Joule Thief 101

[resonanceman]

What happened?
but first start another thread so this stays 101

what happened?

jeanna

Jeanna

Nothing happened

I did not  have time to add as much as I wanted......and others  choose to add very little.

What I am posting now is  a little more advanced......but it still needs to be where people can get to it without having to go through 1000 pages


gary

[resonanceman]

I put the  2  4 and 6   toroid coils in series

They produce  33 V loaded .......the array  is near full brightness

59 V unloaded


gary





Edit

I switched  the wires around so that the LED array is being powered by 6 toroids and the other 6 are connected to my Jesus charger ....... for feedback

I am getting 33 V with the array lit at least as bright  as before.


The picture is  of all the toroids in series
A picture of  the  toroids wired half  for feeback  would look the same  except each  set of 6 would be wired seperate one poweing the LEDs and the other  feedback

Note

I chose to  wire the  toroids in 2 groups mostly to show that it could be done .........as  long as the  primary ( blue and white wires ) go through the centers  of the  toroids  they are part of the circuit

[jeanna]

Hi to all people who are having a hard time finding good toroids.

I want to offer a ray of hope.

I just made a really great jtc today and with it I will be able to light up a small room with many leds in both series and parallel.

So, first the toroid came from the circuit board that was part of a 13w cfl.
(I think 13 watt. It could be 10w or 20w,) but you can see in the picture that the toroid was next to the can type capacitor which is bent over.
You can see the space where it was.

Now, look closely and you will see a gold wire which is the base coil. 9T
And, a green wire which is the collector coil, 12T
I then wound the red in the space that was left and it was 10T.
The transistor is a 2N2222. I am sure you can substitute with a 2N3904 or even the transistor from the same board, will probably work just fine.
The resistor is 470 ohm. It is one that I got for free from the purchase of some leds from china. For some reason if you use these leds in a car with 12v they have it figured out that you need 470 ohm resistors, so I have a couple hundred of these.

As you can see from the scope shot, I am getting 54v-62v
at 62KHz.

If I were to make a jtc with a Light from the secondary using this toroid as it is, I would solder 7- 8 leds in series and 4-10 in parallel. This will give you one light that is as bright as a 28-80 watt light bulb which will run off one AA or AAA for a very long time.

Remember this is being connected to the secondary.
That fact means that the number of leds you use will make NO DIFFERENCE WHATEVER to the length of time this will run on one battery.

Do you see how the red secondary wires are stuck into the breadboard?
They are on the ends of the 8 leds which are arranged in series.
BTW, if I put the wires in the opposite ends the lights do not go on at all, so always try both ways.
I realize most people do not have a scope, so, I believe you can follow this as a recipe with some assurance.

I hope this helps,

jeanna

[kooler]

thanks jeanna
i like to see stuff recycled.. i was worried about those toroids in the cfl due to there yellow color which i thought was a powder iron core..
you know it was a electronic ballast that made me build my circuit that i video..
then i saw it was also a stun gun and strobe circuit so i have learn alot since march 09

[jeanna]

I had a thought this morning as I awoke.
I remember jesus nievesoliveras had only 2 leds which he had rescued from some things at the dump. One day he was devastated because he had popped one of them with too high a voltage spike. I certainly do not want my recipe to pop anyone's precious leds, since this may be the case for many that leds are hard to get, or that purchasing through ebay from china with paypal or credit card is impossible, so I have an alternative to the recipe that uses only one led.

Everything is exactly the same, except that I wound the secondary through the core only one and a half times such that the wire goes through the center 2 times. Here are the pics of the breadboard with one led lit and the scope shot.

jeanna