Joule Thief

[jeanna]

Is your secondary  coil split into two separate coils? When you give secondary voltages each way, is that the voltages for the two parts of the secondary coil?

No, It was something MK1 said he did when I was getting to understand his special coil design back a ways. It took me a while to even understand what he was doing with the rectifier. He and I am just measuring what voltage is available coming off those secondary wires.

It sometimes is rather different in the different directions. They seem the same on this one. So, this is one coil 120 turns measured as though it had polarity.

thanks for that explanation,

jeanna

[jeanna]

@jeanna

Remember i got 4 coils 2 pickup coil, i don't even look at the coil voltage both ways , there usually about the same once rectified,

On this picture you see output from pickup coil 1 in red for 67 volts, and 2 in blue for the second 67 volts , all the test are done with the same design of 4 coils

Oh I see. I never did those tests right, then. I didn't have 2 separate secondaries when I made the MK1. I only crossed over the other primary and continued on.

I went up 13 then down 13 and across, then up 13 again and down 13 again. this gave me only 2 ends with 52 turns.

I guess that is also where I got the idea to turn the wires around and check the other way.

All of my results were based on this. This goes for the thickness of wire tests too!

So, my "MK1" must be considered a variation of the one you made, not a replication.


oh well.

jeanna

[Pirate88179]

@jeanna

Remember i got 4 coils 2 pickup coil, i don't even look at the coil voltage both ways , there usually about the same once rectified,

On this picture you see output from pickup coil 1 in red for 67 volts, and 2 in blue for the second 67 volts , all the test are done with the same design of 4 coils , i did it on many different core, and the output is really adjusted by the resistor that goes to the transistor base, on this core 1k is a ok , but not for the other ones. Each different toroid of ferrite or powdered iron will work but at there own speed (adjusted by the resistor) and induction, some need more coil turn some less (on the jt side)for getting enough induction for a good pickup coil output.


This core dark green works at 1k when used with a 2n3904
The yellow with white edge needs 5 ohm with a 2n3904
The green with a blue edge needs a 55 ohm with a 2n3904
The green with a red edge is under testing
All those are the same size toroid

@all

By the way , to me iron rust is iron even if baked in ceramic over , ferrite is mostly iron and powder iron  or not it will work when done right , in french "fer" means iron.

Mark

I got pc issue damn the trojan! I getting harder and harder to be with you friends.

Great picture of your coil.  I understand it much better now.

Ferrite is NOT mostly iron, it has no iron at all.  It is not powdered iron either.  It is Fe2O3, iron oxide.  Yes, it is basically rust that has been highly compressed and fired at a very high temperature.  This is actually how iron occurs in nature as an oxide.  The same with aluminum, you don't find aluminum in nature, you find Al2O3, aluminum oxide which is the white powder you see when your aluminum lawn furniture "rusts."  Aluminum and aluminum oxide are 2 totally different items as are iron and iron oxide.

From wikipedia: "Ferrites are usually non-conductive ferrimagnetic ceramic compounds derived from iron oxides such as hematite (Fe2O3) or magnetite (Fe3O4) as well as oxides of other metals. Ferrites are, like most other ceramics, hard and brittle."

Now, you say you don't see any difference in the JT circuit application between powdered iron and ferrite, and that is good.  I didn't know about that.  I was concerned there would be a difference and you proved there is not.  Now, if we were making wave guides, I know there is a big difference.  Just thought I would pass this on as I spent over 20 years in the precision ceramic machining and ceramic design engineering Industries.

I don't see how you get your toroids wrapped so tight and neat.  I pull my wire very hard while wrapping and it still seems to go where it wants to go.  The bead I wound a few days ago, I even tried a tie-wrap and it helped, but mine don't look like yours.  nice work.

Bill

[jeanna]

This core dark green works at 1k when used with a 2n3904
The yellow with white edge needs 5 ohm with a 2n3904
The green with a blue edge needs a 55 ohm with a 2n3904
The green with a red edge is under testing
All those are the same size toroid

I am sorry to hear about the trojan,

Thank you, btw, for doing this comparison study. It really helps.

I have a question for you.

Is there a way to put these 2 separate winds together? When I tried to do that it lost a lot of power. I assumed I had taken it into an area not suited for use as a secondary. But, since you are making these as separate winds, I assume you can use them in an additive way?

Or, do you use each one on a separate circuit?

thank you,

jeanna

[Mk1]

@pirate

Its pretty easy with mag wire 26 turn on each side 13 up 13 down you just put them in the space left between the wires there all ready , at first the a bit slack but going back down fixes that. You got to make those jt coils first then 13 on each side then come back down then all will be tight. Some toroid really need more inductance from the wire then the jt coil need to be adjusted , after that connect you pickup coil to rectifier in my case 2 rectifier , and adjust the base resistor to get the best output , then you will be in the freq range for the core , other transistor will be adjusted , if you try different transistor the resistor value needs to also be adjusted.

@gadgetmall

For the last mag amp , it just basically said that the coil on a toroid has 2 states of function 1 with the core unsaturated and one when core fully saturated , it goes from high to low inductance and impedance drops to zero (impedance , resistance of circuit drops to zero)

@jeanna

To get the neon i need the in series to get enough voltage, i am working on a positive feed back system to put the positive part from one coil in the other coil and keeping the negative out that way the still in series , when you connect them in series if you don't connect them the right way and the coil have the same number of turn you will get nothing out of the coils.