29414Re: V9 output to audio card?
- Jan 1, 2009OK, it's getting better now - OR maybe I'm just more confused.
By "mains frequecy" you mean the 60 (or 50) cycles of the power line?
A "lowish" value (such as in the pF range?) will loook like a brick
wall to the low freq while allowing the "spiky" USB signal to pass....
Is there any signals as such on the ground wire of the USB connection?
AND does the ground wire not need to be a DC ground that would be
blocked by a capacitor? I guess I am still confused.... I'm starting
the new year in my "normal" state of mind- CONFUSED.
OR are you suggesting putting this "lowish" value capacitor on all the
USB wires to isolate them to prevent any ground loops?
Thanks to all for info shared in these forums.
73 de Ken H> K9FV
> Well, the current through ground loops is basically at mainsfrequency and
> its lower harmonics. A lowish value capacitor will have a highishimpedance
> at these frequencies so little current will flow.frequencies so
> The capacitor offers a relatively low impedance at the higher
> passing the spiky USB signal. In my case the impedance of the ground
> connection must have been high enough to suppress this signal.
> 73 Alan G4ZFQ
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