Joule Thief

[AbbaRue]

Dr. Stiffler uses 1/4 inch copper tubing for a heat sink on his boards.
Just cut a piece an inch long and crimp it over the transistor.

[Pirate88179]

@ AbbaRue:

That's right.  I remember that now that you mentioned it.  Thanks for posting this. Merry Christmas to you.

Bill

[xee2]

@ Pirate88179

C or D cell will last longer. The transistor is problem with increasing power. Heat sink needs to cool the transistor chip which means it has to make contact with the silicon chip that transistor is made of. This is not possible in plastic case. Heat sinking plastic case will not help cool chip because plastic is a poor heat conductor. Cooling plastic case may help a little but not much. In plastic case most of heat is conducted away by the collector lead which does connect to the transistor chip.

[Pirate88179]

@ xee2:

Yes, I was afraid of that.  But, since the leads of the transistor go directly to the silicon, could we not place some type of heat sink on them?  I mean, I did that when soldering transistors on my color organ.  (I have a tendency to fry things if I am not careful, like LEDs)  I am probably reaching here but, if the leads are kept cool, maybe at least some of the heat will not reach the silicon?  If not, I guess this means replacing the transistor with one designed to handle more power and a heatsink.  I was just trying to keep it as simple as possible.  Thanks for your answer.

Bill

[innovation_station]

well guys i took apart an old 35 mill cam not a disposable one 

and i got some cap values the cap was marked lol 

it looks much similar to ones in the disposal ones same size in shape anyways...

values are ...

350 sv  160uf  photo 55deg c

maybe it matters.....

ist