Joule Thief

[Mk1]

@gary

The 555 is a great idea , fix the freq first, but also the square wave will give you better output voltage, cleaner and more powerful emf.

@ist

Remember you don't need more voltage , but faster modulation , for greater emf current...

The speed is limited by the core desaturating speed , the cut core should be able to desaturate faster .

Remember the movie The Core ...

Also look at the my post on post on page 916 , the one with 2 jt on one toroid.
I get higher voltage with only one jt , plus the second jt can't be set the first jt triger it and causes interference . Those are thing to be aware of in designing a multiple jt unit...

@jeanna

Nice movies ... Keep the great work .

@slayer

Nice to see you again .

[jeanna]

...

I do not think that  a fancy  feedback system  is needed .
I plan on   using  a  lead acid battery .   



gary

Gary,
Isn't there a voltage regulator that comes as part of a car battery/generator system?

As I have said a zillion times, I am not a car guy,
but I had to buy one of those things twice and if it works in your circuit,
it might be an easy way around all this voltage regulation problem??

EDIT ADD

Also look at the my post on post on page 916 ,
the one with 2 jt on one toroid.
I get higher voltage with only one jt ,
plus the second jt can't be set the first jt triger it and causes interference .
Those are thing to be aware of in designing a multiple jt unit...

MK1,

thank you..

I am glad you are reminding people of this.
It is exactly what I found the day my 2 tier was born.

I am finding more ways to put inductors in there to enhance
the final amount of leds.
(I am finding inductors are helping more than caps,
which is surprising me.)

I was making the latest video when I changed the inductor
and that different size made all the difference.
It is an important thing to remember, so thanks
for bringing it up again.

@Slayer,
I too, am glad to see you again.

jeanna

[resonanceman]

@gary

The 555 is a great idea , fix the freq first, but also the square wave will give you better output voltage, cleaner and more powerful emf.

Mark

I am   thinking of   going  with  a TL494   it is  designed as a PWM.

It  should  be pretty stable ....... it has  a  built in  regulated 5V power supply  for  internal  functions .  including the oscillator .
It can  be  powered   with  7 to 42 V
Oscillator   frequency  from  1 hz to 200 KHz
Up  to 500 mA output   for  driving mosfets or  other   transistors . 

It may take me a while to get  up to speed with this .........but  it  looks to me like  it  will handle any  future  projects  I have in mind .
I am  thinking  when we get to multiple  battery systems  a separate  charger for each  battery  might be  best ....... the batterys  can then be used in series or parallel  as needed .


gary

[resonanceman]

Gary,
Isn't there a voltage regulator that comes as part of a car battery/generator system?

As I have said a zillion times, I am not a car guy,
but I had to buy one of those things twice and if it works in your circuit,
it might be an easy way around all this voltage regulation problem??

jeanna

The regulator in a car is  pretty much  just a  diode bridge .

With  my plan the majority of the problem is solved by  tuning the coil.
If  it  won't  go  over  13.5  V  on a diode  bridge ......it will not overcharge  a  lead acid battery .   As the  voltage of the battery  approaches 13.5 V  the   current  will  drop .
When  the  voltage of the battery  is the same as  the  voltage in the  bridge the only  current that will   pass is  the battery losses .


gary

[slayer007]

Thank You All.

I never left just been busy working.
But I still been reading up in this thread.

Great work everyone.

ITS asked me for a circuit here it is.

The capacitor I have grounded out on a metal shelf for an earth ground.
The battery negative is going to an earth ground a coper pipe about 2' in the ground.

If you use an earth ground for the cap. dont use the same earth ground.
Use a differant earth ground a little ways away from the other.