Joule Thief

[ScienceMan]

@ TheNOP

Thank soooo much for those plans - I've got all the parts so I'm good to go. I'll build it this weekend and will post results!

SciMan

[Mk1]

@All

Most of my design need a real low resistor some times under 100 ohms , but may over heat the transistor , i have found a simple work around
No electronic here but coil design , now its running at the same speed with 850 ohms , i usually have 4 turns on each side so now 6 it dose remove some room for pickup coils.

Mark

Edit Core is iron powder toroid

[jadaro2600]

Is the toroid a conductor?  Does it conduct on the inside?

[TheNOP]

Is the toroid a conductor?  Does it conduct on the inside?

the ones in power supply give me about a few 100k resistance.
so yes, most toroids could be conducting.

[hazens1]

@hazens1

Nice presentation of your JT using only 8 mA, congradulations 

I noticed that you mentioned the JT coil was 22 turns x 2 bifilar Green 26 gauge magnet wire while the 4 turn Red 30 gauge Tertiary is exactly double the number of turns.

How was the Tertiary wound in relation to the JT primary?

It looks like it's all wound at the same time to me but please elaborate if you can, it looks different than the MK JT coils at 180 degrees which is ok as you seem to have a greater output with low power consumption than the original  JT circuit

Regards,
Paul

Sorry, I was mistaken. The Tertiary coil is 88 turns.

I wound the primary and trigger coils at the same time using a double strand CCW around the core 22 times for 2 coils of 22 turns filling the inside exactly 1 layer 360° outside layer was ~50% filled. Then I came back and wound the tertiary 1 time between each wind of the primary and trigger going around core twice (second time around was CCW or to the right of the first) giving 88 turns CCW 720°. I can try to take some closer pics..