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In Reply to: RE: Filter caps 5670 pre amp posted by Caucasian Blackplate on July 11, 2015 at 09:52:48
This is the schematic
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The negative side of the first 350 uF cap should connect DIRECTLY to the negative side of the recitifer bridge. Keep the ripple current to a loop that does NOT include the chassis. NEVER run any AC current through the chassis - connect power supply return to chassis at LAST filter cap.
There isn't anything particularly wrong with that, though it's not a very efficient setup if you're just supposed to end up with a 1:1 voltage ratio.
Regardless, if you have noise issues, it's related to the actual construction.
The reason for these things are 2 fold. One is that someone got a mess of cheap 12 volt transformers they are trying to use in production. The second is that they are trying to get around UL issues by making it able to use a 12 volt AC wall wort instead of plugging into the wall directly. This seems like the former. I have used this power supply once to build a S. Bench tube tester where you use the 12 volt for heaters. The power supply was supposed to be saggy and tolerant of faults.
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