3 ms·

But where do you stop? If a device supplies 20V instead of 5V, surely it might as well supply 230V.

• mark-r 8y ago
  There are legal limits, I don't think you can supply over 48V without entering a whole different regulatory structure.
• wlesieutre 8y ago
  That would require a catastrophic failure in the power brick which has significant separation designed in to the board layout to keep the primary line voltage side away from the secondary low voltage. See this comparison teardown between a genuine Apple magsafe charger and a counterfeit, especially the "What's wrong with this charger" section: http://www.righto.com/2016/03/counterfeit-macbook-charger-teardown.html http://www.righto.com/2016/03/counterfeit-macbook-charger-te... Related, Apple ran a discounted trade-in program where people could swap potentially dangerous phone chargers for safe ones after a counterfeit charger killed somebody: http://www.cbc.ca/news/technology/apple-replacing-fake-iphone-chargers-after-electric-shock-death-1.1313112 http://www.cbc.ca/news/technology/apple-replacing-fake-iphon...
• hinkley 8y ago
  With DC current you want to stay below 48 volts. There's a dog leg in how much damage you can do to a human being with electricity.
  • zaarn 8y ago
    Well, from experience you'll be mostly fine with 100 VDC too. 100VAC is a different story though. (AC flows better into the body while DC remains on the skin IIRC)