim

1.  I commend your trust in the USA for something, that's unusual here
2.  I frown at your reliance on prophesies
3.  I frown at your wild off-topicness - why don't you go to "we can't handle the truth" or whatever that forum is

[jeanna]

@ jeanna

In the 2nd to top line of your data chart (widow-tele wire) there are two sets of data for the tor23 B5T C8T  40T toroid. One gives frequency as 125 kHz and other as 222 kHz. Both have same base resistor and voltage. What is the difference that produces the different frequency?

Actually that is the widow on that line, and the difference is how it is connected to the joule thief.

The first 4 columns are all connected with the 5T on the base resistor of the transistor.
The second set of columns is all wired with the 8T on the base.

I tried to make the table more chart-like but I see I need to refine that. Maybe a heavier line between the 2 halves of the chart would make it clear?



Thanks for studying the chart,

jeanna

[xee2]

@ jeanna

Actually that is the widow on that line, and the difference is how it is connected to the joule thief.

The first 4 columns are all connected with the 5T on the base resistor of the transistor.
The second set of columns is all wired with the 8T on the base.

I tried to make the table more chart-like but I see I need to refine that. Maybe a heavier line between the 2 halves of the chart would make it clear?



Thanks for studying the chart,

jeanna

My mistake. The chart is clear. I just missed that. Thanks.

[xee2]

@ jeanna

I started to look at pickup coil (even though I still do not understand fully how the base capacitor is working). The pickup coil produces a voltage when the transistor turns on with one polarity and then a larger voltage with the opposite polarity when the transistor turns off. This is one way of looking at these two voltages. But a scope is probably better. Note the diode gets reversed for one set of measurements. The polarity of the voltages depends on which way the two pickup coil leads are connected and thus will be reversed if the leads are reversed. The voltmeter is set to read DC volts.

[jeanna]

@ jeanna

I started to look at pickup coil ....

...The polarity of the voltages depends on which way the two pickup coil leads are connected and thus will be reversed if the leads are reversed. The voltmeter is set to read DC volts.

xee2,
What happens if you put smaller value cap at C? - like 104 or 105pF
I don't have (nor does my Radioshack) any caps larger than 104 (0.1uF) so, I can't answer this myself.

I have been seeing that at very high frequencies the polarity may not matter. At some point as the frequency rises, the polarity of the LED stops making any difference, but below that point, it does.

I am wondering if the cap will help this effect happen at lower frequencies. But. I am sure the cap must be in range to have any effect relating to frequency like this. (I am just beginning to see this, so it may be off base) but this might be easy to do if you have a .1uF - 1uF cap around that you could plug into the base cap "C" spot.

I took out those 12 turns I made on the filter. I am planning to make around 100-120 turns around that core today. It is possible that this will put MY TOROID out of range for any of my own caps. arrgh! --- On second thought, maybe I will make 30-40 turns on that toroid today.

EDIT
Let me add this here,
You are showing lower overall voltage with the cap. This may be a function of higher frequency and not the cap.
I can also see that with the cap --or again, maybe this is because of the higher frequency,-- the polarity is not so severe.
I feel like we are on the cusp of something here.

thank you,

jeanna