Joule Thief

[dasimpson]

i have read to page 270 and i have come to relise they is way to many ppl trying to do to many different things with the joule thief with no clear goals.

from what i have found one of the goals is run from one 1.5 volt battery to as many volts as possible this is ok but what good is volts with out the amps to back them up
ok i understand the cfl light with this unit is deffo a good step but only with we can get the current graw very low this also needs to be easerly duplicated and self made none of the cam units

also has any one built a properly working joule thief battery charger or is the amps just not there for it

i think my main goal is to try and get something from nothing meaning an earth battery powering househould lights or at least chargeing a 12volt battery bank for this porpes i do tend to see alot of rambling about what ppl are doing but with out images this is hard to image or understand ok i do under stand that lots of pics makes a slow site for dail up but i know thay is software dail up users can use to turn images off unless they wont them meaning they only get text based and links for images

[jeanna]

@ ..... and all other experimenters who have experience with a lot of different "cores", toroids or "transformers" in a Joule Thief circuit:

....what is your experience with "screeching" or "singing" of cores, toroids, wires or transformers?
...
The "trigger L1" (going to the base of the transistor) should have fewer turns to increase frequency (e.g. 5 turns). So far "high frequency" has lowered very much the voltage on a secondary L3 no matter what I do.

Greetings, Conrad

Hi Conrad,
The sound can be softened if you add some hot glue onto your windings. It is rubbery and will stop the friction that is causing the sound.

I found that in a joule thief the frequency and voltage are reciprocal...they go in opposite directions.
This is why you can get higher frequency with a higher voltage input to the primary pulse circuit.
If you start at 1.2 v there is just so far down you can go to raise the frequency before the whole pulse shuts down.

So, you have revealed an excellent work-around to get higher frequency.

thank you for this information,

jeanna

@dasimpson,
an inductor is a coil of wire.
There is a lot of information available on this.
I recommend the MIT classes by Prof Lewin ... physics 802 class 16 or beyond. they are clear and very well presented.

[Pirate88179]

The Dr. Walter Lewin lectures are really fantastic.  I have learned a lot from watching them.

Here is a good example of an inductor used as a heater:

http://www.youtube.com/watch?v=d7DBS2Is0ws&playnext_from=TL&videos=_saRvLwIkoI&feature=grec

It melts aluminum in seconds!  of course, they are using a bit more input than 1.5 volts.

Bill

[dasimpson]

ty i will take a look at them i belive i found an inducter in the cfl light it has the markings 472k

[dasimpson]

wow erm yeah dont think ill go that powerfull but holy beeep

The Dr. Walter Lewin lectures are really fantastic.  I have learned a lot from watching them.

Here is a good example of an inductor used as a heater:

http://www.youtube.com/watch?v=d7DBS2Is0ws&playnext_from=TL&videos=_saRvLwIkoI&feature=grec

It melts aluminum in seconds!  of course, they are using a bit more input than 1.5 volts.

Bill