Joule Thief

[Pirate88179]

Jim:

Do your pms not work either?  If not, let me know and I will copy and paste your post to Stefan.  Are you running adblocker and no script yet?  If so, look down in the lower right hand corner of your page, unless you say it is ok, it will block some items on a page, the same with adblock at the top right side of the page.  Most of them, you don't want, but some, you do.  It will learn as you tell it.

Bill

[TheNOP]

from what i understand about florescent lights they love high frequencies, if thats true then should a curcuit designed for higher frequencies be better?

yes, they love rf.
22kHz and 66kHz unit for florescent lights do exist and they are way more efficient then normal ballasts.
the problem is sheilding the rf, to be fcc compliant, cost more.
that is why they are not available on the public market.

according to the work posted by jenna putting a base cap on this at 1f i believe should generate a wonderfuly high frequency. also increasing the base resistor will help a bit, yes it lowers voltage so we can utilize the other technique posted in this forum of having a small primary large secondary (correct me if i got that backwards) to raise the voltage back up. if nothing else a secondary transformer could be utilized to step up the voltage once the desired frequency was met.

problem is no jt is the same, a cap value might not work the same on all jts.
same for the number of turns

additionally i am interested to see if adding the cap accross the coils will help. with jennas work and utilizing the caps ability to create a more true AC current i think we could do the following curcuit to potentially maximize the lighting of a florecent.

i noticed the cap accross the coils does dim the light to a led but it should be generating a more natural AC instead of pulse DC that looks like AC. this curcuit i would think would help with the power draw and lighting the light.

i dont know what the optimum uf would be for the cap accross the coils however.

tell me what you think.

in series with the collector coil, you will limit the current by the cap value. ex: 1mF = 1miliamp

in parallel, i am not sure.
it is related to the pontential difference between both coils.

[jeanna]

@ jeanna

Nice looking charts.

Thanks. It is tricky because it is an html editor and it is an html table.

Are all of the voltages measured between the two pickup coil leads? If not, can you explain where the voltages were measured.

Yes, and that is the reason I do not have voltages and frequencies for the set with the led across the secondary. I would like to know if there is a way to read them accurately at the same time.

thanks,

jeanna

[electricme]

@Bill,
WOW, three posts on this forum while I ducked out for 5 minutes. Ha ha.
I got your email Bill, I want to post these circuits first, then while the 2 emails are downloading, Ill buy a carton of milk, I like my cuppa T, lol

@Jeanna,
Thank you for the encouragement, its very welcome.

@all my main gole here is to get some output power from my JT battery, to drive a 12v DC fan or wiper motor, if this means using up the amps in the battery 7 times faster, then so be it.
I can always recharge the battery.
After this is working, then I want to syphon some of the excess energy back into the battery.

OK, here are the circuits.

0682 = Whole circuit, it is drawn on a A4 size sheet but will look much smaller on your PC.
0689 = I cut the sheet in half so to speak. This is the LEFT side of the crt
0691 = Right side of the circuit
0692 = Close up of Toroids, showing 1 section out of 7, X by 7 to get 7 times output.
0692 = Close up of how I soldered in the 2nd transistor, which is powered off the 1st JT transistor.

jim   

[xee2]

@ jeanna

I would like to know if there is a way to read them accurately at the same time.

I am not sure if I understand correctly. But, when you put an LED between the two pickup coil leads (or anywhere for that matter) the LED will act as a voltage limiter and limit the voltage to about 3.5 volts. If two LEDs are put in series, then each one will have 3.5 volts across it and so two in series will be a 7.0 volts (etc.). Thus the LEDs will set the voltage until they exceed the available voltage. So I guess the answer is no. If that is not what you were asking, please ask again.