Re: Bleeders on PFC caps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Alexander Rice by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ajjrice-at-yahoo-dot-com>

18/12/2001 23:33:40, "Tesla list" <tesla-at-pupman-dot-com> wrote:

well there are two ways to figure this out, easiest is to know that after 5
RC time costants 
the voltae has decayed to about 1% of it's original value - so if you want
to discharge 
them almost completely after, say five secondes then the desired time
contant is one 
second so desired resistnace is desired time over capacitance = 1/330*10^-6
= 3.3k 
ohms
other way is to do it peciseley using

voltage at a time = (original voltage at time 0) e^(-t/rc)

... but ach cann'a be bothered laddie

stay safe

alex
 
>Original poster: "Jonathan Peakall by way of Terry Fritz
<twftesla-at-qwest-dot-net>" 
<jpeakall-at-mcn-dot-org>
>
>Howdy All,
> 
>I have a total of 330uf PFC in 6 capacitors. What would be a good value for
>some bleeder caps? I know the NST should drain them, but I may use the power
>supply for other things. Which reminds me, if I use the PSU for other stuff,
>and I accidentally leave the PFC in the circuit (the PFC is switchable) would
>it have an ill effect on most devices?
> 
>Thanks All,
> 
>Jonathan Peakall
>
>
>




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