Joule Thief

[nievesoliveras]

Never mind

I found  my answer after  3 days of looking

It  turns  out that  most of the information  on  building   PWMs    is either  buried in  hundreds of pages of  posts  or  in videos .

My connection  is  to slow for  videos .... So  I guess  I am  pretty much locked out of the loop

Same  thing  with this  thread .
All the new findings have been  going into  videos .
That might  be  great for some .......but for me it sucks


Can  anyone here  believe that no one that has  visited this thread   has any experience    buildinig  a PWM ?
Yet   my question  went unanswered .



I guess I am just  tired of wasting my time here 
The  time  I spend waiting for   posts or getting timed out  could be spent  much more constructively

I may  be  back   If I  get something   new going .
For now  I am out of here .



gary

@resonanceman

Dont quit.
The 555 circuit is the first one I learned from the radio shack electronics course I bought.

I used it on a pulse motor and it worked very good.
If it help you somehow it is the following shematic.
Make any question about it.

Jesus

[Mk1]

@gary

http://www.eleinmec.com/article.asp?28

http://homepages.which.net/~paul.hills/Circuits/PwmGenerators/PwmGenerators.html

http://uvasux.googlepages.com/pwmmodulator

http://www.dprg.org/tutorials/2005-11a/index.html

http://www.josepino.com/?pwm

I also have seen some dirt bike ignition coil with 4 leads ...

[jeanna]

Gary,
I made a couple of videos for you and protonmom.
I never heard from you so I figured the videos were working ok.
I found out right away from protonmom that she could not see them so I went into more verbal length.
I am sorry because I never wanted to cut either of you out of my loop.

BTW, I think the joule thief is a kind of pwm, so I don't see why someone would use a chip instead of a toroid. The chip is vulnerable in a way the toroid is not. That is up to you... just my opinion.

Please stay.

jeanna

[resonanceman]

@resonanceman

Dont quit.
The 555 circuit is the first one I learned from the radio shack electronics course I bought.

I used it on a pulse motor and it worked very good.
If it help you somehow it is the following shematic.
Make any question about it.

Jesus

Jesus

Thanks for the  schematic

That   schematic would have  saved me  3  days
All  I really need to know   is  if  4 and 8  were  both connected to   B+
On the  schematic  I had one of those connections  was  in green for some reason . 
It was the only  green  wire ......all the others were back


Mark

Thanks for the links
I  have not  had the time to look at them  yet .........but  I will soon

A ignition coil  with 4 wires ?   I would  bet that would  be very easy to make into  a  high  voltage JT

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`

My  deciding to leave is mostly  a time thing .
My connection is slow enough that   a page  on this site often  times out ......sometimes  4 or 5 times .
Quite often it  loads  about 90 %   before it times out .
When it mostly  loads  a few times  before timing out ......it may take  15 minutes   just  to  get to the first posts .

The  clincher  is  that I  realised    in the   days I was looking for the   555  info  that now so much of the new info is   in videos ......and  so not available  to me .
I  did  try  downloading   some  videos  in the last few  days .
I  the best I did  was  about 3 min ....... then it  stops ......but does not seem to know that it has stopped .

Just watching videos  it buffers  a few minutes then  plays  a word or 2.

I just can't  go on   wasting so much of my free time  trying to  keep up on the posts here

gary 

[resonanceman]

Gary,
I made a couple of videos for you and protonmom.
I never heard from you so I figured the videos were working ok.
I found out right away from protonmom that she could not see them so I went into more verbal length.
I am sorry because I never wanted to cut either of you out of my loop.

BTW, I think the joule thief is a kind of pwm, so I don't see why someone would use a chip instead of a toroid. The chip is vulnerable in a way the toroid is not. That is up to you... just my opinion.

Please stay.

jeanna

Jeanna

I am hoping  that the   timer is  more stable than the JT 

I can get  a  JT to self charge  with enough  inductors  .
The problem is   I can't get it to keep  charging .
I  am pretty sure  it is a resonance thing .
It  charges well  when  it is in resonance  .........but  as the battery  voltage changes  ....it drifts out of  resonance and  stops charging .

I  am hoping that   with  a chip I can  set  the frequency  and it will  stay  at least close to that  frequency  over a wide voltage range .
If so  .......It should  be much easier to keep it in self change mode .

gary