Joule Thief

[gadgetmall]

@Bill
  Thanks for reminding me about Jeanna's work on the fuji circuit also . IF it had not been for her and everyone else like xee2 and Jim and you Doing Experiments on that fuji it would have jusy been the old Jose Pinto ( hope i spelled it right ) Mod.What i learned about it was from here and trying different things so i take only my % of credit . The whole belongs to the research group here . And you were the First to run 400 plus leds and make a video
I also wonder about Jim . I pray he well . By his recommendation i am taking non conventional medicine MMS to fight cancer . I feel a bit better , I dont know if it's actually helping me or not but i feel better.
Take care .

Al

[templer]

Replacing r2 with a 5k pot allows you to control the Bias(v+) of the transistor . This allows you to get the unit to oscillate at a lower volts thus the unit runs longer ........

replaced R2 with a 25 kohm pot. removed the led, the trigger trafo, the flash, the copper sticking. connected a tube (philips TL Mini 4W/33-640) to the pins of the removed cap. with tube it´s 99 v and without tube it´s 140 v - for both R2 is 15 ohm. R2 with 25kohm the tube doesn´t light, voltage is then about 52 volts. i tried several caps, elkos and others, parallel to the pot but no difference in brightness. but if i touch the tube or different areas of the board, brightness gets much higher.

brightness with a cfl is very poor and also just on one side of the cfl. but how can it be: the tube lights also when it is just connected on one end. if i touch it, it gets much brighter too. this works alos with a small 230 v/ac lamp.

i want it much brighter. so i will try different cfl. do the aa boards deliver a higher voltage? anyway i am looking for further improvements in brightness. tnx to pirate for the difference info. in a short time i  will get some kodak boards from a photo-shop and will test them too.
tnx for all the help
jerry

[dasimpson]

replaced R2 with a 25 kohm pot. removed the led, the trigger trafo, the flash, the copper sticking. connected a tube (philips TL Mini 4W/33-640) to the pins of the removed cap. with tube it´s 99 v and without tube it´s 140 v - for both R2 is 15 ohm. R2 with 25kohm the tube doesn´t light, voltage is then about 52 volts. i tried several caps, elkos and others, parallel to the pot but no difference in brightness. but if i touch the tube or different areas of the board, brightness gets much higher.

brightness with a cfl is very poor and also just on one side of the cfl. but how can it be: the tube lights also when it is just connected on one end. if i touch it, it gets much brighter too. this works alos with a small 230 v/ac lamp.

i want it much brighter. so i will try different cfl. do the aa boards deliver a higher voltage? anyway i am looking for further improvements in brightness. tnx to pirate for the difference info. in a short time i  will get some kodak boards from a photo-shop and will test them too.
tnx for all the help
jerry

did you try it like this

i can explain more about this circuit if you wont

also is the battery terminal i have said clf is that negitive?

[j037m]

@Bill
  Thanks for reminding me about Jeanna's work on the fuji circuit also . IF it had not been for her and everyone else like xee2 and Jim and you Doing Experiments on that fuji it would have jusy been the old Jose Pinto ( hope i spelled it right ) Mod.What i learned about it was from here and trying different things so i take only my % of credit . The whole belongs to the research group here . And you were the First to run 400 plus leds and make a video
I also wonder about Jim . I pray he well . By his recommendation i am taking non conventional medicine MMS to fight cancer . I feel a bit better , I dont know if it's actually helping me or not but i feel better.
Take care .

Al

yes bro your right thanks to them for helping us here to learn more good things like this one also thanks to you coz you also help us new member for guiding us like you doing now as i read this long thread. i learn also just on this thread alone youll see more updated and modification that all of you put..
;Djoey

[templer]

did you try it like this
i can explain more about this circuit if you wont
also is the battery terminal i have said clf is that negitive?

>>>do you connect the cfl to the negitive battery terminal and the second from the top flash terminal ?<<<
yes that works with less brightness compared to both tube sides connected to both of the flash terminals. tube lights also when just the second top flash terminal is connected. tube with just one end connected to the second top flash terminal is even a little brighter than connected the second tube end to the negative battery. all above works also with the cfl, but with much less brightness. the battery terminal you signed in the pic is the negative one!

it would be great to learn more about this circuit!

best
jerry