I'm going to try this, in a metal case, with twisted wire and toroids
on the input and output ...
https://www.amazon.com/Converter-DROK-Regulator-Inverter-Transformer/dp/B01NALDSJ0/ref=sr_1_3
Actually, KA7OEI is on the right track. Be prepared to be disappointed
with regards to RFI from Chinese dc-dc converter modules. Extensive
input and output filtering MUST be added if you want to eliminate a
significant amount of the conducted emissions garbage. And no, there
is no “progress” in the world of these modules. I have detailed
reviews of two such modules on my RFI page, with modification and
filtering recommendations. http://wb9jps.com/Gary_Johnson/RFI.html One
uses an LM2596, the other a MP1584EN. The latter is astoundingly bad
for several reasons...
-Gary NA6O
I haven't tried it, but KA7OEI has a page about suppressing RFI in these
http://ka7oei.blogspot.com/2015/02/a-quiet-5-volt-usb-car-power-supply.html?m=1
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