[sdiy] AC coupling on inputs/outputs.

[Tom Wiltshire]

This topic came up recently with Dave Dixon's filter. The problem with DC inputs on filters and VCAs is offsets. If there is one, the output will thump with a fast envelope, even if no signal is applied. AC coupling should eliminate the DC offset and minimise the thump. If you've carefully trimmed all the DC offsets out of your circuits, then I suppose you can go ahead and use DC inputs on everything.

T.


On 27 Aug 2010, at 14:32, Dave Kendall wrote:

> Hi all.
> 
> I think I understand why this is often done, but wonder how useful it really is in a modular. I have some EFM VCA PC boards that offer independent DC and an AC signal paths on inputs and outputs. Is there any particular reason why a VCA might benefit from AC coupling, rather than simple DC-capable Inputs/outputs?
> 
> I'm re-panelling several modules, and wonder whether the extra sockets/switches are worth including....
> 
> cheers,
> Dave
> 
> 
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