Joule Thief

[dasimpson]

ok i am cheating here i have got my joule thief to pull no more then 7 - 10 milliamps by putting a resister in line with the postive feed ok the led on the secondry is dimmer now then it was befor what i am hopeing is more winds will bring this brightness back up what do you think
btw i used a pot to ajust the resistence will i got the ampage draw below what i wonted then mesuerd with the multi meter then checked all the risisters i have for a similer reading
ok scrap that 10 times thew turns and same brightness oh well 100 milliamp draw it is then just hope it dosent raise to much with each led i add

[gyulasun]

Bill,

I do not know them, nor their prices but they have decade resistor boxes:

http://www.ietlabs.com/decaderes.html

Similar boxes exist for capacitors too, but you could also easily assemble such boxes on component prices: you need some ten way rotary switches (Yaxley) and resistors and a box. Regardless of member dasipson... if you need such boxes.

rgds,  Gyula

[jeanna]

btw i used a pot to ajust the resistence will i got the ampage draw below...

See what gadgetmall did.
He put a capacitor on the unused end of the pot and joined the other side to one of the sides.
I am not exactly sure.
He then was able to use a 50K pot and get bright light on only 3 or 4 mA draw.
I only recently learned this, and have not tried it except in a flaky way.
When he first described it, I did not follow what he was doing, but I am sure it is a very worthy direction to go.
And if you get some way to describe it, please do, since this is something almost none of us have explored.

thanks,

jeanna

[dasimpson]

it is knowing exactly were he put them ius the problem with a diagram i could proberbly understand but i am very limited on parts i try and salvage al i can as i have as much money going out as i have comming in i think my main mistake was buying bc337-25 transistors insted of the 2n3904 but my intention at first was to build single joule thief and not the way of secondry winds and thing i guess when i get a little cash spare i will order some 2n3904 then my work would be on the same curcuit compnents to what most of you use

i know this wrighting must look like a load of rambling with no . and , etc but i am dyslexic and have alot of problems with wrighting and spelling but hay albut albert einstein was also and look how he did

See what gadgetmall did.
He put a capacitor on the unused end of the pot and joined the other side to one of the sides.
I am not exactly sure.
He then was able to use a 50K pot and get bright light on only 3 or 4 mA draw.
I only recently learned this, and have not tried it except in a flaky way.
When he first described it, I did not follow what he was doing, but I am sure it is a very worthy direction to go.
And if you get some way to describe it, please do, since this is something almost none of us have explored.

thanks,

jeanna

[jeanna]

OK that is fine
(dyslexia makes you more flexible of brain IMHO  )

Here is a copy of one such diagram from gadget who also called himself fusionchip.
If you look at the base resistor you will see the pot with the arrow.
It also has a cap symbol.
This is where he put the cap on the non used leg of the pot.
I was wrong. the mA were 0.43mA or micro amps... really low!!

BTW, you can expect the amps draw to LOWER when you put more lights on the secondary... just a little piece of magic to inspire you.

Here is the pic.

jeanna