AC power on front panels
tractorb at ihug.co.nz
Sat Jan 14 13:59:54 CST 2006
----- Original Message -----
From: "Chuck Guzis" <cclist at sydex.com>
To: <cctalk at classiccmp.org>
Sent: Sunday, January 15, 2006 7:45 AM
Subject: Re: AC power on front panels
> On 1/14/2006 at 11:09 AM gordonjcp at gjcp.net wrote:
>>Surely a transformer would need to be powered all the time?
> So what? Your central heating system and doorbell have one. Much,
> if not
> most, modern electronic equipment, such as PCs, televisions, etc.
> all have
> some tiny draw from the AC mains even when powered off. If all
> needed was a very small DC supply you could do away with the
> and perhaps use a couple of capacitors in series with each side of
> line, followed by a rectifier and a zener--it wouldn't provide quite
> isolation from the line that would be ideal, but it wouldn't need a
For a practical implementation of this sort of arrangement see the
I threw this together to get round an issue with under-rated wafer
switch contacts being used for mains switching.
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