Ok Ken
Further I would not worry as much regarding the voltage rating of the equalizing
resistors. Use physically large units with an adequate power rating (U^2 / R)
and they will probably be fine. After all there are more stories out there
about blown diodes than equalizing resistor flash-overs.
Are you sure you can't squeeze in at least three diodes per leg? This would ease
the equalizing resistor voltage requirements a bit too. Just two BY255's per leg
sounds scary for 2.3kV peak.
BR
Paul-Henrik
Quoting Ken <[email protected]>:
> Hi Paul.
> On my last mailing I got the BY255 current wrong.
>
> Ken
>
> M0KHW
>
> ----- Original Message -----
> From: "Paul-Henrik" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, November 29, 2009 2:45 PM
> Subject: Re: LF: Re: Re: 4kv diode
>
>
> BY255 should be a suitable building block rated 1300V PIV 3A.
>
> Use equalizing resistors in parallell with each diode, typical values used
> are
> 470...820kohm. Only controlled avalanche diodes can be series connected
> safely
> without a reverse voltage equalizing network.
>
> Make sure you implement a healthy safety marigin, ie. don't use just as many
> diodes needed to acheive the needed voltage rating. Using 3 amp diodes when
> 1
> amp is called for is no luxury either. You don't want to hear the sound of
> an
> angry rattlesnake from your thunderbox... this sound is often followed by
> popping and oozing electrolytic capacitors.
>
>
> Good luck and please don't get zapped
>
> Paul-Henrik
>
> Quoting mal hamilton <[email protected]>:
>
> > Yes series for more V parallel for more I(amps) and preferable some R and
> > C
> > across each except they are really identical.
> > mal/g3kev
> >
> > ----- Original Message -----
> > From: David Towers
> > To: [email protected]
> > Sent: Sunday, November 29, 2009 12:37 PM
> > Subject: Re: LF: Re: Re: 4kv diode
> >
> >
> > Hi Mal
> > surely "in series" to give a 4 KV diode at 1amp ?
> > dave G8SZX
> >
> >
> >
> > mal hamilton wrote:
> > Ken
> > On the serious side, use 6 x 1Kvolt @ 1A in parallel if u are stuck.
> > Don't get zapped
> > 73 mal/g3kev
> >
> > ----- Original Message -----
> > From: mal hamilton
> > To: [email protected]
> > Sent: Sunday, November 29, 2009 11:28 AM
> > Subject: LF: Re: 4kv diode
> >
> >
> > Electric Chair Co
> > Zapenda Cul de sac
> > Hellda State
> > Zip73
> >
> > ----- Original Message -----
> > From: Ken
> > To: [email protected]
> > Sent: Sunday, November 29, 2009 11:04 AM
> > Subject: LF: 4kv diode
> >
> >
> > Hello All.
> > I am looking for a BY4 or BY6 or equivalent diode, BY4 4kv @ 1A,
> > BY6 6kv @ 1A, I have searched the web and looked in Farnell, any ideas
> > please.
> >
> > 73.
> > Ken
> >
> > M0KHW
> >
> >
> >
>
>
>
>
>
>
>
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