Joule Thief

[jeanna]

Hi everybody,
I found what I was after.
As my head hit the pillow last night I wondered if the question I thought was so simple might not have been so.
I appreciate ALL the help you all gave me and, of course,  none of it is ever lost (not on me, anyway).
What I realized is that nobody has asked the question I thought was so simple so of course, nobody had an answer to it. duh! I apologize for any hurt I may have caused, by my dogged persistence!

I found a website today that acknowledges the element I was asking about.
If anyone lurking or otherwise wants to read the page or the website, I provide the page here:
http://www.sentex.net/~mwandel/cannon/sparky.html

The emphasis is mine here,
Here is the important part:

An ignition coil is essentially an autotransformer with a high ratio of secondary to primary windings. By "Autotransformer", I mean that the primary and secondary windings are not actually separated - they share a few of the windings.

The ratio of secondary to primary turns in an ignition coil is somewhere around 100:1. The ignition coil is operated directly off a 12 volt source. However, the ignition coil does not work like an ordinary transformer. An ordinary transformer will produce output current at the same time that input current is applied. An ignition coil actually does most of its work acting as an inductor. When the ignition coil is connected to the battery, the inductor is 'charged' with current. It takes a few milliseconds for the current to build up the magnetic field - this on account of reverse voltage caused by the increase in magnetic field. During this short charging period, maybe a thousand volts are produced at the high voltage terminal, not enough to actually cause a spark.

The actual spark is generated when the breaker contacts open. For an ideal inductor, the current and voltage relate by:

      V = L dI

      Where V is voltage, L is inductance (in henrys) and dI is the rate of change of the current.

Thus, seeing that L is constant for the inductor, the abrupt change in current will cause a very large voltage to be produced. This produces a very short, very high voltage spike. Of course, the change in current is on the primary side, but because the primary and secondary coils have a large mutual inductance (this is where the transformer part comes in), you get a spike on the order of 100 or more volts on the primary, and 10000 volts on the secondary. Even the primary side of the coil can give you a bit of a jolt if you hold the wires wile disconnecting power. Also note that any contacts you will use will get a lot of sparks, also on account of this.

I am also posting this here because of that formula, and because this whole thing is very important with respect to the Tariel invention and the earth battery/inductor experiments.

So, thank you for your indulgence and again for your patience,

jeanna

[innovation_station]

@ST

YOU HAVE THE FEROITE CORE OR SOFT IRON CORE INDUCTOR ..  RUN REALLY FAST LIKE A TURBINE ENGINE ...

then you charge your cascade up  send it to a tesla primary ...  and it is HIGH FREQ...  so it is a little more safe .. till you change it through conversion from cold to hot ..

but i think you may want to BATCAP IT AND USE AN INVERTOR OFF IT ... THEN THE HIGH FREQ DONT MATTER ...

THE SUPER CAP WILL DO THE WORK

and find a rectifier tube ...  of low resistance...   

eye st

are you telling me you built a flux capacitor for a time MACHINE ....      back to the future ... 

[xee2]

@ jeanna

Hi everybody,
I found what I was after.

I assumed you already knew that since that is how the JT works when it has a pickup coil. Anyway, I am glad you finally got your question answered in a way you can understand. Hopfully that explanation can help others understand also. Thanks for posting it. By the way, if you look back at my tube circuits you will see that sometimes I tied one end of the pickup coil to one end of the collector coil. So if you have duplicated any of these circuits you have already used a transformer with one end of each coil tied to the other coil. So having the ends tied together is really nothing new.

[innovation_station]

do you have a link xee?

i never knew your a tube guy ... 



well now.... 

ist

i do have a few tubes and access to some nice tube toys... 

ill even be sooooo nice to post pictures of the devices and schems.. 

when i get there ...  1 is the resonat tune corce and fine tune charger ...  charges i think 12 12 or 6 volt batteries at 1 time ... all tube driven ...  second is a tesla coil of sorts i need to find a replacement tube for it to run it a friends father made it ...  sounded pretty kool as the story goes ...   

i have not seen the second unit yet ....

but it strikes me as a tesla cone cadisous style device ...  thats just wild to see in action as i hear...

it was described to me a long time ago.. and it came up in a most recient conversation lol

[xee2]

@ ist

i never knew your a tube guy ... 

Fluorescent tubes