Joule Thief

[Pirate88179]

Wayne:

It's not the voltage range, it is, or at least may be, the frequency.  For example, our little basic JT circuits hand wound on a 1" toroid work at about 20khz or thereabouts.  A DMM can not read this in a reliable manner.

However, not being able to light a 10 watt tube is another matter.  It should light that up nicely so it is possible that the meter is reading decently.

Bill

PS  I have no idea what the freq is of one of our Fuji circuits.

[WayneJT]

Hi Bill
I am not too sure if I am using the oscope correctly, I am still learning here but it seems like the jt is sitting around 26 kHz with 1xAA connected does this sound right, will snap shot the screen.

Wayne



***PHOTO RE-SIZED BY THE MODERATOR***

[Pirate88179]

Wayne:

That is a nice screen shot there.  That sounds about right to me although, as I said, I have never checked the freq. on any of my Fuji's.  Jeanna would know as I am sure she has checked hers, and/or maybe someone else here can say.

Did you cut the end of your diode?  Or, I think some folks here just shorted it with a jumper.  From what I was told, that will give the full wave and, I believe it will increase the output.

On mine, I just cut the end without the silver stripe, and bent the diode up a little off of the circuit board.

Bill

[WayneJT]

Hi Bill

as I could not get to the diode with my cutters I unsoldered the anode side of the diode and then measured the voltage again, it had dropped down to around a volt..I guess that didnt work, I resoldered it back and I'm back up to around 280v..I think I will re-read some of the previous posts and figure this one out.
Thanks for your help Bill, its really appreciated.
Back when I get this fuji working without the diode.

Wayne.

[electricme]

Hey Wayne, that's a nice instrument you have there, I'll go and take a looksee at one shortly via google.

Hello Bill, I'm hopeing to get some fuji or Kodak boards soon, I need to make up some CFL drivers and see how far I can drive them.

Gadget, your welcome, I got a play catch up again.

jim