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Re: [TCML] RE: Terry Filter Problem
Yes but, the ground area has the "greatest distance" (largest number of
pads). When I built my first Terry Filter, I allowed 3/4" distance from
hv terminals to various components minus the obvious parallel and series
strings, and I still arced across it. What stopped this was increasing
distance. I've also built a small mmc on such a pad layout. Same
problems occurred. I ended up using a small pin point soldering iron and
removed all the unused pads around components which took care of the
Scott's circuit hookup looks good. The only thing I see worrying are the
numerous pad holes. My theory is that the pad holes near the grounded
terminal add up to a distance that causes a substantial arc. Most of the
circuit is probably working up to the ground point and that is where I
think the pads are really causing problems. The grounded area is not the
only burned portion of the board. Pad holes like this with a high
voltage circuit is never good. I guarantee bad things will happen (been
there, done that, and it's a good experience).
Ed Phillips wrote:
Looks like the NST outputs are making their way to ground bypassing
mov's and RC circuit. See all those little copper pads on the solder
side of the board? Anything between RC and MOV's need to be removed.
These pads are a problem. Even all those pads around the main ground
terminal. Might want to turn it upside down and run it with the lights
off. One thing about these filters, they do need good isolation. Also,
once carbon forms, the problem gets worse.
Maybe, but............... Notice that the heavy burned area is
next to the ground terminal and that there isn't ANY obvious arcing
between the end of the WW resistor and the red [gnd] wire in the
vicinity. The copper pads are clean and the insulation is normal
color in the vicinity of the resistor terminal. If I read things
right the red wire is ground so the burned area is near the ground lug
end of what's already a ground wire.
Why use such expensive perf board, independent of the potential
arcing between ground pads?
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