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
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net https://hobbs-eo.com
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
-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https://www.seventransistorlabs.com/
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.
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+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,
-- Don Kuenz, KB7RPU
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