Joule theif : try out !

[xee2]

i can replace them with any germanium transistor or is there any specific types ?

Any NPN germanium transistor should work, but they are not easy to find. Note that germanium transistors do not work as good as silicon transistors so the circuit will not perform as well as a regular Joule thief.


You can use a PNP germanium if you reverse the battery.


Jfet schematic below (note, I have not built this so I do not know if it works). Circuit by sanjev21.


What you are trying to do is not easy. I suggest starting with something like this http://www.youtube.com/watch?v=D7CFkRLrtss for your first Joule thief.

[omdano]

Yea but i am looking for something to work with a 0.2 volt input

[forest]

Try some energy harvest electronics to step up voltage

[omdano]

About this circuit Xee , I would love to know .. If i use different Transistor (yes it is germanium ) , What will change in the circuit ?
And how can i calculate the differences , Thanks very much.

From your schematic : http://www.overunity.com/8629/peltier-candle-powered-jt/#.Ut1WXsqmq60
in your post

[omdano]

Btw : Can i in anyways make a joule theif with 200mv Input and a 2SC1815 GR331 transistor ? http://pdf1.alldatasheet.com/datasheet-pdf/view/428752/MCC/2SC1815-GR.html
Cause i have been told about this one being good for a try