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From: "Spehro Pefhany"
Subject: Re: transformerless 5V power supply
User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586))
Date: Sun, 15 Sep 2002 14:13:41 GMT
NNTP-Posting-Date: Sun, 15 Sep 2002 10:13:41 EDT
The renowned Steven wrote:
> The 5V won't be touch-safe, but maybe it doesn't have to. For instance if
> the device is in a properly isolated housing, with the required safety
> distance between circuit and user interface. More like a mechanical problem.
The general rule we seem to have settled on here is that when a person has
to ask about how to make a transformerless power supply in this class they
probably won't have the ability to do it safely.
An linear or switching wall wart supply (or an approved transformer) will
provide galvanic isolation and safety agency approvals.
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