[maemo-users] Audio connection problem

From: Larry Battraw lbattraw at gmail.com
Date: Thu Mar 13 17:02:16 EET 2008
On Thu, Mar 13, 2008 at 7:21 AM, David Hagood <david.hagood at gmail.com> wrote:
> I have found that running the N800 through a ground loop isolator helps immensely - especially if you are charging the device as you use it.
>  The Radio Shack ground loop isolator (RS #270-054) works well for this.

Yes, this is key.  The n800 will transmit noise via the headphone jack
if you are charging at the same time, particularly when charging from
something from something that can leak tiny amounts of AC current back
to the amplifier.  This is pretty much the case every time when
charging and connected to a AC-powered amplifier or even a DC amp
where you're using 120V inverter or 12V charger connected to the same
battery.  That's why it's minimized when using a tape adapter; there
is very little AC coupling between the tape read head and the tape
adapter.  Like the ground loop islolator, an audio transformer will do
the trick too (You'll need a 1:1 ratio on the windings).

Just my 2 cents-

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