Joule Thief

[resonanceman]

    @ All:
     What if any is the advantage of using a capacitor instead of batteries. Yes, they work, but, do they last longer, work better, cost less etz...? 
  And has anybody found a way to charge the Run battery, dirrectly yet,  without having to swap and use a second charge battery? Or use a switch. Just using the One Battery to run and charge itself. I think that it has been done, possibly by Lidmotor, (or someone else).
   I just built a coil for my JT using a 2 inch circular ceramic magnet (thin round magnet) similar to the speaker magnets but thinner. I could not notice any beneficial effect of power over a smaller 1" ferrite toroid. It did have a metal shield on one side. I didn't try it by taking the shield off. since iron can help induction by 5000 times. I don't see any advantage yet.
   How many volts does a JT primary need to output, to produce the higher volts (like 1000v, or 10.000v) when a secondary is attached.  I see little or no induction output in a secondary using the 2n2222 transistor.
  Also, how is it possible that a BJT producing only 4 or 5 volts can light up Many 3 v Leds, in my case 25 Leds, possibly many more.  25 Leds times 3 volts is 75 volts worth, from 4 volts using two AAs.   Even if it can light 100 Leds, would they produce more actual light,  than when using only 25 Leds?
    What can a JT do running the new higher powered 12 volt Leds lights bulbs, that have 60 or 100 Leds inside, has anybody tried them yet?
                                   NZ
                                                           

NZ

Maybe the biggest  advantage of using  a capacitor rather than a battery is  if you get  it  to self charge  with a cap  there is little  to argue about.......a battery is based on a chemical reaction and that makes it hard to tell how much power is actually there.\
On the other hand that chemical reaction also helps regulate the voltage making  a JT with a battery more stable than a JT that runs off a cap.
A cap will probably also need  over charge protection  of some kind.



I have had some luck in the past with feeding  back energy to the same  battery........but  the process took a bunch of coils........usually around 9
I was  able to  get both the battery voltage and the  voltage across the C and E of the transistor  to rise  at he same time
I could keep  it self  charging  as long as I wanted to.........but not automatically .....I had to tweak  the pot every few hours to keep it charging.
I am currently  working on a simpler version that  will work automaticly  and  have  just a few  coils



How many volts from a JT  it takes to light a LED has no real answer.
It depends on the JT .......Is it very spikey or is the output more like a sine wave.?
I have lit  up  the same  90 LED array  brightly  with 250 V showing  across its  leads..........and  with as little as 2 V,......
I like  using my candy cane  coils.........they tend  to be very  spikey......The  way I tell is that they will light up  the LEDs  with much lower  voltage indicated on my DMM.

gary

[NickZ]

   Resonanceman and All:
   It looks like certain types of capacitors accept pulses better that others do, and can possibly charge back up more efficiently than batteries do.   It also may be possible to use them as start caps, and the device will output directly when turned on, without even having storage batteries.  Start caps would recharge themselves at the same time. Adding magnets might help, although I don't see any effect by placing magnets on the coils at the basic jt level.
  Do we really need the higher powered JT, or can they be made to work great at very low voltage.   I like the way they can light a 90 light leds panel with 2v.  But it's not how low a voltage they'll work at, but How much Light and output they can be made to produce.  It may be possible to have them selfrun, with 0 volt external input. 
                                   NZ
 

[crowclaw]

 
  Do we really need the higher powered JT, or can they be made to work great at very low voltage.   I like the way they can light a 90 light leds panel with 2v.  But it's not how low a voltage they'll work at, but How much Light and output they can be made to produce.  It may be possible to have them selfrun, with 0 volt external input. 
                                   NZ

If you want to light 90 led's then you will connect them all in series! so as each led requires 2 volts each then 90 x 2 = 180v OK. The same current required to light one led is thus shared by all. So 20 milliamps to light one becomes 20 Ma for all (in series) If all are wired in parallel the common voltage needed for all 90 is infact only 2 volts. However each led now needs 20 Ma each = 1800Ma or 1.8 AMPS This is the difference in how you use Led combinations. A JT circuit running from a low voltage source can produce high voltages but only at a low comparitive current, for most of your basic circuits. Regards Merv

[Pirate88179]

Jeanna

Here is a link that caught my attention  a few days ago.......not exactly sure how I found it.....I  thought I was going to this thread and ended up there.


http://www.overunity.com/index.php?topic=8825.0

The device looks  very simple....... and it looks like a few  companies may be investing in the idea.

I  have only got to page 10 so far..

I see no  sign so far that that anyone there has expermented  with impulses.
First tests  ( on the link above ) indicated that the circuit  seems to have some sensitivity  to polarity..... connecting the  polarity one way  gave 1V connecting it the other way gave 1.5 V
My hope is that  this  effect can be used  for rectification  eventually.

I have built a couple small test coils  to see what happens.

I have made 2 coils that are pretty much identical
Same number of toroids .......same number of windings .

I have placed  one  coil on top of the other  and put  very small NEOs  in between  each set of toroids.
The magnets are small.  1/8th  in diameter and  1.16 in thickness
If I do not  get  impulses through the circuit  I can start taking magnets out ........one by one.............or add larger magnets as needed.  This system should  be almost infinitely tunable.

I am  thinking  that the magnets should  be strong enough to block  the sign wave part of the signal.........but weak enough to pass most of the impulses.
I am hoping that the magnets  have a sharpening  effect on the iompulses rather than a dampening  effect..........This is just a hope ........I have not started testing yet.



I will  be powering this  circuit  with a JT  that is  strong enough to light  a CFL.
I will start  with it in series with a load.........but hope to make it the load eventually.

gary

Edit
In the top picture the shiny things between the  toroids are the magnets......... those magnets are all that is holding the 2 coils together.

Gary:

That link is to a topic started by Lawrence Tseung of the famed Lead Out theory.  I suggest that you read all of the posts.  In my opinion, his theory is flawed, very flawed.  He is now using a simple JT circuit and claiming over 35 COP.  He is not accounting for the energy input, only the output.

He has, in the past, both here and on other forums, asked for money for non-proven, non-existent devices.  His current device is based upon Gadgetmall's JT work.

He is probably a nice old guy that is a little mixed up.  But, I would not recommend that topic before looking into his other topics and reading his assertions and ideas.

I do believe that he means well but...well, just see for yourself.  Check out his other topic where he promised a working UFO to be demonstrated at the China Olympics.  The hyper drive was to be based upon his theory.  Of course, this did not happen.

Bill

[Pirate88179]

Jeanna:

Cool bulbs!  My Walmart just now got in the basic LOA bulbs you were using a while back.  I bought 3 of them in different sizes.  They had nothing like the ones you posted.  If/when they come in I will get some to play with.  I think I have a few ideas I want to explore.

Bill