12v Step-down?

dr pepper said:

I have a little interest in Vlf, thanks to modern power supplies I have to do that well away from buildings & life.

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Me Too! The US Hams recently got access to 472-479 kHz (630 meters) and to 135.7-137.8 kHz (2,200 meters). Even living in a rural area, those frequencies are clobbered by SMPS power supplies...