Nice circuit. Perhaps unnecessary to say, but a fuse probably wouldn't be w=
asted
in this application, you never know the capacitor shorts..

A question: if I'm 100% sure that I'm getting my neutral/line wiring right,=
 is
there any safety risk/concern in touching the neutral wire? I mean, could t=
here
ever happen anything at the power station that makes me get an electrical s=
hock
if I touch the neutral wire? I don't think they'll ever swap neutral and li=
ne,
it would even be quite hard to do technically for them (as, as far as I kno=
w,
neutral wires are all grounded).

Another question.. if I use an isolation transformer, neither touching eith=
er of
the secondary wires will provoke an electrical shock (of course not touch b=
oth
wires together :D ), right?
But what is that makes me get a little shock when I touch the line wire, th=
e
resistive path to earth or the capacitive coupling with the earth (thus it =
would
give me a shock even if I was flying and not touching the ground)?

Cheers,
Mario



At 15.21 2011.09.13, you wrote:
>Em 13/9/2011 08:59, M.L. escreveu:
>> On Tue, Sep 13, 2011 at 7:38 AM, Isaac Marino Bavaresco
>> <isaacbavaresco@yahoo.com.br> wrote:
>>> A 150nF x 450V SMD capacitor is available in 1812 package (4.5mm x 3.2m=
m
>>> x 2.0mm).
>>>
>> Are safety-rated caps (X1/Y1) required for this type of supply?
>>
>
>
>Perhaps not, because no one will use the capacitor alone, usually it is
>used together with a small resistor (around 100 ohm) in series to avoid
>a huge inrush current when connecting the circuit to the AC line.
>
>The OP could use a thru-hole resistor for this role, to obey the IEC
>norm that specifies 8mm of clearance between conductors before a current
>limiting device (the resistor itself). I don't remember what norm is
>that, and I am sure it was superseded already by another one.
>
>See the attached circuit.
>
>
>
>Best regards,
>
>Isaac
>=20
>
>
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