Joule Thief

[Mk1]

@ Mk1

I do not know of any simple JT that will light a filament bulb directly from the pickup coil with only a bridge. But I am confused. A filament bulb should light with AC or DC so you should not need to rectify the pickup coil output to light the bulb.

Can you post a diagram of what your circuit is? If you are using a 1.5 volt AA for power it would seem that you are getting much higher efficiency than a regular JT.

You are right about not needing a bridge , it lights better without .

The circuit is a regular jt circuit it seems to work pretty much any thing for resistor , i tested from 2 k to 0 .

Its all in the coil... And yes AA .

Mark

I could not go to bed , its 7 am here  , i have so much fun.

This is to give an idea of the coil , Drawing are made by Broli i think.

[electricme]

Hello all,

Hmm nice drawings above MK1, I like the wires wound around the outside of the toroid, try them on the inside and the top and bottom sides as well.
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Just been fiddling around with an idea I have had for awhile now.
Last week I discussed this with Bill on Skype and he suggested I post it here on the Joule Thief topic.

Then trying to do this, I posted on the wrong forum as Jeanna so kindly pointed out to me, tankyou.

OK, I have been thinking how to make the "front" section of the toroid windings tunable, and I came up with this idea.
I have made this toroid and took photos along the way, it consists of circuits also.

One thing has been confusing me for quite a while and that is it seems we have moved away from the bifilar windings, I may be wrong, but I need to clear this up in my own mind, perhaps someone could let me know if this is the case.

Right, it seems we now wind several turns of copper wire on a toroid, then place several more turns further on, but right next to the first lot.

To make this adjustable primary you will need 2 of rotary switches, single pole multiple throws, or having 6 or 7 contacts in a circle, see photos.

You will need rainbow ribbon cable or several short lengths of insulated wire.

1 Toroid, who cares what type lol, just as long as you can wind it.
We need to make "taps" on every single turn that is on the primary windings, ha ha, its fun fun fun time as yogi bear says.

Here's the procedure.

Grab 6 feet of copper wire, anchor one end about 6" of fly end free, anchor it down with tape etc.
Feed the 1st turn over and down and back under the toroid, until it appears.
make the length of the protruding wire about 4" long, fold the wire back along itself and twist it tight until it is firm against the toroid outside side surface.
See the photos

Now its turn 2, do the same again, then fold the wire back on itself, twist the wire for firmness and do turn 3, turn 4, turn 5, turn 6 and turn 7.

Turn 7, make this a shorter loop, this is where the transistor Base connects to it.

Make turn 8, turn 9, turn 10, turn 11, turn 12, turn 13 and turn 14.

The end of turn 14 goes to the transistors Collector.
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Now heat up your soldering iron, to hot hot, so you can burn off the insulation and solder the copper wire, or just scrape off the insulation.
Tin all the loops along the outside of the toroid, about 1/2" away from the toroid.

Cut off the excess wire loops, but leave the 7th wire loop as it is.

Cut 2 x 6 inch lengths of ribbon cable or several 6" lengths of small insulated wire and solder them to each "tinned" wire loop.

Now grab a rotary switch, and solder each wire (1 to 6) coming off the toroid in turn to the correct position on the rotary switch.
Do the same with the 2nd lot of wires, but don't do no 7 loop. solder the 2nd rotary switch in a similar fashion to the first switch.

Grab a single wire, and solder it to the 7th loop, (cut off the loop), this flying wire end goes to the transistor base

The other fly ends, left and right ones, left goes to (+) and the other goes to the transistor Collector.
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That's it folks, now you can have a multy turn adjustable JT, you can adjust up and down at many positions to see which turns are suitable for different voltages etc etc.
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If you have 2 x  7 position switches, that gives you about 98 different possibilities.
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Another scenario is, and I haven't tried this but it will work, and that is creating loops at half turns, a loop on the outside of the toroid and a lop on the inside of the toroid, so you could refine the output by 100% even more. Say you needed a 1.5 turn, then you could achieve it this way, or perhaps a 2.5 turn etc etc.

jim

Now to see if this will post OK, its well after midnight, hopefully I have a little more speed on my internet sat setup.
Photos will follow if this is the case
   




     

[innovation_station]

mk1

if you put a compes near it does it rotate ...  and  your coil probally flys too fast to see rotation ... 

but your collector will read high freq...  cuz the laps ...  you have a freq convertor ..

1 tick makes many laps ..  i did it this way feroite and in reverse ...  1 lap and mutible collector laps ..

i still think dc is the way to go ...

only because it can be used easly with what is currently in use ... high freq   is not bad at all unrectified it does amazing things ...  but if your devices dont linke hv hf then problems arize ...

none the less high freq is a good way to not get hurt ..

did you try sheet alum inside it ?

alum will slow down the freq and increase amps ... if properly rectified!

got an old tuber?

ist!


yes 0 losses are encoured through resonant mass tuneing ... and if tuned right in you can have it run with gain alone ... 

if you use a higher volt cap ... nonpolar on the input /fly back ..  it compounds and releases ...

i found mechanical switches to be best to see this effect ..  b4 cap big flame in reed ... after cap ... tiny flame ... where did it go ... the cap .... : )

[electricme]

Sorry all,
I tried to upload a JPG and it wouldn't work.
In the morning activ8me sattlite is going to hear my tonsills rattling on the fone, stuff em, Im knobbled to 2 k speed.
grrrr

jim

[innovation_station]

jim

how ya been! 

remember those weird tube things .... 

i found in the old rf amps ... 

what are they agin ....  ? 

like a surge overload ... kick thing ?   

i see you come on i get the urge to digg em out!

why sir ?

: )

missed ya!

w

http://www.youtube.com/watch?v=HA9ffaWRsn8&feature=related

4 big jim! 

love you!