Joule Thief 101

[EMJunkie]

Chris, what I said about events pertaining to you and your "partnered output coils" is absolutely true and you know it, we both lived through it together.  So you are lying, please go back to your thread.

I have no desire to clog this thread with off topic Truth,

Appologies Resonanceman!

   Chris Sykes
       hyiq.org

[hoptoad]

snip...
- the transistor will not switch on "harder," it is already ON.
snip..

That's exactly what it will do. In bench parlance, 'harder on' or 'hard on' is merely a descriptive term in broad general use.
There will be a higher current through the base resulting in a current gain through the collector. (If the base supply voltage remains the same but the base resistance decreases, or the base resistance decreases at a larger proportion than a drop in the base supply voltage).

That's exactly what the transistor is supposed to do. It is a dual current switch with a multiplication factor for the collector current associated with and proportional to the current in the base to emitter junction. I built analogue amplifiers for a living many years ago and the characteristics of transistors are well known and specifically chosen for their variable 'on' state. HFE and hfe of bi polar transistors was/is important to its current switching characteristics.

In analogue amplifiers, transistors are generally biased on at all times with the minimal amount of ambient current use. The signal to the base (via a dc isolating capacitor) causes the transistor to go from just being 'on', with minimal ambient current to being 'hard on' as the signal level dictates. 'Hard On' is merely a very common expression to indicate the variability of current between different states of 'on'. Of course it's also a much more widespread vernacular expression   bearing little to do with all things electronic.

Without a signal, analogue amplifier output transistors are still switching a small amount of power because they are biased 'on'. With a signal applied, the same output transistors can be 'hard on' to the tune of hundreds of watts. But they were always 'on', and never were they 'off', until you turned the whole amplifier off, of course.
Cheers

[MileHigh]

I understand what you are saying but it doesn't apply in this case.

[MileHigh]

Webby, I believe you are out of your element when it comes to electronics.  I think you should just keep your hands in your pockets, sit back, and watch the show.

[tinman]

So, you have given your answer.

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MileHigh

MH
It is painfully obvious that you really do not know how a transistor operates,and how reducing the base resistance actually dose exactly what i said it dose as the supply voltage drops.

You are having another ICE moment,where you are making incorrect judgments on things you know very little about.
Now how can i be sure of what im saying is true--well i have seen it right before my eyes on the bench MH,and i know how transistors work. Are you unaware that the base current is additive to the collector current?,and if we increase the current to the base,then we increase the current flow through the inductor in the case of the common JT circuit. Do you know how an audio amp works MH?.

the transistor will not switch on "harder," it is already ON.

Bullshit

the transistor will not stay switched on longer,

More bullshit

you are making a totally blind and completely wrong assumption based on your false belief that the transistor has been switched on "harder" and "'harder' equals 'stay on longer.'"

And more bullshit. There is no blind belief,they are facts based around experiments and bench time.

since the transistor will not switch on longer, there will not be any "maintaining a magnetic field of the same value as the battery voltage drops."

And one last drop of bullshit.

So, you are showing the world that you don't understand how a Joule Thief works.  You are showing the world how you made a blind "Doh!" assumption that lowering the base resistance would increase the brightness of the LED.

MH.
I am starting to think some brainless twat has hacked your account,as the MH i know is much smarter than this.

My ass, you clearly don't know what you are talking about.

At this point in time MH,we have reached a very big impasse.
Here is the problem you now face.
If i post a video(along with a schematic of the test setup)showing what i said to be absolutely correct,then this leaves you in a very bad predicament. If i !once again! prove you wrong,people will no longer take what you say as being correct. Those that still had some faith in you will loose it for good,and you will be nothing more than some one who is just here to interrupt threads,by way of posting garbage.

MileHigh
Please take some time to think about the statements i made.
1-we can increase the current flowing to the base of the transistor, as we decrease the base resistance along with the supply voltage drop.
2-which switches the transistor on harder and longer, resulting in a pulse width increase,
3-thus maintaining a magnetic field of the same value as the battery voltage drops
I really do not want to have to make this video,that clearly shows that everything i said above is true,as this would be detrimental to your standing here at OU.com
But i will do it if you continue to call everything i say !rubbish and wrong!.

Your mistakes on the ICE can be overlooked,as you are not well versed in ICE's and there workings.
But the JT is something you pride your self in,and this is suppose to be your guru status here-an EE who knows his stuff.

I think the reason you have come at me like a raging bull,and are dismissing everything i say as rubbish and incorrect,is because you dont like and cannot believe that some one like myself could possibly know more than your self in such a short time of experimenting.

So please MH,understand that i have already carried out the test that confirm my statements.
Please know that the test setup i have used produces absolute result's that backup my statements above.

I am giving you the opportunity to rethink/reconsider your dismissive claims against me.
I am giving you the opportunity to !debate! the effects that reducing the base resistance has as the supply voltage drops.
But as i said above,if you continue to dismiss everything i say,or continue to say that i have no idea as to what im talking about,i will make that video,and leave you to deal with the consequences.


Brad