Joule Thief

[timmy1729]

@timmy

To measure the voltage output place the meter red cable on the collector of the transistor and the black cable to ground.
That should give ac voltage without the LED with the LED could give 2.55v dc or more.

Jesus

What do I use for ground, the base fo the transistor? How do I measure with the LED?

[nievesoliveras]

@ist

Thank you innovation.

@jeanna

I got a camera in the beggining that even though it was not fuji it resembled it a lot. Except that its transformer had six legs but only five were working. It had a leg that had nothing comming from the transformer's coil.
I still have the transformer the transistor, the resistor and  the 0.22uf cap.
When I assemble the pieces together, it gives 1000v and it also lights a 13w cfl lamp.

@timmy

Put the meter negative on the negative side of the battery and the positive to the transistor collector to measure without the LED.
With the LED on just measure between its two legs to read the voltage it has.

Jesus

[jeanna]

So, I shorted the diode. I had already soldered a jumper wire to the - side so, I looped it around and wrapped it onto the other leg of the diode. So that is shorted.

Then I bent the trigger copper so it stays shut. Now that is shorted.

The starting is a little flakey, but easier than the other way. I move the battery into place, with the switch already on and ON SHE GOES! The battery may be lose - it is. or there is something flaky, but it is staying on and bright.

This time it is ac

The meter reads 0.00vdc and 137vac. measuring either side of the fluro tube.  ooo this is soo cool.

I think it started around 9:30AM. I will stay with it- nevermind the solder iron. I wonder if I could add the 35 led string??

Here is the pic AC power:

jeanna

[nievesoliveras]

@jeanna

You know what I did to keep the battery in place. I cut a piece of bicycle inner tube and wrapped around the battery holder with the battery on it. When you cut the rubber tube do it in a way that it comes out like a wide rubber band, or just use a wide rubber band around the battery holder.

Nice job you did!

Jesus

[jeanna]

@jesus,

Thanks.

That is a good idea about the tire. I used E- tape yesterday. Rubber band is a good idea.

I was thinking that the camera case might make a good "project box", since the battery is really held in place by that camera case. Plus the switch is right there in the right place too. You could just flip the camera charge switch and your under-counter fluro light would go on. If you needed to change the battery just reach into the bottom of the camera case and replace.

It would look kinda funny having cameras pointing out with fluro tubes nearby.

wadayathink Bill? Would this have an effect on a potential burglar to have a light right next to a camera with wires coming out of it hooking them together? 

Thanks again for everyone's help.

jeanna