Joule Thief 101

[shylo]

Sorry to interupt but I just have to ask , what happens if you put say 50 volts in , will it run a load that needs 120?
I tried to build a JT ,could never get it working.
Can you up the output enough to run larger loads?
I'll understand if none answer.
artv

[Pirate88179]

Sorry to interupt but I just have to ask , what happens if you put say 50 volts in , will it run a load that needs 120?
I tried to build a JT ,could never get it working.
Can you up the output enough to run larger loads?
I'll understand if none answer.
artv

I have many JT circuits that you put in 1 volt and get out 400.  Another one will put out almost 900 on a single "dead" battery. (Jeanna Circuit) You do not need to input 50 volts.

Bill

[tinman]

 author=MileHigh link=topic=8341.msg475054#msg475054 date=1456045528]


How a Joule Thief works:  https://www.youtube.com/watch?v=0GVLnyTdqkg

Stop beating around the bush and put up or shut up.
[/quote]

I never even asked you the question with respect to the EMJ story so it is impossible for me to "fail to provide enough information in my question."

I will take that as a no--i cannot answer my own  question.

I think somewhere in this thread there are about 10 words from you about how a Joule Thief supposedly operates at low voltages.  Is that your "working theory?"  If that is all you have, then copy and paste it here and add a lot more than that.

Like i said MH--you do not read all of the thread's. I think you more !pick and choose! bit's and pieces that suit your need's. The post with my explanation is closer to 400 word's with scope shot's. Some how you managed to miss that But you will look silly-!even to your self! when you find it--after your continual banter about me posting a description of how a JT works at low voltages--something you your self couldnt do.

For example, I am sure that if you wanted to describe how a gasoline engine works you could write up a full page of text description.  But we are NOT talking about gasoline engines, we are talking about how a Joule Thief operates at low voltages.

It was you that said you can determine how a gasoline engine works,but you also asked what determines the frequency at which a JT would oscillate--so i asked you to show what determines the peak RPM of a gasoline engine,without me giving any specifications of the parts used--just like you refused to give me any specifications of the components in the JT circuit you wanted me to explain.  Like i said MH--it cant be done without these specifications. For example-if i make up a circuit,and use a set length of wire for each coil, and use a ferrite toroid,then the JT will oscillate at a certain frequency. If i do nothing other than change the ferrite torroid out for a steel laminated torroid(while everything else remains the same) then the frequency would drop by over 1000 %.

So you see MH,there is no way of saying what the oscillating frequency would be for a JT circuit without the required specifications-just like you could never work out what the peak RPM of a gasoline engine would be without those specification's-nor that stupid and incomplete question you asked EMJ. You try and trap people like this all the time MH--but they are all waking up to you.

So as i !HAVE! answered your question in detail(although some how you missed it),you now answer your own question you gave EMJ,with only the information you provided
What happens when you apply a voltage source to a coil ?.

You cannot answer your own question MH--you know that,as there is not enough information to answer it.
Is the voltage source an alternating source,or a direct source.?
Will there be enough current available to maintain this voltage source when it is applied across the coil?.
What kind of coil?. E.G-dose it have a hole through the middle,or is it tightly wound from center-out,so there is no hole through the middle-->this will determine the magnetic field produced by the coil.
What kind and size of wire.
How many turns?
The list go's on MH.
Your question cannot be answered without further information-->your question was loaded--a bait for EMJ-->just like your question on what determines the frequency of oscillation in a JT circuit. That list is about a long as the required information needed to calculate the peak RPM of a gasoline engine.

Please explain to the readers how a Joule Thief operates at low voltages.  Please see the attached annotated timing diagram and the linked YouTube clip as examples of how you can make an effective presentation.

As i have said a number of times now,i have done this already--but you have some how missed it.'
Im not doing it again MH,just because you lack the ability to read all parts of a thread.

Now,how about you answer your own question-what determines the frequency that a JT will oscillate,and i will add everything you failed to take into account.


Brad

[MileHigh]

Right so you are "fighting" with me and you are so immature that you refuse to link to what you are talking about.  So you will get your jollies when I go look for it.  Get yourself a box of Kleenex.

[tinman]

Right so you are "fighting" with me and you are so immature that you refuse to link to what you are talking about.  So you will get your jollies when I go look for it.  Get yourself a box of Kleenex.

As expected

https://www.youtube.com/watch?v=QFM9fxfONVw