Joule Thief

[onthecuttingedge2005]

No, not pulling any legs, I'll try to remember to get you some in July.

just log the exact specifications of the capacitor you need so I can keep track of what I need to get.

[Pirate88179]

http://www.digikey.com/product-detail/en/ESHSR-0010C0-002R7/589-1002-ND/946802

TK:

These are the ones that I use.  I can send you some if you would like.

Bill

[bs2012]

Recently I am playing around with joule thief and found some interesting behaviour with jt.

Referring to the attach basic jt circuit, most people said that the base coil (green wire) turn on the transistor to allow current flow in the collector coil (red wire).  Yet I found a way to start jt with base coil open.  The led would be very deem and the drain from battery is very low, around 1 - 2 mA.  To do this, you need to have 13 times more turns in base coil than the collector coil.  I have some toroids even need 20 times to have this work.  Fewer turns in collector coil can sometimes work but you need to kick start the jt first.  While the led is on, disconnect the base coil from the battery and the led still light deemly.

Don't be disappointed with the deem light with this setup.  Just disconnect the led with the emitter leg of the transistor and then jam this open leg with the open wire of the base coil.  The led would be super bright.  Even brighter than with any of the jt I have!  However the battery drain is about 30% higher than the jt, measured at about 120 mA.  With some tuning, it could be reduced to around 70mA.

I am not sure if this hack is better than original jt.  Please replicate and tell me.

>>Moderator: Did fix the scaling of the images.

[TinselKoala]

@bs2012: there seems to be something wrong with your image files. They don't display inline, and they don't open as JPGs when I download them, not even as .bmps ......
Did you make the images in some program as some other file format, then just change the extension to .jpg so they would upload? That doesn't work.

[bs2012]

@bs2012: there seems to be something wrong with your image files. They don't display inline, and they don't open as JPGs when I download them, not even as .bmps ......
Did you make the images in some program as some other file format, then just change the extension to .jpg so they would upload? That doesn't work.

Finally the pictures could be displayed, though the sizing seems terrible.

Please help to verify my findings...