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RE: ideas on variable filament supplies?

I have built but not tested yet other then on the bench into resisters. I really neat little quad dht filament supply. It uses the technology that has been made incredibly cheap and efficient for led supplies and solar I think.

My supply uses 4 neat little dc to dc convertors 95% plus efficient. They cost 5$ each. There are many to be had. They can be bought in voltage regulated current regulated or both designed for battery charging.

I know anyone reading this is probably thinking omg super noisy but they are so efficient in converting dc to dc with out the need for a noisy r and so much less demanding on the power trans and rectification these hi tech units with a little extra filtering might be very good indeed.

Maybe I am missing something really obvious because I cant think why I havent seen them used yet for this use.

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