Stubblefield coils (bifilar) and speculations

[Pirate88179]

@ Jeanna:

I finally found it.  It was in the topic "AA battery to light led for long-long time."

Quote from Amigo's post:

"Here's my attempt at creating a miniature spark gap using two graphite pencil rods. I used a hair (thankfully I still have some left on my head Smiley ) as a spacer between the electrodes, and wrapped tinned 34 AWG wire around the other ends, then hot glued them to a small piece of plexiglass.

So now what do I do with it because from what Marco said we should either pulse the coil or use the spark gap but not both?"

Bill

[jeanna]

While I still think it is a good description of the possible circuitry within the Stubblefield battery,

"By connecting the #5 and #6 ends of the iron and copper wires through a Make and Break device, and directly connecting the #10 iron and copper ends, a closed curcuit is created through which the current can flow, creating the electromagnetic field, and allowing for the powering of a secondary coil, the electrical output of which can be tailored to need by its construction."

mthompson,

Darn! I thought you had his brochure.

I agree this looks like a good possibility for the connections etc.

What I keep my eye on is to be ??sure?? not to create a one way current. This device will not polarize according to Mr. Stubblefield. (That IS in the brochure - on the front page.) And I want to keep that. It makes it a permanent battery. Now to hook it up his way...

I am still waiting for R. Lochte (the author of the book) to locate the brochure and email it to me. I am expecting at least one gem. He didn't think NS used these to power his later inventions, and it looked to him that everything in the brochure was already in the patent. I hope there is more.

@Bill,

Thank you for finding amigo's pic. that is very clear, and very tiny.

I used a piece of paper to make a separator on the one I tried but I put it on tape. And the tape flexed. Who knows what was going on. In fact the tape is still there, but flexed, the terminals are too far apart.

The piece of acrylic looks stable. I wonder if it can be made adjustable. Will it be baby's hair or adult hair width. 

I will go look at that topic now,

Thank you,

jeanna

[storre]

I'm curious, why not just use a normally closed reed switch positioned over the iron bolt? The bolt will become magnetic which will open the circuit and then it will immediately close due to no magnetic field and the process stars over again. Seems the resonance of the coil will determine the speed and thus the secondary ac frequency.

[jeanna]

@Storre,

Thank you for this suggestion.

I don't know how to connect this. would you please help me with this?

I think I bought a few from a supply house, though I am not sure. They look like old time film with sprocket holes on the side. Left me scratching my head.

Thank you,

jeanna

[storre]

If it's not clear I can draw it but lets see if I can explain it. From the patent NS said that 2 of the wires from the primary, when you connect them, start the voltage in the primary. This I assume would then create an electromagnet in the bolt. So take those 2 wires that he says to connect (make and break) and put one on one lead of the reed switch and the other wire on the other end of the reed switch. The reed switch would have to be a normally closed type so that when it was connected it would immediately cause the magnetic field to start in the bolt which would then open the reed switch which would turn off the magnetic field and then the reed switch would close (it's normal state) and repeat the cycle over and over. The speed would probably be determined by the amount of windings on the primary which would effect the speed the magnetic field collapses.

The reed switch probably should be as close as possible to the bolt since I guess it's a week magnetic field. These reed switches are very sensitive so should be able to be activated with very little magnetic field.

If it's not clear enough I can draw it.