Joule Thief

[Mk1]

@all  ******this is important ******



Ok i will tell you about what a motor told me, a motor has 2 coil like the jt

I was using it like a generator to light led , so i connected the led directly on the motor lead , started rotating the motor shaft by hand , the led got bright right away , but i also notice the the shaft was not rotating easily now , not easy like when nothing is connected to it, then i use a coil on the negative led leg , the led got just as bright but the tension in the shaft was gone. I don't know what the coil did, how it could do so , maybe delaying the feedback , or changing its pole , choke effect ?

Ok now why did i tell you about this , well because if you load one of the pick coil with a big cap the the other pickup coil will show charge cap voltage, like in the motor experiment the jt get loaded back .

So now i suggest making a system that load back the toroid ,

first it will keep high voltage under load

second since the toroid dosen't get loaded back , the voltage voltage induced by the base coil will not change making it a better unit stabler one .

Now how to replicate the motor exeriment with a toroid .

Adding a coil , humm

Never loadding on one coil , both end of the load on diffrent coil never loading it back , humm





Mark

[jeanna]

@jeanna

Is your jt in attracting mode or repulsing ?

I am afraid I do not know how to answer your question.
If you take the red one and slide it up so in your pic it is to the left of the blue one and connect the 2 positive adjacent wires, you will have a fair picture of the primary.
The pickup is just a MK1 style but notice:
The MK1 windings are ending and beginning on the side opposite the primary ends. I have another one like this and it works well, so I knew it would be fine.

What I think is that the way you designed the pickup, it ADDS to the oscillation of the primary. I suppose this could cause the cancellation, but I don't think I have had that happen yet... or maybe I have. 

I believe the solution to yesterday's question has to do with the ratio of turns in the base and collector coils.

You have offered an explanation about pushing and pulling magnetic fields. I don't really follow how your pictures tell that story. If you could explain your concept again, maybe I could understand.

Sorry, You can do that. You won't get me to do that again, for sure!

I an not sure what it means ?

You can rely on my scope measurements now. I have it down.
I have a lot of problems taking pictures because of the glare. Sometimes I get a good picture before I move the frequency markers, but when I report the frequency it is accurate.
There are also times when the wave is too abnormal for the scope, and I will usually report or skip that one.
I had one yesterday. and mentioned it was a very unusual wave.

To be sure I won't blow my scope, sometimes I connect the ac volts on my meter. The difference is somewhere around  1/10 of what the scope will show. I can know I will be getting a big voltage if the ac volts says 10.3 volts. I am really careful when the ac volts on the dmm says 38volts.

... also not everyone got those ...

So i still don't get it.

In my experience , taking a 2n3479 and a 2n2222 , and tuning the pot i get better with the 2n2222 same jt setup. even better with 2n3055

Actually Mark,
What would be really helpful to many more than just me is if you would share those results more like the way I share my results.

Like what do you mean by better? what is better? does that mean the voltage is higher? Since you don't have a scope you don't actually know what the frequency is... how do you know it doesn't kill the frequency. Are there results you could tell us?
I think so.
You do not have to, but it would help a lot of people.

To be clear, I mean sharing your process will help more people be able to make a copy, than if you just say "I got better results with this."

thank you,

jeanna

edit:
I see you did a bit with the motor thing. good start.!! thank you.

[xee2]

@ Mk1

Now how to replicate the motor exeriment with a toroid .

Adding a coil , humm

My tests have shown that for best JT efficiency pickup coil load should look like large capacitor.

[Mk1]

I am afraid I do not know how to answer your question.
If you take the red one and slide it up so in your pic it is to the left of the blue one and connect the 2 positive adjacent wires, you will have a fair picture of the primary.

Maybe this picture will help now.

What I think is that the way you designed the pickup, it ADDS to the oscillation of the primary. I suppose this could cause the cancellation, but I don't think I have had that happen yet... or maybe I have. 

Yes i agree totally , when i connect them in series only one of the 4 ways get the voltage higher , honestly they are not really design for connecting them in series since the both pole are included , a one way pick up coil with a attracting mode jt one end of the pickup coil is negative and the other positive making is easier to match.

Actually Mark,
What would be really helpful to many more than just me is if you would share those results more like the way I share my results.

i Agree ! I don't have one i wish i did ! but i still have some good tools , my brain and heart got me at the right place at the right time .
It works for me , but a scope would help.

Like what do you mean by better? what is better? does that mean the voltage is higher?

Well i got a multimeter , and yes i get higher voltage like i commented like 500 pages ago. Plus in the 2n2222 data sheet it is clearly saying it is used for lighting fl tubes .

Since you don't have a scope you don't actually know what the frequency is... how do you know it doesn't kill the frequency. Are there results you could tell us?

Yes i do not have a scope , i have to use other things mainly my brain , even if my explanation of the problem could be explained other wise , the issue is there is a load problem , if there is a solution i don't care how its called or explained , but if anyone know the real terms for this then i will gladly listen .

Make a quick experiment but a bridge and cap on one pickup coil , then
the scope on the other coil , the scope will show you the cap voltage.

The idea would be to use one wire led lighting , but with 2 wire , like broken leads no loop on this stage.

I have had time to think about this for quite some time now , and most of the experiment i see these days look like what i have done i while back.

I also found this schematic , take a look at how they call the base coil , humm ... Its the regular base coil like the jt , this coil is really important the freq .

Now look at the arrows on the attracting mode then check the other one .

That means that the pickup coil can be feed the same pole on each side or the opposite one , if some one would like to rotate the field in the toroid , one mode is better then the other.

Mark

[Mk1]

@ Mk1

My tests have shown that for best JT efficiency pickup coil load should look like large capacitor.

I am not sure i get what you mean . Could you please tell us more .

Mark