Second Stage Joule Thief Circuits

[jeanna]

the toroid i have will charge a cap alittle passed 1200v dc.. but once this circuit is running i can't get my scope near it.. it will start giving weird readings without hooking the probe up thats 2-4 feet away.. this is the same scope i have if anyone know how i can shield it
http://www.tequipment.net/Velleman_hps10se.html
robbie

No, you answered that question.
Please keep the scope safe.

I am still puzzled about 2 things.
why you are running 4 neons and not an additional filament or even halogen bulb? Is this still not able to run a filament bulb here?

and

If you blow the 4w filament bulb can you not solve this problem with a 7w bulb?
Or does it refuse to light when it is higher than 4w?

jeanna

[kooler]

jeanna
the neons are for triggering the triac
so if you had one neon on it, it would open at 90-100 volt.. once the cap charge up to the required volts you want.. so if you had two neons in a series .. the triac would dump the capacitor at 150-180 volts
and 5 neons in series will dump around 280-295 volts..

for some reason the neons trigger the triac better than a diac or sidac..
just keep in mind that once a scr or triac open .. they won't close till the capacitor is empty..
so even if you can charge a high micro farad cap really fast you still won't be able to dump it at a high frequency..

this has been a trial and error circuit for me.. mainly because i don't know the math.. haha

out
robbie

[jeanna]

jeanna
the neons are for triggering the triac
so if you had one neon on it, it would open at 90-100 volt.. once the cap charge up to the required volts you want.. so if you had two neons in a series .. the triac would dump the capacitor at 150-180 volts
and 5 neons in series will dump around 280-295 volts..

for some reason the neons trigger the triac better than a diac or sidac..
just keep in mind that once a scr or triac open .. they won't close till the capacitor is empty..
so even if you can charge a high micro farad cap really fast you still won't be able to dump it at a high frequency..

this has been a trial and error circuit for me.. mainly because i don't know the math.. haha

out
robbie

Good.
I guess I was thinking a smaller value cap would work better, because it could fill and dump faster.
This is not a dc circuit and the charge can go back and forth across a point in the wire, and could have the same effect on the filament as all one way.
I say faster since it doesn't need  to be a lot of charge if it is repeated fast.
That is what I think you are doing/showing.

So, what happens with  4700pF, or 680pf or even a 100pF.
they may be too small, but they may have the speed.
They may be found in the  cfl circuits ??

I am playing around with the trial and error too.
The information to calculate this is around, but it is never put together for this purpose.

So, since your little 4w bulb lights up, that means that you have .4amps passing the wires, which means the .043uF (=43,000pF or '433' ) cap is passing the 0.4A charge along fast enough to light the lamp steadily.
Can you put a different cap in there a smaller one and have it fill and dump twice as fast and end up with enough for an 8w bulb... then what for a 10w, 25w etc.

It is possible that this is as high as you can go, but I see evidence of more voltage in your circuit and that is another reason why I think you can go smaller.

If someone wants to check my math esp the decimals, and help further with the figuring I/we will be very grateful. If not, i will continue anyway.

I am working with a plain secondary and I may need to add your triac to be up to speed here.
Right now my scope batteries are charging.

Kooler, I am so glad you are doing this!
thank you,

jeanna

[jeanna]

Here Kooler,
http://www.coilgun.info/mark2/rlcsim.htm
I made the sliders go to sort of match your cap and 43mA, then I made a smaller inductor and the mA went up and smaller again and the mA went still higher. The freq is in the upper right hand corner. That tells a tale too.

See what you think.

jeanna
the last one is 400mA just from changing the inductor value!

[sirmikey1]

Kooler,
   Don't know if you've noticed, but you are using KV and Gadget is not, which is a good way to test weather or not KV expands/enlarges the energy field, adds energy (Don Smith's OU Claim).   
  Many thanks for all of your work here.  Anxious....
Cheers,
Mikey