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In Reply to: RE: " Insert a "hash" filter" posted by Chris O on July 30, 2012 at 07:54:30
No - the small choke goes in series between the doubler stack and the filter caps, the 1000pf goes to ground downstream of the choke and ahead of the filter caps. It's a simple LC filter.Edited to make small clarification...
Edits: 07/31/12Follow Ups:
Also,
Treat the disease and not the symptom - use ultrafast soft recovery diodes for the restifier. They will produce 5 times less "hash" than standard diodes.
Cheers,
Ian
Even when zero switching noise Schottky diodes are employed, an issue remains to be dealt with, if high value caps. are installed in the doubler stack. Large amounts of capacitance imply a tiny conduction angle and a highly "triangular" ripple waveform. Per Fourier's Theorem, such a waveform contains high order harmonics of the ripple fundamental that extend well up into RF. The winding capacitance of a commonplace PSU filter choke is a short circuit at RF. The "hash" filter eliminates the crud that would sneak past the "routine" filter choke.
BTW, the "hash" filter also disposes of garbage riding on the AC mains.
Eli D.
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