X2 capacitors

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pre65
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#1 X2 capacitors

Post by pre65 »

When putting X2 capacitors across live/neutral on (for example) mains transformers is there an optimum value ?

Common values seem to be 150nf, 220nf and 330nf. Is bigger better ?
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davebms
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#2 X2

Post by davebms »

o.o47uf seems to be recomended, pm me if you want some (due to a cock up i have to many) :oops:
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pre65
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#3

Post by pre65 »

that's 47nf. I had a few 220nf which I've used now.
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Mike H
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#4

Post by Mike H »

I would guess the value depends on what it needs to filter. These are mostly used to filter switched mode power supplies to stop noise leaking back onto the mains so a specific value for a filter could be decided. If you're using it to stop mains noise coming in then it's anybody's guess. :D
 
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