Oscillator Powering 6 Modified Led bulbs

[SkyWatcher123]

Yes brothergrey, they are ferrite rings they use for noise suppression.
Not sure what kind of permeability they have, probably not much, though they are working well.
I'm at the moment, hooking up the line to the new set of 4 led bulbs.
peace love light

oh and the coil is wrapped around the ferrite tube, normal solenoid coil style.

[magnetman12003]

Hi magnetman, i had previously bought the ferrite tubes at a place called american science and surplus.
They are just over an inch in length, i just super glued 4 of them together to make the core.
peace love light

Here is a thought:  You can insert a ferrite rod into one end of your ferrite tube and by working it back and forth you can fine tune your circuit.  Glue it in place when you find the perfect sweet spot where best light output occurs with lowest current flow.   Also need to know -- I have a ceramic ferrite rod magnet that is 5 1/4 inch long and 3/4 inch in diameter.  Can a ceramic magnet be used in a ferrite called for situation or would the magnetic effect interfere in a joule thief application?

[SkyWatcher123]

Hi all, Hi magnetman, that's a good idea, if i had a ferrite rod that fit, i would try it for sure.
Maybe if you demagnetized the ceramic magnet, though somehow i think it still wouldn't work well, because it might want to become polarized again.
I finished the new setup, it is very bright, with all 8 bulbs burning.
Though it is using 7.6 watts, there is quite a lot of illumination being output for that wattage input.
Here is the circuit drawing and a pic, just to give an idea.
I also just realized the 4 newer led bulbs i got, they are showing around 55 volts on buffer capacitor, so that means those bulbs had a step down circuit inside them, where as the other bulbs show around 96 volts.
This would explain why they were not load balancing in parallel, with the single oscillator circuit.
peace love light

[magnetman12003]

Hi SkyWatcher 123,

I have two monster ferrite rings that are  5 inches in diameter and 2 inches thick. Looks like a huge donut Never found a use for them. Very heavy. Do you think one might make a good coil if I put the same amount of wire turns with 24 gauge wire you used on your 12 volt setup?
I can easily band saw slit the ring and wind turns through the slit.  The nice thing about this if it works at all is the fact that I can pull/push another small section of ferrite in and out of it and fine tune for maximum effect?

[Naija]

Hello Skywatcher,

Please can you show how you modify the bulbs without destroying it. The Cfls we have here can be easily unscrewed in order to access the circuit. But the leds bulbs here are completely sealed. Can you post a link on ebay where I can buy EXACTLY the led bulbs you are using? Can you also post a picture of the internal modified bulb, with the output connected directly to the bulb?

Also, can your circuit run directly from a battery with the same impressive performance as the computer power supply? Finally, speaking of your ferrite tube, does size matter?