Joule Thief

[dog812]

This is why it is important to get the base resistor value way up.

I think you told us, but please again, how many lights are you wanting in a H Hoop?
It really shouldn't matter because you will probably put them in parallel.

I am thinking if you can get the base resistance (=frequency) up to maybe 15K ohm and yet have enough voltage to run the set in parallel, the battery should run a looong time.

I would like to light like 20 + in paralell.

What would i have to do to use such a hich resistor? More turns on the pick up?

what is your pickup's number of turns  ?
leds are in series or parallel ?

6 turns.. paralell

[jeanna]

All i am saying is that at one point , the base resistor value will not change the pickup coil voltage anymore.
I said most likely because i don't have a scope.

I believe this is not true.
I have gone as high as 50Kohm and xee2 has gone to 500kohm. As the value of the base resistor goes up and now we see the frequency goes up too, the voltage goes down.
It does change.

Like i said with 8 jt turns on my toroid , the voltage output is the same with any resistor value 1 k or 1 ohm.

I am talking about higher than 1K and maybe you do need a scope to see this.

So how can you find the sweet spot if it doesn't change the output voltage.

I don't follow what you are saying here.

You have found something very important and I am using your design.
Your design takes longer to make, so for some quick tests I use the others that are easier and quicker to put together.

For today's test I used the primary of the new MK2x and a simple turns secondary up to 9 turns. All I saw today was a confirmation that as you know, the volts go up when there are more turns in the secondary. (Of course they do it is basic transformer theory.) But when the volts went up today because of more turns, the frequency went down.
I needed this confirmation.

I think your work is terrific.
Do you have a house being lit or an electric stove or heater?
There is more to do.
Some of us need to understand the principles of this in order to continue.
My tests are often designed to show the principles.
I need them.
If you don't then that is OK.
We are all different and we all work differently even when our goals are basically the same.

thank you,

jeanna

[TheNOP]

page 236
"We may connect an insulated line to a source of such currents, we may pass an inappreciable current over the line, and on any point of the same we are able to obtain a heavy current, capable of fusing a thick copper wire." N Tesla

you are taking that out of context.

an autotransformer.

take 1 wire, make 10 turns, a tap, 1000 turns.
apply 120 volts/1 amp between the tap and the 1000 turns ending of the wire.
you will get 1.2 volts/100 amps between the tap and the start of the 10 turns.
all from same wire.

[Mk1]

@jeanna

You remember the first mk1 2x67 volts. I got the same voltage out of the pickup coil , the trim pot didn't change the voltage in any way , so 67 volt the value of the resistor didn't change the voltage at all. i got 67 volt with any resistor value.
67 no mater where my trim pot is set , any value gave me 67 volt.

i hope it will make sense now . And by the way IST found the same thing but on his toroid he needed 5 turns.

And that was with 8 turns on the jt side, the most important is not to forget the toroid is the boss .

Yes playing around with other things help understanding but ...

Did you at least try to tune it my way , maybe you would already know what i am saying !

Mark

All of you on here , at least try it my way once then do what you what!

Also when asking question , i see that people never do it right if you tell them how to do it right , but if you tell them what not to do then they will listen.

Hum...

and yes i still have plenty of stuff to show , but one thing at a time , what we are doing is old stuff for me , i did not really work on it since January , i am still waiting for more people to get where you are .



Edit , but remember that with 4 turns the resistor does change the pickup coil voltage!

So the system doesn't always work the same way, i will wait for you to say it again (mark was right again)

[jeanna]

I would like to light like 20 + in paralell.

What would i have to do to use such a hich resistor? More turns on the pick up?
6 turns.. paralell

I think you should be able to do it now.
Parallel is the same as one.
page 168 jan 21 is where my notes say this is recorded.

I lit 30 on one turn with the hybrid which was made with the primary like the evilmadscientise type and I ignored the 52 secondary turns but wrapped a single turn secondary around that and right off that single turn I lit all those lights because lighting them in parallel is like lighting one. It took 19mA from the battery to do this.

More turns will make them brighter until they start to blow from too many volts.
higher base resistance will lower those volts to a safe level and lower the amps draw from the battery.

So my tests from today were not a moment too soon, I guess.! (xee2 already told me this back in january.)
Please Try that and let us know.

Use only 1 led, because one is the same as 20 in parallel.
Add the turns carefully or add them til the light blows.
Then add resistance until the light doesn't blow anymore.

You will blow lights this way, but you won't need a scope! 

This way you will find the right number of turns to get the volts you need and the highest base resistance you can use to save on the amps draw.

capiche?

jeanna