Joule Thief

[Mk1]

@Jeanna

Ok i guess you tried all 4 different ways to connect them in series , and you could not the the voltage higher , the freq change so its hard to say if you improve things , this is why i use the pot so i get the best freq for the jt coil configuration ( it just means jt coil count ) this is the reason i tried to tell everyone from the start , when you are making changes in the jt coils , if you have 2 coil at 15hz 80 volts , then connect them together and get a 30hz you will not have the 80 volts per coil you need to set it back with the pot at 15hz .

Also the coil may not be matched .


Mark

[jeanna]

Thanks Mark,
I will be away for the evening so I cannot continue this but I will in the morning.

I find it amazing that you double the frequency when you double the volts.

Have you seen this on a scope?
How are you measuring the frequency?

I think I know how you measure the volts.
I did it for a while too., but not frequency.

thanks,

jeanna

[electricme]

Electricme

This is the tesla book http://www.scribd.com/doc/13040608/The-Researches-of-Nikola-Tesla-1894

Thanks Mark
I appreciate this

jim

[TheNOP]

I find it amazing that you double the frequency when you double the volts.

Have you seen this on a scope?
How are you measuring the frequency?

I think I know how you measure the volts.
I did it for a while too., but not frequency.

if he is like me, he assume that the frequency is changing.

but the proof, you are giving it to us.
you have prove this more then once already.
here a quote of your latess proof.

80V @15.3KHz

74V @ 11KHz

12.25v @ 15.5KHz

read this carefully, as it tell why what you are seeing is happening.
http://www.overunity.com/index.php?topic=6123.msg185106#msg185106

to elaborate a bit more.

impedence is just like resistance.
but it is not the resistance to dc as your dmm measure.
impedence is the resistance to current changes, AC or pulsed.

as you add turns you are changing the impedence.
if the impedence goes higher, the current goes lower, just like with resistors.
lower current mean a smaller mag field, so a smaller collapse.

by changing the base's resistor, you are changing the frequency.
if the frequency change, so do the impedence.

the game is to match the frequency to the coil(s) you have.
while taking into account that the toroid is only working at it best in a certain range of frequencies,
and that a load(s) will change the impedence too.

if the impedence change, so do the frequency of a jt, because of the way the transistor's base is triggered.

[Mk1]

@Jeanna

The numbers used in my last post are for giving explanation , are not based on reality .

I still don't see any harm in trying it my way , i did have enough success with it , lets see how it works for you , plus with all you know by now this should be a plus , to me it works better then trying and parts i have around guessing what will be best.

Mark


@all


Hiding the load from the source , think about that !