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Could someone explain to me the operation of the fuse between centre tap and ground that is sometimes seen in full-wave rectifiers?
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It's electrically the same as putting it in the HT line between the rectifier and the first filter capacitor. The rectifier, transformer winding and filter cap form a series circuit, so the fuse functions the same no matter where it's inserted into that loop, just as sure as your Christmas tree lights all go out when one bulb blows.
From a safety perspective, it's somewhat better, because one of the contacts in the fuseholder is ground: you can make that whichever one is easiest to touch. Putting the fuse in the positive line, both contacts could be live if the fuse were removed with the filter capacitors still charged."Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?" -
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I need to get some theory a bit more firmly on board don't I? I persist in failing to see that earth is part of the circuit... thanks for the gentle explanation Steve!Comment
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Sometimes it can be helpful to trace a current path on your schematic. When i train people I often ask them to figure out the current path through a bridge rectifier for each polarity of the AC applied.Education is what you're left with after you have forgotten what you have learned.Comment
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