Stubblefield coils (bifilar) and speculations

[jeanna]

Gary,
This is a very interesting proposal.
I need to study it before I make a real comment.
I wonder what kind of cap you are talking about?

-----------------------------
The following is for you and Bill and anyone else making these things on a budget. 

I make a coil for under $10. maybe a lot under.

A 1/4 inch bolt is 40 or 60 cents.
The 24 gauge wire is 4/roll of 100 ft.
the 24 gauge zinc galvanized steel wire is 4/roll 250 ft.
The cotton cloth was from flour sack cloths. which I bought 5 of but only needed 1 for something else, so they were not free but free. thread and needle even if you need to buy these are no more than 2$ for 10 years supply.
Washers are 20 cents but need to be taped. I made some washers out of yogurt tub tops. Poke a hole and feed the wire through. It works better than steel ones.

Now the cap is more and so is the secondary wire unless you take apart a broken something as Bill did.  But you can make these little coils for trying out ideas for cheap. The real big ones we will need later might cost something, but not these.

Also, I found that the 1/4 inch bolt is the perfect size to slide into a plastic drinking straw. It is a good insulation and very thin.  (Drinking straws vary a little, but the striped ones in my supermkt were 1/4 inch.) This means you can re-use the bolt because you can slip it out later.

Just remember these are small and the voltage will be small. and don't be discouraged.

jeanna

[Pirate88179]

@ Jeanna:

Great post!  You are correct in your advice.  Anyone can make a small, simple, cheap version of the NS coil.  The only thing I am wondering about is the plastic straw....what are you using that for?  If it is for the insulation between the wire (first layer) and the core, I thought we needed that to be cotton as well to allow the passage of moisture and, whatever else.  I think maybe Hans said something about using heat shrink tubing for the same purpose so maybe my information is incorrect.  If you are getting near the output of what I am getting, and you are using the straw, then I guess that settles it. (I didn't remember if you used this on your 19 mA coil or not)

@ Gary:

Supercaps can't handle much voltage?  Do you mean total or for storage?  I thought that 5.5 F was a very large amount.  Of course, this is volume and if you put 2,000 volts to it it would blow up.  I am just not sure what you mean.  I love supercaps. (can you tell?)  They are so new that I am betting they have not been fully explored as of yet. Maybe we can go to a supercap and then to a rechargeable bat. to collect the energy there?

Bill

[jeanna]

the plastic straw....what are you using that for?  If it is for the insulation between the wire (first layer) and the core, I thought we needed that to be cotton as well to allow the passage of moisture and, whatever else. 

You are correct, Bill,
It was the thing that almost made me modify the post. But I am not sure.

First, no, it is not on the 19mamp coil. That coil uses a piece of pipe from the plumbing department. It was $4 so it adds that amount. not much for a whole lot of juice. But it is 3/4 in thick inside diameter so it takes a lot more wire. I got 6 full layers out of 100 ft. That is probably Ok cuz it is so strong. But I cannot experiment with longer lengths of wire. just shorter.

I guess this insulation is truely one of the questions. NS didn't have plastic. and he did say insulator, and when it needed more than cloth he said mica or similar. We can assume, but we don't know what it was for.

So, yeah I don't know about the straw. (when I used the straw, it was on the non-galvanic ones and I used the straw to be sure no galvanism occurred.)


Here is the thing about that core bolt. Maybe it needs to be galvanically connected to the rest of it but there is a need for capacitance in the workings of this thing. an insulator is what he specifies, and proposes a cloth or similar material. This is just another thing we must sort out.

And perhaps it is better not to make it from a straw just now.

thanks for asking.

jeanna

[resonanceman]

Gary,
This is a very interesting proposal.
I need to study it before I make a real comment.
I wonder what kind of cap you are talking about?

-----------------------------
The following is for you and Bill and anyone else making these things on a budget. 

I make a coil for under $10. maybe a lot under.

A 1/4 inch bolt is 40 or 60 cents.
The 24 gauge wire is 4/roll of 100 ft.
the 24 gauge zinc galvanized steel wire is 4/roll 250 ft.
The cotton cloth was from flour sack cloths. which I bought 5 of but only needed 1 for something else, so they were not free but free. thread and needle even if you need to buy these are no more than 2$ for 10 years supply.
Washers are 20 cents but need to be taped. I made some washers out of yogurt tub tops. Poke a hole and feed the wire through. It works better than steel ones.

Now the cap is more and so is the secondary wire unless you take apart a broken something as Bill did.  But you can make these little coils for trying out ideas for cheap. The real big ones we will need later might cost something, but not these.

Also, I found that the 1/4 inch bolt is the perfect size to slide into a plastic drinking straw. It is a good insulation and very thin.  (Drinking straws vary a little, but the striped ones in my supermkt were 1/4 inch.) This means you can re-use the bolt because you can slip it out later.

Just remember these are small and the voltage will be small. and don't be discouraged.

jeanna

Jeanna

The  cap I would  start  with is a motor run cap ....... 5 F  270 V AC ...... I also  have some smaller caps   that I would try   just  to see  if  the size of the cap makes  a difference .

I will think about  building  smaller  coils ........in  general  I  follow what I see in my mind on such things .
The  coils  I  see in my mind have big  wire .......around  1/4 in .   

just before  I went out to buy  parts  for my  coil I  wrote   that  we should  keep the coils  small .......because it is hard to make  a   big mistake  with a small coil .   
When I got to the store I found I  felt compelled to buy  what fit what  I saw in my mind ........not what I intellectually  thought  I should get.

For me  seeing  how  things  work is not an intellectual process .
I  try to  understand it  the best I can .......then  ....... I will  often  see it .
I can't  get things like math  formulas this way .....but I can often get  a good  idea the relationships  involved .   




Bill

I  don't  have  any real  experience with supercaps ....... I did  look  for  them online .....what I found were  caps that   had a very  high  farad rating but low voltage .... starting around  3  V  and topping out around  100 V

The ones I looked at were also very  expensive .

If  this   idea  of  using  earth batterys in place  of   the horseshoe  magnets  work well ...... (the horseshoe version  put out 8 volts )    there could posably  be  much higher voltage  from    our coils .......I just  didn't want  anyone  blowing  up  supercaps testing this 

gary

[Pirate88179]

@ Gary:

Awwww come on, you mean we can't blow up some caps?  Where's the fun in that? (Ha ha)  Like I said, I am still learning here so it is quite possible that I may blow something up before it's over.  There are many things I still don't understand about capacitors, or super caps.  Like, for example, your 5 F 270 volt cap........if I were to hook up 3 volts to it and let it sit there and charge, would the max. voltage on the cap be just 3 volts?  Or, would it be able to continue to charge to the full 270 volt capacity?  In other words, can you fill a cap. or super cap up with more volts than you are putting in?  Like a small hose of water filling a large bucket...the bucket will fill eventually...is this the same with caps?  I can't find anything about these questions in any of my electronics books, or on the net.  So much to learn.

Bill