Joule Thief

[TheNOP]

But I think that by "rate of change" he means the "speed of the change".

An example: the change between day and night repeats its cycle every 24 hours.
I would say that is a good comparison for a frequency.

But note that the "rate of change" is highest/fastest at dusk and dawn, since this is when the change from darkness to light actually happens.

So in spite of a slow frequency of a certain process, the "rate of change" can be quite high, if the change as such happens in a short timespan.
I sum it up:
"High (=quick) rate of change" for our purpose would consist in a "disruptive charge or discharge" which one could also call an impulsive change (as opposed to a gradual change for which the best example is a sine wave).

thanks oscar
you are right.

[gadgetmall]

Gadget:

I just had an idea! (maybe)  Get a bunch of these and superglue a small magnet on the back.  Folks that go camping can stick a shitload of them on the car roof while traveling to the campsite.  Leave them on the roof until dark and then, have all the light they need the rest of the evening!  I imagine like 30 of these in a tent would be some pretty good light.

Bill

ACTUALLY TWO WILL LIGHT A 10 X 15 ROOM . they COME IN GREEN and dark blue ALSO . i JUST ORDERED SOME MORE IN CASE THEY ARE NOT AVAILABLE . I GOT THESE FROM A GROUP BUY FROM ONE OF THE CANDLE FORUMS FOR A BUCK EACH . I HAVE SOLD THESE TO NEIGHBORS FOR 5 EACH AND THEY LOVE THEM AS I DO . VERY BRIGHT AND LAST LONGER THAN ANY GLOW PAINT OR MATERIAL I HAVE EVER SEEN . . THEY HAD TO GET A CRATE OF THEM .THAT WAS YEARS AGO . I CARRY ONE IN MY POCKET ALL THE TIME ..  HERE IS THE MANUFACTURE http://www.curtisium.com/

gadget ,

[jeanna]

So in spite of a slow frequency of a certain process, the "rate of change" can be quite high, if the change as such happens in a short timespan.
I sum it up:
"High (=quick) rate of change" for our purpose would consist in a "disruptive charge or discharge" which one could also call an impulsive change (as opposed to a gradual change for which the best example is a sine wave).

Hi oscar,
Thanks for your thoughts and welcome to this thread.  If you are intending to experiment... all the better!

In fact, it was through disruptive discharges = sparks, that Tesla created the pulse.

So, the frequency of the pulses would be how many can fit into a second as we have been using the word.

The rate of the change of the frequency, if I understand what you are saying, would be how fast the pulse goes from zero on the Y axis to its highest point. So, a slow moving 60 hz pure sinewave (according to the man), is not as useful as a fast spark would be.

It could be. I am still not sure, however the skinny spikes do have a strength of a sort that the smooth ones do not have.

Thank you,

jeanna

[Thaelin]

   To further the doubler/tripler circuit, I found this on the web. States that it will fail at around ten sections due to losses. Dont think it should go past 3 really. Watch out for the zaps if you do.

thaelin

[stprue]

   To further the doubler/tripler circuit, I found this on the web. States that it will fail at around ten sections due to losses. Dont think it should go past 3 really. Watch out for the zaps if you do.

thaelin

The grounds seem not needed!  Do you know what benifit they may have?