Check out this guys projects. He has an extremely efficient power supply that 
is built for 12V but will run on a 5v 1A USB Brick/Wall-Wart. It is an 
Open-source project with files on github.
https://surfncircuits.com/

Collin

> On Mar 9, 2019, at 14:49, newxito <axta...@gmail.com> wrote:
> 
> I was using the good old MC34063 on all my boards but I just did a test with 
> the LT3757 (already mentioned in this group) using the high voltage flyback 
> power supply datasheet schematic with a DA2032 transformer. I’m really 
> impressed, 170V up to 69mA at 12V with around 86% efficiency, just a bit 
> warm, no audible noise. 
> 
> I’m not an electronic engineer, I don’t really know what I’m doing :-) So, 
> I’m sure that with a correct board design the efficiency could be improved.
> 
>  
> 
> 
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