Joule Thief

[WilbyInebriated]

@johnny
i don't have a good 'earth' ground as i am on the second floor. i did use the mains ground and that worked well.

@xee
thanks for trying it out with the fuji for me. no change tween loaded and unloaded huh? strange, my kk05a6 circuit draws less than 180mA @3v input with no load, with load it goes over 500mA.

[timmy1729]

sure just solder in some wires, if you remove the little silver metal tab thing (i think its for the shutter) that will give you 2 holes to choose for ground. if you remove the diode that would give you a hole for the positive to the bulb as well. i just used alligator clips to test it out.

I think I did something wrong on here because it won't even light a high-brightness LED fully. Also, if I use alligator clips to connect the battery, nothing happens if I clip either positive or negative to the battery connectors on the board. If I clip one of them and move the other clip around on the terminal, it will light, but not very bright. I am thinking I might just make a trip to Walgreens and get the photo guy to give me some fujis. The guy I talked to last week said that they always have a box of used ones that just get thrown away and I just need to ask the manager if it is cool to get a few of them.


Also, since the thread has been discussing transformers, I took some pics of the power supply that I've been grabbing parts from and wanted to see if anybody can tell me what can be done with these transformers. It doesn't necessarily have to be using the camera board. Maybe some JT application to really step up voltage? 

Sorry for the poor quality images. They're from my phone and I don't have the steadiest hands in the world.

[Mk1]

@Timmy1729

There is how i did it with a transformer the transformer needs at least 3 coil use the 2 lowest ohm coil for joule thief circuit.I will post picture soon.

You need to be sure if the transistor you are using is a npn or pnp ,when you see it that it dose not work ,try reversing the battery and or the led.

[xee2]

@Timmy1729

This link gives some good instructions on how to build a Joule thief.

http://www.google.com/url?q=http://www.evilmadscientist.com/article.php/joulethief&sa=X&oi=revisions_result&resnum=2&ct=result&cd=1&usg=AFQjCNGhx6mr7i8F3HwhKPqShhd6aXzTJw


 

[timmy1729]

@Timmy1729

There is how i did it with a transformer the transformer needs at least 3 coil use the 2 lowest ohm coil for joule thief circuit.I will post picture soon.

You need to be sure if the transistor you are using is a npn or pnp ,when you see it that it dose not work ,try reversing the battery and or the led.

I have no idea how many coils those have. I don't really want to take them apart so I'll see if I can find anything on them online somewhere. Thanks!