Joule Thief

[dog812]

@hazens1

Wow those are beautiful coils. I wish i wasnt limited to a 1/2 inch torrid, which i am in my application.

[jeanna]

Lets race for the retroalimentation of the joule thief first.  We have the voltages attained already.
Remember this is just my opinion and I could be wrong.

Jesus

Hi Jesus,

While I tend to agree with that, I must remember, so I am reminding you also, that we all have different interests which are driving the ideas and inspirations that we are coming up with.

When we put them together, we will have the whole picture and the whole invention. (indeed many inventions!)

I believe this can best be accomplished only when we act from our own personal inspiration, because THAT is the source of our creativity.

The help we are constantly giving each other, is how I picture an earth paradise. This is my personal image on it.

thank you and everybody,

jeanna

[jeanna]

always keep an eye on the frequency when playing with caps at the transistor's base.
get it as high as possible while looking for the best output voltage.
then you will know what is the best frequency for that specific toroid.

Your suggestion looks like a good one, but I am not sure what you suggesting for me to do.

When you say

get it as high as possible while looking for the best output voltage.

Are you saying to change the frequency by changing the number of turns?
Are you saying to change the value of the cap when you say get IT as high as possible?
Perhaps you are suggesting thai I should be reading the scope at a different frequency value?

if you notice, not only the trace has change in the pictures you posted, the frequency changed too.

Yes, and this is one of the many changes that are happening together that are making my learning how to use my new scope more difficult. (since I still can't figure how to see the dc of a battery!)

What do you mean I noticed the frequency has changed too?
Is it this:
I have the frequency set to 2.4KHz. This is the space of time between the 2 vertical markers.
In one circuit the number of pulses is more than the other. Is that the frequency change you are talking about?

I thought I had all these things worked out. But your questions are making me unsure that I have.

...

for each applications use the most appropriate materials and components...

I will have to leave that part alone for a while. I will return to it for sure.

Just for clarity,

when playing with caps at the transistor's base.

jadaro's drawing had 2 caps.
My little test that produced the second scopeshot, was made by adding a 104pF cap across the Collector and Common. not at the base where the resistor is.
I may have tested the wrong place for him.

thank you,

jeanna

[powercat]

Hi all
I regularly look in on this thread but don't post BUT MyLOW wheel + Joule Thief
from [TinselKoala] at alt.snakeoil 
http://www.youtube.com/watch?v=hYQM8WbCq2Y

cat

[nievesoliveras]

Thank you @jeanna !

Thank you @powercat !

On another video he is making the Mylou wheel to turn with a pulsed coil. So it could be misleading the idea that it is turning by itself and also turning a bicycle dynamo to run a joule thief.
http://www.youtube.com/watch?v=vpcB3JqKAiQ&feature=channel

Time will tell.

Jesus