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#1 | |
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Join Date: Mar 2003
Location: Vancouver
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First there's the one that's attached to this post (first half of schematic), with the disadvantage that you need a lot of capacitance if you are drawing appreciable current from the mains, or it doesn't work very well.
But I don't understand the following two. First: http://www.diyaudio.com/forums/attac...&postid=328821 Why are the two capacitors in parallel? In the case of DC, one would be reverse biased and the aluminum oxide dielectric will electrolyze. The other one keeps working, but what happens when DC offset changes sign (say plugged in somewhere else)? Then you end up with two ruined caps. Second: http://www.psaudio.com/products/images/306_1.jpg How can this work with such small capacitors? All that the maker said in the previous thread where this was mentioned is: Quote:
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#2 |
On Hiatus
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First question: maybe the diodes in series-parallel might provide a clue? The e-lytics can't see more than 1.4V or so even in the case of DC.
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#3 |
Account Disabled
Join Date: Mar 2003
Location: Vancouver
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By that logic there's no point in having them antiparallel. Yet the schematic explicitly shows they are not facing the same way. Indeed, you don't even need two capacitors, just one. So that doesn't fit. In any case, I think any DC over time will electrolyze the dielectric. To make a non-polar electrolytic you need to put two in series, facing opposite ways.
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#4 |
Electrons are yellow and more is better!
diyAudio Member
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It's pretty useless to have anti-parallel caps since Lars Clausen uses only one capacitor and it seems to work, I'll gather having anti-parallel caps doesn't do any harm either. I have two in series then I won't have to worry.
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#5 |
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Join Date: Mar 2003
Location: Vancouver
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What about the last circuit? That's the one that's hardest for me to understand, as there's no schematic. I can't figure out any configuration that works with such small capacitors.
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