On 17.10.11 18:21, Erik Christiansen wrote:
> X = 47 uF (X2 type)
WHOOPS! Orders of magnitude alarm! Potential for explosion. (Not
kidding)
That is in reality 0.47 uF.
===========================
The print on the filter (.47 uF) is fine, my eyes are two decades
younger than Gene's, but probably not as acute, and I posted before
stopping to think that a 47 uF non-polarised high voltage cap wouldn't
leave a lot of room for the other bits in the fist-sized sealed metal
box.
What's more important is that the impedance of 47 uF at 50 Hz is only:
1/(2*pi*50*47*10^-6)
= 68 Ohms.
Connected directly across the mains, the electrolyte would boil, and the
capacitor would rupture messily or violently, depending on supply
voltage.
Sorry about the missing decimal point.
Erik
--
The universe contains any amount of horrible ways to be woken up,
such as the noise of the mob breaking down the front door, the scream
of fire engines, or the realization that today is the Monday which on
Friday night was a comfortably long way off.
- Terry Pratchett, _Moving Pictures_
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