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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