Joule Thief 101

[MileHigh]

Oh dear.
Tell us all here how the internal combustion engine works MH,and what RPM it will be capable of achieving. Im not going to give you any specifications about the parts used in that engine,nor will i tell you if it is a gasoline engine,or a diesel engine. Im also not going to tell you whether it is a piston engine ,or of a rotary design-->but i expect you to be able to tell us what will determine the RPM of the engine --much like you asking me what will determine the frequency of a JT circuit without any component specifications.

Indeed, your example backfires on you, pun intended.  You can indeed describe how a gasoline engine or a diesel engine operates without any specifics.  You can indeed discuss approximate top speeds for different engine designs without having to be specific.

And that's what I am asking you to do since you claim you can do it:  Describe how a Joule Thief operates at a low voltage and explain what determines the frequency of operation.  That's what I did for a standard Joule Thief at normal voltages and I did it without any component specifics.  I did a complete annotation of the timing diagram.  You should be able to do exactly the same thing for a standard Joule Thief operating at a low voltage.

But the reality is that it is pure BS coming from you and you will say anything to deflect away from this truth.

i am smart enough to say when I don't know something and you clearly aren't smart enough to do that.  You are the poor guy that holds his breath and turns blue all the time.

Mistaking "voltage source" for "DC voltage" goes back to the same old language comprehension and thought process issue that you have.

If you want to prove that you are not lying about knowing how the Joule Thief operates at low voltages, just explain it right here.  You cannot claim that you understand the process and then turn around and claim that you can't explain it, that's ridiculous.   So put up or shut up.

[tinman]

Indeed, your example backfires on you, pun intended.  You can indeed describe how a gasoline engine or a diesel engine operates without any specifics.  You can indeed discuss approximate top speeds for different engine designs without having to be specific.

Well go ahead--do tell.
Lets just stick to a piston engine,as you wish to stick to the JT circuit.
Dont forget to list and account for everything that will determine it's RPM peak.
Lets see if you can put your money where your mouth is.

And that's what I am asking you to do since you claim you can do it:  Describe how a Joule Thief operates at a low voltage and explain what determines the frequency of operation.  That's what I did for a standard Joule Thief at normal voltages and I did it without any component specifics.  I did a complete annotation of the timing diagram.  You should be able to do exactly the same thing for a standard Joule Thief operating at a low voltage.

Once again--not reading all the thread.
I have already done this MH. If you have misses it,then go back and start reading.

But the reality is that it is pure BS coming from you and you will say anything to deflect away from this truth.

The truth is MH,i have already explained my working theory,and you shy'd away from trying--because you cant.

i am smart enough to say when I don't know something and you clearly aren't smart enough to do that.  You are the poor guy that holds his breath and turns blue all the time.

I have to ask--if you dont know the answer to something,then how do you know my answer is wrong?.

Mistaking "voltage source" for "DC voltage" goes back to the same old language comprehension and thought process issue that you have.

There ya go--doing the old !switcharoony! again.
Due to the fact that you failed to provide enough information in your question,i used one of the most common voltage sources--that source being a DC source.
So the fail is on you,and once again,i see you cannot answer your own question-->another diversion.

If you want to prove that you are not lying about knowing how the Joule Thief operates at low voltages, just explain it right here.  You cannot claim that you understand the process and then turn around and claim that you can't explain it, that's ridiculous.   So put up or shut up.

Go back and find my well explained answer MH--it is there,and you know it.

Fail after fail on your behalf MH.
This thread will be a great read for all those here--> a character builder for your self MH.
And dont go deleting anything.


Brad

[sm0ky2]

author=MileHigh link=topic=8341.msg474965#msg474965 date=1455982986]

The term !blocking oscillator! is a bit of an incorrect description.The current flow isnt actually blocked,the current path is disconnected/becomes open--nothing is actually blocked.
Brad

I must interject here...

When operated outside of the linear mode of the transistor (digital switching), the circuit acts as a blocking oscillator.
it clips the waveform, the resultant peaks are represented by the inductor action, not the transistor, or a combination of the two.

The premise of the discussion I began with, took the transistor out of this digital mode of operation.
Thus, MH's perspective does not apply to the JT in resonance mode.
But is not necessarily untrue.

[MileHigh]

Focus:  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 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.  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.

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.

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

Stop beating around the bush and put up or shut up.

[Magluvin]

Tried 3 different transformers, all with equal 1 to 1 turns on the primary and trigger coils. In all cases once I get them to be in the clean sine zone, there is very limited range in which I can get it to show before it cuts out completely. So maybe a different ratio of turns would be next.

I can see that when the circuit is running normal with say a 1k resistor, that there is more on time of the transistor than off/discharge. So I would like to change things to possibly get a near to equal on/off time when running normal mode, which would hopefully help in producing the sine, instead of the long on and short off time Im getting which would kill off any ringing of resonance if the on time is too long.

I suppose that more trigger turns would shorten the on time as it would increase the base voltage in a shorter time period than with a 1 to 1 ratio. So Ill go that route for now.

Mags