Joule Thief 101

[tinman]

You might consider repeating that video with the secondary connections flipped...

Will do.


Brad

[MileHigh]

Well MH,it's been a hoot.
The one thing i will say is,thank you for all of your help over the years-you have taught me much.
I guess there comes a time when we  have to agree to disagree.
There is no point in continuing  to argue about resonance,as it makes more sence to put what we know (believe) to work,and see if we can make something of it.

Brad

Well I wish I could say, "It's been real," but I can't.  It's been absolutely unreal.  So unreal that at the end of this discussion you come up with a crazy half-definition of "resonance" where only an externally driven resonant system is "resonance" but a resonant system resonating stand-alone all by itself is "not resonance."

It's so unreal that you are doing a simple college physics experiment and yet you try to claim it is "not in your books."  There were probably about a dozen arguments with you in this thread where you were absolutely unreal.

It looks to me like you are going to be spinning in circles for a long time.

MileHigh

[verpies]

How does the air drain away the energy without changing the frequency,

Air changes the frequency a little. In other words, in vacuum the string would vibrate a little faster...and much longer.

This also happens in LCR circuits, where the resistance slightly affects the self oscillation frequency in an underdamped transient response.  AFAIR it affects the Alpha parameter and the Neper frequency.

[tinman]

Well I wish I could say, "It's been real," but I can't.  It's been absolutely unreal.  So unreal that at the end of this discussion you come up with a crazy half-definition of "resonance" where only an externally driven resonant system is "resonance" but a resonant system resonating stand-alone all by itself is "not resonance."

It's so unreal that you are doing a simple college physics experiment and yet you try to claim it is "not in your books."  There were probably about a dozen arguments with you in this thread where you were absolutely unreal.

It looks to me like you are going to be spinning in circles for a long time.

MileHigh

All i can say is,i have applied what i know to this thread.
As you know,ICE's are my life--even though the ICE is a very bad and inefficient design for an engine/prime mover.

I found Walter Lewin's video's to be very educational and spot on.
In the one below,he shows the difference between a harmonic oscillator and resonance-->you will have to watch the video before this one in regards to harmonic oscillators,and harmonic oscillation.

At the end of the day,we can only do our best to associate what we know from what we have learned by those that have high standing in the subject matter.

https://www.youtube.com/watch?v=1K5p9DfsXGo&list=FLsLiBC2cL5GsZGLcj2rm-4w&index=1


Brad

[poynt99]

I found Walter Lewin's video's to be very educational and spot on.

Spot on with reference to?

btw, Lewin is good, but he gives at least one lecture where he unfortunately leads his students astray.