Joule Thief

[TheNOP]

If you look at the schematic included on the last composition, you will notice that the joule thief coil has A2 and B1 joined as the center tap to positive.

I did the same on the rightmost divided Joule thief coils.

If you see where the pick up coil J starts, it is the same as the primary coil A1, They start under the toroid.
If you see where the pick up coil K starts, it is the same as the primary coil B1, They start over the toroid.

The circuit and the real toroid must match and they are matched just like that.
If you want any changes, draw them on the composition and I will try to change them tomorrow.

sorry to annoy you with this again, i could'nt resist.
not that it give me problems.

it is just that i am trying to anticipate newcomers questions.
perfection come from small details...

your graphic make sense as a whole, yes.
but not when comparing to other "how to make jt" on the internet.

most state biffilar, wound in same direction.
if you were to slide one of the coil 180 degrees around, each coil will be a mirror of the other.
that is depicted in your pictures rightmost toroid.
but the connection does not go with schematics showing end to start connection of the coils.
that simple faq can be misleading when trying to make out the circuit from different sources.


the middle toroid, left side coil, is not a problem.
it is wound in reverse to get the start and end at the south possition
the winding is still in same direction and create a mirror of the right coil.

again, i feel that:
all coils be made the same is simple and, no or very little, questions can arise from that.

i would like to modify the pictures..., the faq is i don't know how and/or if i have the right software to do that.

[jeanna]

@All,
Well it sure is a good thing I am doing this for my own edification and not for your approval!  Your silence on this afternoon's report is deafening!

Here is another one. Now, don't go to sleep!

I kept the berry in the initial jt spot and used its secondary wires in the battery rail of the next jtc as earlier.
This time I used a toroid named XTree. XTree has 7T,7T,116T2^o

All the same components are in both  breadboards.
2N3904 one in each circuit
950 ohm at base of Berry's transistor
820 ohm at the base of the XTree's transistor


As before,

I checked the vitals of each one separately then when combined I took the combo vitals.

So, The only thing I really need to mention is that the XTree with its 116T2^o puts out a bit more juice than the widow. That is why I picked it for this next trial.

From the battery as a bjt:
XTree secondary produces 9 volts rectified, and through that same bridge a cap collects 25 volts

==
So, after I put the Berry's secondary into the battery rail of the XTree jt circuit, I measured 23.7mA being drawn out of the battery for the 2 ckts together. [the battery goes into the berry ckt and only the berry's secondary wires go into the XTree's ckt.]

With the XTree being fed juice from only the secondary off the Berry ckt, the XTree's bjt led goes on just nice and bright.
I tested a couple of things  and NOW, the rectified voltage off the XTree's secondary is 16.5 volts. The scope says 4.36 volts

I connected the XTree's secondary wires to the legs of- and lit - 3 leds in parallel.

They are not bright, but they are running off a second generation secondary being fed 4.36 volts.

And you aren't impressed enough to comment. man what a bunch.  

Finally, here is a blurry picture with labels that didn't turn out as well as I had hoped.
Including one insert from a different angle.
You can clearly see that there are 2 circuits here.
It is hard to see the secondary wires which is too bad. The berry secondary wires are in the battery rail feeding the Xtree ckt. And the XTree secondary wires are wrapped around the legs of one of those 3 lights.

I think this is really cool.

Wait til I put in something really powerful.

Actually, as always, I am trying to see what goes on. You may not remember, I want to make a hand wound circuit that has the same kind of kick up and power of the fuji circuit. And I am hoping to be able to start it with an earth battery. If not, a single AA or AAA.

here is the pic.

jeanna

The Berry is to the right and the XTree is on the left.

[Pirate88179]

Jeanna:

I, for one, am paying attention and I am sure I am not alone.  Don't let the "silence" fool you.  I watch, and if I have nothing constructive to add (which happens a lot) then I remain silent.  All of us know the hard work and rigid documentation you do on your experiments and we are all the better for it.  Don't ever think otherwise.  I have like 5 projects going on at one time so please do not take my silence for lack of respect for your efforts.  I am a better experimenter from having worked with you and I am sure others here feel the same.

Bill

[TheNOP]

I heard somewhere that you could put two like resistors in parallel and half the resistance of the one.

in parallel
R total = 1 / 1/R1 + 1/R2 + 1/R3 ... + 1/Rn

in series
R total = R1 + R2 + R3 ... + Rn

[MrMag]

Ditto to that Bill