Joule Thief

[Dave45]

So could we use this to take high voltage ac bring down the voltage and boost the amperage.

I guess I already know the answer to that but will we get an energy gain in the process is the real question.

We can use a mazilli circuit to get the high voltage at a low amperage cost but but but 
getting a pnp transistor that will handle the high voltage.
igbt maybe

[MarkE]

I guess I already know the answer to that but will we get an energy gain in the process is the real question.

We can use a mazilli circuit to get the high voltage at a low amperage cost but but but 
getting a pnp transistor that will handle the high voltage.
igbt maybe

No:  An ideal power converter would deliver 100% of the input power to the output.  No such thing has ever been demonstrated.  But efficiencies in the high 90%'s are routine enough.  A synchronously rectified buck converter is a complement of a synchronously rectified boost converter and some systems operate on that principle transferring power from a higher voltage bus down to another by bucking some of the time and going the other way by boosting from the lower voltage bus to the higher voltage bus some of the time.

[Dave45]

No:  An ideal power converter would deliver 100% of the input power to the output.  No such thing has ever been demonstrated

Lol Mark where's your sense of adventure 

[MarkE]

Lol Mark where's your sense of adventure 

I merely stated a fact.  I don't discourage anyone from trying. 

[Dave45]

One is always building one is always collapsing.