Joule Thief To Amplify Joule Thief?

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A Joule Thief depends on the same principle as boost converters. It uses the collapsing magnetic field of an inductor to increase the voltage over the input, in that way, they are the same.[/font][/size]
Simplifier - Voltage-Regulated Joule Thief (neocities.org)


Do not expect amps from BEMF spikes created by coil with collapsing magnetic field.
It is good to use with "dead" batteries to power LED.

[skywatcher]

Once again let me apologize if this  has been covered already.  I need your expert opinions. Let us say in a basic joule thief  you have .5 volts input and it lights up a 3 volt LED. Is it possible to replace the LED with ANOTHER joule thief which could then amplify the current to maybe 18 volts?   


The only issue I can think of is that the oscillating  current from the first joule might not be effective to run the 2nd joule  and might mess up the transistor operation in the 2nd joule thief.


Thanks.
Trevor

You can boost the voltage as high as you want, but this doesn't generate any energy.

[pix]

You can boost the voltage as high as you want, but this doesn't generate any energy.

Amen 

[Cadman]

yes,if you find a joule thief which can amplify current 

Exactly!

The usual joule thief is sort of a backward device if you want to increase the power out. Since it's the magnetic field doing the work the final output should be a greater amperage than given, since the strength of magnetic fields of coils are determined by ampere turns per meter.

Something I try to keep in mind is voltage does not exist in any equation for the strength of magnetic fields of coils. The magnetic field of a coil with 100 A-t at 200 volt and 1 amp is half as strong as a coil with 200 A-t at 0.5 volts and 1 amp.

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No energy is stored/created in magnetic core.
Energy is stored in the air gap.
What you put "in", you will get "out" minus losses.