Joule Thief

[TheNOP]

From your top line, I think I need to put 2 300v caps in series to charge them. So, the rest of your comments mean I should not safely do this?

it mean that you can't connect the caps in series while they are connected in parallel to the pickup coil.
it is an imposibility  

and if you disconnect one then connect it in series with the other cap and connect it to the pickup coil too,
you will have a suprise, perhap even a fryed coil.
300 volts would flow back into the coil.
caps in series = 600, coil provide only 300 = diff of 300

45khz
65volts
with 517ohms at the base resistor.

Yes?

except for the resistance value, time rate of when 2 other values were taken ?
if it was low then yes, they are what you got.

alway use the lowest time rate when reading the values.
ex: 100ms

higher time rates are to get a better indeep visual of the trace(also called signal or wave).
ex: 1ns

this will give you better averaged and calculated values for "non perfect" signals.
by "non perfect" i mean when cycles are not always the same in a 1 second peroid.

[jeanna]

this will give you better averaged and calculated values for "non perfect" signals.
by "non perfect" i mean when cycles are not always the same in a 1 second peroid.

This makes sense.

Quote from: jeanna on April 20, 2009, 08:37:31 PM
45khz
65volts
with 517ohms at the base resistor.

Yes?

except for the resistance value, time rate of when 2 other values were taken ?
if it was low then yes, they are what you got.

I don't understand your question.
It may be about the english.
Except for what resistance value?
It was the base resistor when I made the test (517 ohm)
All 3 things go together.

I changed the resistor until I got the highest voltage, then I moved the time markers to see what the frequency was.
That is why they all go together.

I will take out a turn or 2 and repeat this business.

thank you,

jeanna

[Artic_Knight]

here is the tesla patent that resembles our work here on the joule thief.  its initial dual coil design gets the high frequency (without need of transistor) then runs it through a second transformer for the extra kick in high voltage. and to think there could be a high voltage high frequency regulator with nothing but a copper wire

[jeanna]

@Mk1,

I don't seem to be getting a big difference with this filter when I lower the number of turns.

I went down to 1 turn of each wire on one side and 3 on the other.

The frequency of a single wave could be found at a number of places.
It makes me think of harmonics.
The volts were about the same when I changed the resistance at the base.
The only thing that changed a lot was the base resistance to achieve the volts at any frequency.

I think the first one is the best.

Perhaps I already knew that and that is why I started there.
I cannot find it in my notes, but it is likely that I already determined that 6T,7T or 7T,6T is the best for the filter.

I may wind a MK1 with what wire I have left tomorrow.
I got the notice that my newbie wire and my Chinese LEDs are both on their way, so I may take a walk in the spring weather tomorrow, instead.

Maybe after a nights rest I will realize a different way to look at this.

thanks all,

jeanna

[jadaro2600]

I think we've reached an advanced level of understanding of the Joule Thief Circuit.  Progress continues to be made.


@all,

I was just wondering if it was the collapsing magnetic field of the coil to collector that is causing the voltage gains in the secondary - wouldn't the coil to base be interfering with the maximum gains attainable by the secondary?

I've wound a toroid with fine gage wire 340o then placed two addition coils, one in the gap and the one evenly spaced around the toroid.  there are nearly 150 winds of 30 gage wire for the pickup, there are 12 winds of 26 gage going to the base and 12 winds of 26 gage going to the collector.  Still, I get more voltage when using the 150 winds as the coil to collector than I do when using it as a secondary.

My secondaries work, just not very well.  I'm consistently having more luck with the coil to collector - which puts me in a position to damade the transistor due to over voltage.

*note, as soon as finals are over, I'll have time to wind a few MK's

@MK1, those are some interesting patents you've posted.  IS any one your favorite? ..any one inspirational?

I like older patents, that filers had to explain themselves clearly, so that the public could understand what was being said, this seems to have ceased with many filers, and things have become the art of vaguery.