Hello pardon,

I've see this schemantic of a youle thief device on youtube.
I rebuild it with a BC 337 Transistor and a handmade coil (primary 12 turns, secondary 30 turns)
It starts to pulse at 0,8V from an old Mignon battery.

I build it without the ignition coil and get more then 12 V DC

Peter

@padda,
Welcome to the forum peter.

Quote from: pedda on March 28, 2010, 08:44:20 AM
hello @all.

i've read this thread for a while and build an earthbattery with
2 simple CU-Pipes with a diameter of 22mm and a lenght of 1.50m and some zinc Pipes (diameter 25mm and a lenght of 0,5 m)
I get 0,92 V at 0,040 A.
The Amps go fast down  to 0,005 A if I test ist with my meter.
It looks for me like a capacitator.

How much Amps did you get from your earth battery? And what is your setup?

Peter

No it's not a capacitor, it gives the impression of one because of its extreamly low output, so any "load" on the output makes it drop so quickly.

Nice to know you have read through the forum, well done.

You won't get too much volts or curent out of just 2 pipes, if you want to increase voltage and current you will need to make many many copper pipes, then connect them in series for voltage.

Place your copper pipe towards North, and the zink pipe to South.



If you want voltage and current, then you could connect several into series and parallel.

You will need to insulate the outside of each copper pipe, and also seal up the bottom of the pipe. I used electrical insulating tape for this.
The highest voltage I got was 66volts open circuit voltage, using 83 copper pipes about 7 inches long, filled them with dirt, then put a zinc coated 4 inch nail as the center electrode. These were all connected in series.

I have had it arranged in a series parallel connection ever since that first week.

I was checking it just yesterday, it is still working after a year, but is much reduced in voltage. I pulled out the zinc nails in 7 cells, they are now corroded and rusty, so there is a galvanic reaction with them, not to worry, it lit a white LED for a year non stop, so I'm not complaining.

So Peter, if you want to make Stubblefield coils, then stick around here with us all here.

jim



   

Hello Jim

Quote from: electricme on March 28, 2010, 09:16:10 AM
@padda,
Welcome to the forum peter.

I've read the forum  for over 3 years.....

Quote
If you want voltage and current, then you could connect several into series and parallel.

hmm. Connect in series don't work for me. Parallel works and the amperage goes up.
Is there a hint to do it  serial

Quote
You will need to insulate the outside of each copper pipe, and also A up the bottom of the pipe. I used electrical insulating tape for this.

I do it with PE-foly, but i think, there is no difference if I do it with or without insulator

Quote
The highest voltage I got was 66volts open circuit voltage, using 83 copper pipes about 7 inches long, filled them with dirt, then put a zinc coated 4 inch nail as the center electrode. These were all connected in series.

great! I put more copper pipes in the ground.

Peter

To Jim (electricme) and all Stubblefield coil builders!

I looked at the photos of your new coil attempt (the cut out disks) and the following came to my mind (see also the attached picture which I fabricated with information I got from you lately, thank you very much again):

From the ratio of 1 / 2,4 (radius / height) I calculated

radius 3 1/4" --> height 7 3/4 " (needs 1650 feet of wire for the primary)

radius 4 1/8" --> height 10" (even more wire, it scares me to calculate the length of the wires)

To pedda !

As I see it, the best coil in this subject (thread) is the one from LaserSaber (go back to 213 and look at http://www.youtube.com/watch?v=lcjxA7bYUp0). But still, it would not drive a Joule Thief and the coil is still to small judged from the photos in the attached picture.

Many things are unknown, specially the answer to the questions "how to make a Stubblefield coil work" and "what to do with a secondary"? See my recent posts where I attempt to come up with the right dimension of a Stubblefield primary coil. I have yet now clue about the dimensions of a secondary besides the secondary in the photo with the Stubblefield coils on the couch.

Many speculate that a Stubblefield coil is not used as a galvanic battery but like a plug into the earth, but do not ask me what that should mean.

Try that for a start: http://www.hbci.com/~wenonah/history/nathan-s.htm

A big problem when experimenting with Stubblefield coils is the huge amount of wire necessary to build one as big as I estimate they have to be (at least a diameter of 80 mm ~ 3 1/4" and a height of 190 mm ~ 7 3/4", but even bigger would be better according to what I guess). We are talking of about 500 meters ~ 1650 feet of wire and more.

To say it in one phrase: nobody has built a Stubblefield coil that works as reported in vague stories from Stubblefields time and it is not known how to connect the ends of the primary and the ends of a secondary in order to get some usefull electricity out of such a coil.

But that should not keep you from trying. (Small coils are a waste of time).

Greetings, Conrad

Quote from: conradelektro on March 28, 2010, 09:40:46 AM

As I see it, the best coil in this subject (thread) is the one from LaserSaber (go back to 213 and look at http://www.youtube.com/watch?v=lcjxA7bYUp0). But still, it would not drive a Joule Thief and the coil is still to small judged from the photos in the attached picture.

I think, that JT needs DC-Voltage. But the earth current is AC. So the setup need diodes to make DC.

greetings

Peter