Talk:Capacitive coupling

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How does capacitive coupling actually work if no current (inc displacement current) can flow between the plates?--Light current 23:46, 18 December 2005 (UTC)

In a DC circuit, it can't work. In an AC circuit, capacitors conduct by inducing voltages in their opposing plate. This is more useful for transmitting information than power. --ssd 23:24, 28 December 2005 (UTC)

The article previously said that inductive coupling "favoured the low-frequency component of a signal." This is not true. "Inductive coupling" is typically used to mean transformer coupling, which, like capactive coupling, is high-pass. 66.30.14.1 07:01, 21 March 2006 (UTC)

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[edit] Synonym

Isn't this the same thing as condenser coupling? -- Slowmover 17:10, 24 October 2006 (UTC)

Yes, but condenser is an obsolete term these days.
Atlant 17:38, 24 October 2006 (UTC)
Thanks. I'd never encountered the term condenser for capacitor before. Came across it because many stereo power amps from the 1970s/1980s have connections that are labelled that way, or have a switch to choose between "condenser" and "direct" coupling. Maybe this should be mentioned somewhere here, or in other relevant articles. Not being an expert, I leave it to someone else. -- Slowmover 20:10, 30 October 2006 (UTC)

[edit] AC coupling

I was looking for AC coupling, I got a redirection to here (Capacitive coupling). However, transformer coupling in another form of AC coupling and this is currently ignored. The solution might be to:

1. Write an article about AC coupling that covers both capacitive coupling and transformer coupling.

2. Write an article about transformer coupling and a small one about AC coupling that have links to the two of them.

[edit] In digital circuits (removed)

There used to be a section about the use of capacitive coupling in digital circuits. It seemed to imply that you can use a capacitor as a level-shifter. There are cases where nominally "digital" signals end up getting AC-coupled (for example, when Ethernet couples stuff through the isolation transformers). There are even cases where you would AC-couple a signal with a capacitor; for example, I might take a small-amplitude clock, one that doesn't swing sufficiently positive to give a good logic HIGH, and cap-couple it symmetric about Vdd/2, to make better use of the available peak-to-peak swing. That's not a very common thing to do, though, and the discussion that I removed was just wrong. —The preceding unsigned comment was added by 66.30.10.35 (talk • contribs) 10:29, 4 December 2006 (UTC).

[edit] Cleanup?

What is the reason for the cleanup tag? Please list suggestions or reasons here. Dicklyon 23:13, 19 February 2007 (UTC)