48V warts aren't at all common IME. Modems used to use 24VAC ones, but there aren't many of those left.
Cheers
Phil Hobbs
Sure the arcing is not so nice. We like these 15W Phihong wall warts with different blades for different countries.
I really wanted a 36V one, but I guess with DC switchers, people make what they need.
I've only seen modems use 9V AC, to get something like +/-12V I assume
I wonder how much hardware it takes to use USB-C, that's 20V,5A laptops are starting use it for charging
Probably uncommon because < 42V is SELV. As for 36, who knows; overshadowed by 24, just not an important value?
Tim
POE :== Power On Ethernet
Thanks to POE (Power On Ethernet) expect to see more 48V used. It was always a telco standard, so there's good DC/DC converter support.
A combination of 24VAC for the isolation transformer, and a voltage-doubler rectifier (two Schottky diodes, two capacitors), makes circa 65VDC and that's in the acceptable input range for those telco-style DC/DC converters.
You'd need a micro with in-built USB. the increased voltage, and re-purposed data lines need to be negotiated over a data channel.
+48VDC is a telecommunications industry standard voltage. There's tons of adapters all over the place. But the wart's often distal from the electric power outlet as shown below:
Thank you,
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