Joule Thief

[altrez]

@jeanna

Permeability (electromagnetism), the degree of magnetization of a material in response to a magnetic field

I believe I am going to try four 2.9 Inch Toroid's. I am going to get them with the fallowing specs 145 1000 5000 and 10000. Then I will test each one to see if there is a difference. I will post all of my findings as well as my test rig.

Thank you for all the help!

-Altrez

[TheNOP]

theNOP,
Half of the people working on this thread do not have a great deal of experience or knowledge about these things.
We are here to learn, and to help each other.
We are also here to share our experimental ideas and results with each other.

i am here for the same reasons.
but you can say that it is less for learning then it is for sharing and the ideas.

Perhaps it is time for YOU to share some of your experimental results with us.
You make it clear that you have already tried and therefore you understand the things we are doing.
Since you have such great understanding I think it is time for you to take a turn and share your experimental reasons for saying the things you say.

i am sharing.
if you mean sharing photos, then i guess i am not sharing much as i have no camera.

my understanding does not come only from my experiments with the jt, i have a diploma in electronic.
it don't wort much today when knowing what i went through since my school days but anyway...
suffice to say that i didn't worked in that field at all all those years.

For instance, what experiments did you design and perform that have taught you about toroids and their potentials.
What experiments have you made with RLC circuits.
Did you have any results?
What (exactly) did you find?

first i learned the theoretical stuff at school.
after the teaching of a new component, we were assigned the basic experiments with the electronic components.

i have PMed you with some experiments that you can do to understand how transformer work.
from where do you think those proposed experiments came from ?
were they not related to the jt too ?

transformer, transistors, RL, RC, RLC are just a few of the circuits or components we were teached.

stuff like:
-what does happen when varying the resistor value.
-what does happen when varying the capacitor value
-what does happen when varying the inductor value

we had the tools to get those values, so, yes, i had results for those circuits.
for me, i came to the conclusion that the theoretical stuff was right, that indeed, what we were teached applied to those circuits.

don't you think that if those circuit are also found in a jt, then the same basic rules apply to them ?

I am talking here about joule thief related circuits.

if you can't see that basic electronic circuits do apply to a jt circuit then i fear i can't help.

Have you made a joule thief circuit?
Does it light up your house at night?
Did you use a cap at the base?

yes, more then one.

yes, sometime, it is on for time based experiments, so not always. my goal, for now, is not to illuminate my house.

some, yes. some, no. depends what i was testing.

what transistor do you find works best?

i don't really know, mine "best" was a c2120.
all transistor should work, but it must trigger at the voltage you are using.
my problem is i don't have any of those low base voltage transistor to work with 1.5volts anymore.
the one i have work with minimum 3~5 volts to the base.

How many turns on each half of the primary jt winding do you prefer and why?

i have no preferences.
it is not a preference, it is a must do thing.
it all depends on what components/meterials i am using.

for low in iron cores(10+) i put more turns then for laminated iron(1+).
but, for low in iron cores, i also change the frequency at the transistor base to make it higher.
same for laminated iron, but then, i make it low frequency instead.

All taken from YOUR experiments, I mean.

for everythings i am saying in this tread, i am trying to include only what can be proved.
be it stuff i learned in my young time, or from any experiments i have done, with a jt or not.

and if i am wrong in something please feel free to rectify me, i will be thankfull.
i am not perfect, but i am trying.

[Pirate88179]

@ TheNOP:

Thanks for sharing your background information here.  I have learned a lot since we all started this and, I know there is a lot more to learn.  I had a decent overview knowledge of electronics from my machine shop days but, nothing like the real nuts and bolts stuff I now know and am learning here.  If someone told me 2 years ago that I would now be attempting to learn to use a scope, I would have thought they were nuts, ha ha. I have to agree that the laws are laws for a reason, because they hold up.  Does that mean there are no loopholes or exceptions?  Maybe, possibly, doubtful, unlikely....I don't know.

I just read somewhere either in my electronics book, or on here somewhere that Ohms law stops working when a magnetic field is introduced....do I have this correct?  Maybe it was from one of my on-line electronics lecture series....if I have this wrong, let me know and I will correct this.  Otherwise, I will try to remember where I read this.  If not in a magnetic field, there was some conditions where Ohm's law no longer works. (I hate when I can't remember stuff exactly)  Thanks, I appreciate your contributions here.

@ Wilby:

Don't leave us man, we need guys like you.  Possibly there was a misunderstanding due to the language difference here?

@ Jeanna:

I like the direction your work is going and soon, I will begin attempts to replicate.  I think I have most, if not all, of the stuff here to do it. I even have some 2N222's to have a go with also.  Take care.

Bill

[TheNOP]

@Pirate88179
the "laws" are not how nature work, they are only interpretations of it.
almost each one apply to specific cases only.

like i sayed, Ohm's law sometime does not apply, but in general it does.
Ohm's law is not the only one that does this.

you can probably verify my saying about Ohm's law and a few others in one or more of those lectures.
http://www.youtube.com/view_play_list?p=C2CEECFD938FD494
those are physic lectures btw.

[hazens1]

Sorry, been away for a while.. Have been real busy at work and other stuff. Got a shipment of 100 LEDs in the mail today and thought I would take a minute and test them. I bought 100x 5mm 20,000mcd 3.6v 20°-25° viewing angle LEDs for $8.99 shipped on Ebay a couple weeks ago. Finally have enough LEDs to test some of my newer circuits. I quickly put 43 in parallel on the Pickup coil after the rectifier on my older 3/8inch Green/Red Christmas toroid. I think it is a 20-20-80 wind if my memory is correct. 26ga on the Base and Collector and 30ga on the Pickup. It could do more LEDs, but I ran out of room. Circuit uses a 2n2222 with a 10k ohm parallel with a Blue Radio Shack bulk pack cap labeled 561-1kv. Input draw in the following picture is 1.35v at 17ma. Ignore all the crap on the Left breadboard, it is not hooked up and I was too lazy to remove it from previous experiments 

Also, the brightness of the LEDs that are not directly under the camera are misleading since these have such a narrow viewing angle. Viewed directly above each LED is as bright as the ones in the center of the picture. All the LEDs are fairly bright. Probably as bright as if they were being driven off of 10ma direct DC current at 3.6 volts.