Joule Thief

[Pirate88179]

I have not played with camera circuits much.........but it seems to me the circuits with the neons are better than the circuits with the LED.

I just remembered something.  I think someone said the best way to modify camera boards is also the easiest.
Just remove the capacitor and bridge across the diode going to the capacitor ...........then give it a try.


gary

Gary:

You are right that this is the easiest way to mod a Fuji but I don't think it is the best.  Others that did it this way were not getting near as many volts out as doing it the other way...to my recollection anyway, which, of course, may or may not be correct.  It also may be exactly the same, I am not really sure now that I think about it.

Bill

[WayneJT]

Hi guys
I have recently got hold of some free cameras from the local photo shop and found a AA fuji amongst them and following WilbyInebriated diagram thanks Wilby for the photo, I have successfully made my first camera jt I am getting around 274vdc or 488v if I hook it up to 2xAA I'm not sure if this will burn out with the extra 1.5v it was free so will continue with the 2xAA, anyone know if this will end up destroying the circuit?

Wayne.

[Pirate88179]

Wayne:

Nice job.  Did you cut the diode end as well?  I ask this because you should be getting closer to 400 volts out with a single AA battery.

I have heard of some folks running these circuits on 3 volts with no problems.  If it is going to be on a while, I would touch the transistor to see if it is getting hot...if so, not good.  Possibly a heat sink could be rigged up.

Also, did you use a DMM to check your volts out?  If so, this is not a reliable way due to the higher frequencies involved and most of those meters are designed to test 60 hz stuff.

With just a single AA, what can you light up?  This is a good way to get an idea of the actual output.

Bill

[WayneJT]

Hi Bill
I was wondering about the diode, I did see somewhere way back about cutting it, but was pretty excited about get the volts I am now and as I dont have another fuji yet was a little reluctant to stuff this one up, but will do it as soon as I can find the photo with the info on the diode that was posted somewhere in this topic.
thanks Bill

Wayne. 

[WayneJT]

Bill

I have been using a dmm set to 500v range,I should try out my usb Poscope. Ihave a 6w fluorescent tube that flickered on for a short time and then nothing, the same went for the 10w bulb.

Wayne.