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Audio and Video Talk
Cable Talk
My friends, I was wrong, expensive cables matter a lot
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<blockquote data-quote="pwatts" data-source="post: 1027937" data-attributes="member: 146"><p>This trick is relatively unknown but works well. Electrolytic coupling capacitors are a necessary evil in some applications, but their performance greatly improves when there is a DC bias across them (or deteriorates in its absence, whichever way you slice it). Explanation is a chemical process I once read up on but long forgot. </p><p></p><p>In circuits where there is a known bias that's implicitly covered, but when it's just acting as a DC block for _possible_ DC (such as the input of a preamp) where there is no guarantee of presence/level/polarity, all bets are off. Some folks throw money at it with larger film caps, others try a misguided attempt of bypassing with a small film cap and other opt for bipolar caps, which are just two back-to-back caps in one package. </p><p></p><p>A clever solution was to use separate back-to-back electrolytics and connect the midpoint via a large resistor to some voltage rail in the circuit. This provides a bias that improves the performance yet still is invisible to both sides of the cap.</p></blockquote><p></p>
[QUOTE="pwatts, post: 1027937, member: 146"] This trick is relatively unknown but works well. Electrolytic coupling capacitors are a necessary evil in some applications, but their performance greatly improves when there is a DC bias across them (or deteriorates in its absence, whichever way you slice it). Explanation is a chemical process I once read up on but long forgot. In circuits where there is a known bias that's implicitly covered, but when it's just acting as a DC block for _possible_ DC (such as the input of a preamp) where there is no guarantee of presence/level/polarity, all bets are off. Some folks throw money at it with larger film caps, others try a misguided attempt of bypassing with a small film cap and other opt for bipolar caps, which are just two back-to-back caps in one package. A clever solution was to use separate back-to-back electrolytics and connect the midpoint via a large resistor to some voltage rail in the circuit. This provides a bias that improves the performance yet still is invisible to both sides of the cap. [/QUOTE]
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Audio and Video Talk
Cable Talk
My friends, I was wrong, expensive cables matter a lot
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