Joule Thief

[Artic_Knight]

this is complete hypothetical crap so if your still interested read on!

the way tesla spoke of this pancake coil as it was origionally thought to be was that it had a capacitive value, now that sounds to me like the longer the current is applied the more the magnetism added up. imagine if we had a coil designed like this! in water terms the deeper you go the greater the pressure is. relatively speaking if we use a "regular" coil as it was put it would allow the magnetism to freely leave the coil thus resulting in a river effect, water in equals water out. keeps flowing and moving but does not acumulate. now if we create a special coil its like putting a dam in place. now the water piles up and the water at the bottom of the "lake" or center of the coil has added pressure. a spring that has been squeezed and is ready to release its energy if you will. once we let it go it returns to normal shape.  IE if we applied this to the joule thief it would in effect continue to add to the magnetism in the torroid until we had it pull a trigger. 1.5v X (factor of time) equals a additional magnetic pressure we did not have before and then BANG!  we release all at once.  wonder what could be done with that?!?!

additionally i do not know at this time how we could build it and use it but i have seen some people report "wierd" effects coming from the pancake version.

also to note if the "tesla coil" as illustrated is a cut coil as i suggested then we would have to assume that the wires are not side by side but actually layered. this could make a difference as it may create the compression force of the magnetism suggested here.

[electricme]

@ Wilby,
I along with others have enjoyed your posts here on Pirates (bills) forum.
Perhapse Stefan accidently erased the "vegie" posts you mentioned, I also have accidently erased several PMs that I was about to post and had to rewrite them again, it's a real pain when this occurs.

If Stephan did it on purpose, there may have a very good reason for doing so, had a virus been hiding inside a post waiting for activation? and the safe way to protect his web site would be to remove a section? I don't know.

But if it was me, I would ask Stephan the "hows and whys" and see what he says first before you burnt your bridges.

jim

[jeanna]

duty cycle is how much of this cycle remain in a state versu the other state.

ex: for pulsed DC, it is how long it stay in the on state and how long it stay in the off state for each cycle.
for AC it is how long on the + side and how long on the - side.

@ AK.
I pretty much understand this part of your explanation.
I appreciate it. thanks.

I am not sure how jadaro used it.

He said 78% : 99%

I would think the 2 percentages would have to equal 100% unless 78% of the upper cycle and 99% of the lower cycle. ?? ??

Thank you,

jeanna

[Pirate88179]

@ Hazens1:

Great job over there!  Especially, like Jeanna said, the price on those leds, that sounds like a deal to me.

@TheNOP:

Yes, these are exactly the video courses I have been watching.  Dr. Walter Lewin is fantastic!  There are actually about 50 lectures in this series from the MIT website, and others.  I freely admit that the math part of this, which is a huge part, is beyond my current understanding.  He can go over my head about 5 minutes into the lectures but, I can then watch them again and again....sooner or later...something should sink in yes?

Yes, I agree with you on the laws and their specific applications.  I am not one of these people that say toss out all of the laws of physics, electronics, etc.  As you said, we have these for a reason and they have enabled our society to create some fantastic things by applying them.  We do not disagree on this at all.  I just wish I had your background and then, things might be a lot more clear to me than they are now.  But, I am working on that.

@ Al:

The lecture series that TheNOP posted are wonderful and I highly recommend them to anyone wanting to learn about physics, electricity and magnetism.  Back when these were taped, in the 90's, I believe he said just his one course cost the students $20,000.00!!!  So, free is really good.

Bill

[MrMag]

Measurement: Base - Collector: Across Inductor to Base
Duty Cycle: 78.6% : 99.9%
Frequency: 2.756 MHz:1.054 kHz

He is taking the readings from 2 different points.