Joule Thief

[Cap-Z-ro]

" One problem you will encounter down the road is that most multimeters don't handle highfrequency well.  Some radio people may know a scource for meters that measure this but I believe everything is measured in decibels. "


That info will save me some mis-steps down the road when I'm ready to start throwing something together...thanks.

Great spirit of egoless sharing going on here.

Regards...

[innovation_station]

@ gadgetmall ..... 

you do have 2 of every gadget knowen to man lol 


i see your point tim


i have an old tube style scope.... i might hook it up but it would be better if you would join in the fun ....


and  offer your experienced skills to the goal....

ist!

[Mk1]

@gadgetmall

Its all the same your rod are under magnetic influence of the electric flow, When that flow is cut from dc (not ac)You get hemf (bemf) that induces the core (the shape dose not mater, its just geometry) That hemf manifest it self violently , creating i implosion effect inside the coil and core (high negative spike) on voltmeter , magnetic waves(eddy current is emitted) that can be pickups by radio or nearby core, we can also hear it at some freq.
Every forum of energetic nature are working with that same and simple thing , call it like you will , you need magnetic to get electricity(except some heat conversion system (including solar) or galvanic(its all we really need,Via Bagdad). To get the picture think no look at it in action http://ca.youtube.com/watch?v=X-hBMyaigqI.The air hole created imploded the bottom of the beer bottle. That same reaction is created in the coil , and manifest it self in many ways.

I hope it made some sense , sure not,but that another story .

We just need some new ways of seeing things.(or 100 years old way would do)

Mark

[Pirate88179]

MrMag:

Thank you for your explanation on what would be "basic electronics" to some, but to me it is essential to know this stuff.  I have learned a lot on here since the topic started.  I have been reading electronics books left and right, and listening to you guys explain stuff and also watching videos on electronics done by MIT professor Walter Lewin.  I am advanced in some areas but also find that I do not know some things that even basic electronics courses would teach.  I thank you, and all of the guys here that know more than I do, which right now, might be most of them, for sharing your info.

I have 5 electronics books but not one of them speaks of supercaps as I guess these are newer than my books.  Also, none of them mention the joule thief circuit even though they brush on the principle when speaking of induction coils. (very little)  I was taught by my Dad that the key to learning is to know what you know, but also know what you do not know and to not be embarrassed to admit that you do not know something.  A famous quote from Albert Einstein is an answer to a question ( I don't know the question) in which he said....."I don't know."  If a guy like that can admit that, I guess I can also.

@ All:

Just a reminder that since our topic is so successful (read, long) there are folks coming in here that may go back 10 or 20 pages but have not read it all from the beginning and I have no problem with folks reposting something that was discussed on page 5, if it is relevant to what we are doing presently.  Heck, I have gone back 2 times and started over reading this topic and you would not believe the important stuff I had missed.  Probably this was because I was not at a certain stage where I needed that info, and now, I am and it is all there, just hard to find.

So, once again I wanted to thank each and every one of you for your spirit of cooperation and sharing information that will help all of us.  Thank you.

Bill

[TheNOP]

NOP,  the circuit needs to be broken and the meter needs to be in series, period. All of the current needs to go through the meter to get a proper reading. The shunt in the meter is used for the meter to get it's reading from.
In a parallel circuit the voltage across the branches of the parallel circuit are the same. What is different is the current. To get the total current, you add up the currents flowing through each branch. This is why the meter needs to be placed in series and not in parallel.

Sorry to keep harping on this but if these measurement basics are not followed, your results will not be right.

i agree completely with what you are saying and i have say exactly the same.

what i was pointing out is the faq that IST was trying to measure the total amps output capability of his JTs

when there is no load, dead short condition, what is parallel and what is series.

examples:
how would you hook your ampmeter to check the max current output of a AA battery ?
would you have to change probe emplacement to read volts ?

those are not questions for you, they are just an examples.


but here a question for you.
can we get over it and continue experimenting with jt ?