[AMPS] 8877 rectifier board considerations

[Signal Hill Ranch]

Jim--

Take a look at the boards on Paul's site.  Think it might
save you a lot of time.

http://wd7s.home.att.net/triode_control.htm

Good Luck--John  W0UN



> > Hi folks,
> >
> > I'm at the point where I'm laying out the B+ rectifier
> > board for my 8877 project, and it occurs to me I don't
> > know much about component spacing for high-voltage (2800
> > VRMS, 3900VDC typical) applications.
> >
> > Considering a .062" (~ 1.6mm) FR-4 epoxy PCB and typical
> > environmental conditions, (dust, humidity, altitude, etc) I'm
> > wondering what a good rule of thumb would be for minimum spacing
> > between the diode strings?  For space and PCB cost considerations,
> > I'd like to lay the strings out more-or-less parallel to each other.
> > There's six 1N5408 diodes in each string, (FW bridge) with no
> > equalizing components.
> >
> > I realize the potential differs between points, but if
> > I wanted to assume that the peak voltage existed between every
> > point on the board, what would be a conservative spacing?  The
> > dialectric constant of the FR-4 material runs between 4.2 and 5.0,
> > and there's the air-gap to consider as well.
> >
> > Thanks,
> > Jim, N7CXI
> >
> >
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>--
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John W. Brosnahan
shr@ricc.net


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