Joule Thief

[nievesoliveras]

@ist

Jesus

[Trino Cularoid]

Power Supplies for LED Drivers
http://scribd.com/doc/7381636

[Light]

"what is the result?
- Yes, it might be interaction between fields leading to unbalanced force.
Did it once; there’s a movement but not very effective (say, not like in a coil gun).

[maw2432]

@ Pirate

Bill,  thanks for the suggestion, parallel now.   They all light but not as bright as when plugged into the wall. 
Were your LEDs brighter when plugged into wall?  I still think the Fuji circuit may be better. 

Bill

[jeanna]

@ jeanna

On my boards the black rectangular switch with a hole and two long prongs was the shutter switch, not the flash charge switch.

Thanks. That helps.

It took me quite a while to figure out how to modify the circuit board I have. Without the ability to test the traces to see where they go I do not think I can be of much help to you. I would suggest buying another board.

I will buy a double pack and maybe I hope they are different. Perhaps I can learn better how they design these things.

How do you "test the traces?" Do you use a dvm?

On the contrary you have been a lot of help.

There is a lot of black rubber-looking paint over much of the traces and I can't tell where things go.    I had been thinking this was a kind of heat protection, but maybe it isn't. Perhaps I could scrape some off...

First I will buy 2 more and I will not remove anything but the xenon bulb and big cap. If these are recycled cameras and random in design, then it makes sense to leave all the resistors in place, etc. but just cut the other end off the black diode.

I will check back before I change anything.
Thanks again for this help.

@ jesus, I think you have written the info I need in your very clear circuits. I am still uncomfortable reading circuit drawings. I guess this is how I will learn it. I invite you and anybody else to help.

Thank you,

jeanna

P.S. wow maw... good going. really 9volts isn't too much for 200 bulbs when you think about it. congratulations!

since I can modify this post I will add this link for others that may need it. It helps me a lot.
http://electronics.howstuffworks.com/camera-flash.htm