Joule Thief

[altrez]

@jonnydavro

That is a great idea! I will try that today and then post the results from 3 different toroids. Thank you for the help!

@TheNop

The Leds I am using to test with are RadioShack part #276-0005 Ultra High Brightness 10mm White LED with a FW supply of 3.5V and a max of 4.0V. They will not light from the battery at all by there self. If I add in the JT circuit they will light just fine. And yes I have th 3rd coil setup for induction work only. Thank you!

@jeanna

I have around 6 DMM to test with I do have a local radioshack here in Kentucky where I buy all of my LED's from. Thankfully god has blessed me with a understanding wife and money is not an issue with small projects such as this one. So thankfully I can buy things as I need them with in reason. I have around 40 LEDS ranging from 3.5v to 1.7 volt And I have tested the JT with all different types of LEDS. All of my JT circuits work. No pickup coils work however. Even with a 1.7volt LED on the pickup. Thank you for helping me try to figure this out!!!

@ALL

Thanks!! This is really an awesome place to hangout and tons of nice people!!!

[resonanceman]

I've posed this question once before; I will simply rephrase it now due to the fact that it's been a broken thought across many posts.

Shouldn't we worry about what type of voltage is bouncing back to the negative end of the battery?  Couldn't this effect the battery?

Jadaro

If  we  made a JT powerful enough   the voltage  bouncing back to a battery could become a problem .
As it is now .......I think that most people are working on  getting  the most that they can from the secondary .   It is  somewhat isolated from the  rest of the circuit .  so  risk to the battery or transistor  is minimal .

I still wonder if the fact that this is a toroid has something do do with it's effects - which is why I asked about the ferrite rod, and posted that picture of the split lock-washer.  I'm thinking about sacrificing one of my toroids to create a split in it just to see if this effects operation as I think it may - what gets me started in on the weirdness of all of this is, that the majority of electromagnetic fields ( flux lines and thus current ) are at the center of any coil and so out toroids must be conducting, if at least a little, on their inner material, as well as at their center of gravity.

Conducting  electricity and   conducting magnetic flux are 2 compleatly different things .
A magnetic  conductor  does NOT need to be an electrical conductor .


The thing about toroids is they  keep the  flux path  within them .....  at least that is  my understanding.
The  fact that  there is a complete flux path  helps create  a little  " magic " at times .

To get the same  type  of  affect  from  a  rod you would have to add  a return path  for the flux  ........transformers do this  with the  laminated  iron  that  goes around the  coil .


gary

[hazens1]

Here are 2 pictures with 4 classic JT circuits running. All 4 are using 10k resistors and NPN 2222 transistors. Each pair is sharing a single rechargeable 2100 mah 1.2 volt battery. LEDs are 10mm White 100ma ultra high brights. All LEDs have brightness approx equal to running off 3.6v, 80ma power supply from RC car recharger. There is a 1 amp chip style bridge rectifier on each board not being used..

4 different coil arrangements....

1. 1 inch ferrite toroid sold at Elec Goldmine in 5 pack for $1
2. 1 inch ferrite High Permeability ferrite toroid sold at Elec Goldmine for $1 each
3. 1 inch Yellow ferrite mystery toroid ripped out of a comp power supply (had to add a small cap parallel to resistor to get to light)
4. 3/4 inch diameter, 2 inch long ferrite transformer core taken out of a microwave oven

All have 10 turn bifilar made up of 22ga speaker wire from Radio Shack

1. Power consumption is 20ma
2. Power consumption is 22ma
3. Power consumption is 18ma
4. Power consumption is 25ma

Reguardless of core meterial, all these cores are pretty much doing the same thing with 10 turns. Not sure why number 3 needs a cap to light, might have something to do with the cores inherrent frequency. Adding the cap parallel to the resistor changes the frequency of the circuit.

Enjoy! Questions? Answers

TYGER

.

[innovation_station]

sure i have a question ...

cap voltage...

also

why did you not split the jt on the flyback

and wind collector coils.....   WHERE YOU PUT THE JT...?? ??  somthing fly out the conners?!?!?!

IST?




how you gonna ramp it up ?? lol

[jeanna]

Hazens1

very good job.
Thank you so much for doing systematic work on these toroids. It has real meaning.

thank you,

jeanna