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Overunity Machines Forum



Joule theif not working at 0.5 v ?

Started by omdano, January 27, 2014, 03:47:29 PM

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omdano

January 27, 2014, 03:47:29 PM
Hello , I have made a joule thief using the guide from MAKE channel about it the link is :
http://www.youtube.com/watch?v=gTAqGKt64WM

so... i used a 2N2222 transistor

And it lighted the led with a 1.5v battery (yea... 1.44 but yeah)

then i used a 0.5v battery but didn't work
Even tho it is told that it will work till 0.3v

What happened?
and how can i fix it ?

wings

#1
January 27, 2014, 04:23:26 PM
Quote from: omdano on January 27, 2014, 03:47:29 PM
Hello , I have made a joule thief using the guide from MAKE channel about it the link is :
http://www.youtube.com/watch?v=gTAqGKt64WM

so... i used a 2N2222 transistor

And it lighted the led with a 1.5v battery (yea... 1.44 but yeah)

then i used a 0.5v battery but didn't work
Even tho it is told that it will work till 0.3v

What happened?
and how can i fix it ?
basically a .6v to .7v is required for a silicon transistor , 0.3 for germanium

MarkE

#2
January 27, 2014, 04:45:20 PM
Quote from: omdano on January 27, 2014, 03:47:29 PM
Hello , I have made a joule thief using the guide from MAKE channel about it the link is :
http://www.youtube.com/watch?v=gTAqGKt64WM

so... i used a 2N2222 transistor

And it lighted the led with a 1.5v battery (yea... 1.44 but yeah)

then i used a 0.5v battery but didn't work
Even tho it is told that it will work till 0.3v

What happened?
and how can i fix it ?
Use a lower voltage transistor.  JFETs are ideal, Ge transistors will at least get you closer to zero.  If you use junction transistors, heating the transistor up will lower the starting voltage.  You could use that to invent the "match lite Joule Thief".

conradelektro

#3
January 27, 2014, 04:53:49 PM
This must be the fifth time that this issue comes up.

Attached is a circuit with 4 transistors 2SK170 in parallel which will work down to 50 mV (at about 2 mA).

It was first published by magpwr some time ago.

Greetings, Conrad

xee2

#4
January 27, 2014, 09:54:40 PM
Quote from: omdano on January 27, 2014, 03:47:29 PM

then i used a 0.5v battery but didn't work
Even tho it is told that it will work till 0.3v

What happened?
and how can i fix it ?


A silicon transistor Joule thief will often work at 0.4 volts if the voltage is slowly decreased while it is running. But will not generally not start at 0.4 volts.
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