Joule Thief

[Pirate88179]

Quote from Jeanna below:

"45r    456v-475v     4.65-4.16KHz then got quiet again. still there but lower volume?"

It was explained to me a while back that it does not get quieter, it is just that the frequency goes higher than out hearing range can detect.  This should be around 20,000Hz but probably less for an old guy like me who played drums in rock and roll bands for over 20 years, ha ha.

The frequency I am talking about it the sound freq. which may or may not correspond to your electrical freq.

Bill

[Mk1]

@jeanna

Just to check the tab of the 2n3055 (case) is the collector.

Mark

[jeanna]

"45r    456v-475v     4.65-4.16KHz then got quiet again. still there but lower volume?"

The frequency I am talking about it the sound freq. which may or may not correspond to your electrical freq.

Bill

tcsh di dit tsch di dit tsch...
Ah those lovely sounds of the top hat. It hurt my ears when I was in my twenties!

I think that it is the same. the frequency of an electrical device will at least sympathetically resonate with other things at that or harmonics of that frequency, right?

I think the interesting thing about this is that it is nowhere near the 20k mark. And never was, It starts well within the hearing range at 13k but is softer than my white noise. (or tinitis, or all of those things together- but certainly not age!  ! )
Then at this particular spot it cranks out the volume.
I guess you have not had the same thing.
Maybe someone else with a big toroid. Maybe the mass of the toroid gives the volume a boost. A magnetic speaker without the paper??

Altrez, do you get big volume on the whine ever?
Stprue is out of town, too bad. He has the exact one I have.


jeanna

[jadaro2600]

I haven't touched a jtc in months now...they're all just sitting there.

I have some rather husky transistors and an unused car battery here, I was thinking of a few experimental setups:  Does anyone know how I can limit the current from the source and still maintain the voltage?

Also, I was going to get a few large florescent tubes to try and light them.  The idea is to use a common solar voltage / storage source and create efficient light.

[jeanna]

@jeanna

Just to check the tab of the 2n3055 (case) is the collector.

Mark

Yes, I have a little machine screw holding a sort of soldered wire to the hole in place as the collector wire.
Why do you ask?

jeanna