I was getting some electrical noise on my aux input, three taps and a short silence, repeated, overall frequency of the sequence is about 1 per second. What will there be in my D3 that produces 'noise' like that? Only happens when the engine is running, when it's off I got a high-pitched continuous tone instead.
I've stopped the noise by breaking the connecton between the ground from my sound source and the common ground on the aux input. The source is such that the ground for the sound signal is connected to the vehicle ground anyway.
+------+ --- Right ---- +--------+ --- Right ---- +------+
|Stereo| --- Ground --- |iPod ACM| --- --- |Source|
+------+ --- Left ----- +--------+ --- Left ----- +------+
5th Nov 2008 7:44 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72797
Tunisian mice in the gubbins???
5th Nov 2008 7:46 pm
10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
you've got an earth loop, the noise will be comms pulses on CANbus The aux socket is earthed out when nothing connected to prevent this (hence the 4th wire)
No kidding... I've had a new seat base and the new one has just as many mice in it as the last one
5th Nov 2008 7:54 pm
Carabraxis
Member Since: 30 Dec 2007
Location: Mansfield
Posts: 220
the squeak-squeak noise is the EPB
the tap-tap is either the disco trying to tell you something in morse code or it's a pedestrian stuck under the bonnet trying to get out
5th Nov 2008 7:54 pm
10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
the problem is lots of parallel wiring, to prevent inductive nose they need to cross power, data and audio at 90 degrees, or decouple them from 0V. Even screened cables are not immune from inductive interference if there are multiple earth paths
I think I might have created a lot of the problems for myself.... The custom audio install is a bit like a birds nest at this stage. Once I've proved it sort of works I'll take it all apart again and remove some of the loops.
5th Nov 2008 8:00 pm
christyler
Member Since: 31 Dec 2005
Location: Cork, Ireland
Posts: 1168
rob,
just ground the audio screened cables at one end only, the source end. CLUB "Ah Shor it'll be grand"
First D3 in the World with a Hydraulic Winch.
2006 Disco 3 TDV6 S Auto,
Diff Locks, Turbochipped, Raised Air Intake, 220volts Onboard, Onboard Compressor, Large Bore Exahust, Underbody Protection, One or two Other Mods as well.
Other toys include, Argo Avenger 8x8, Tatra 6x6 Motorhome (Being Built)
5th Nov 2008 11:12 pm
Popelka
Member Since: 31 May 2008
Location: Praha (Prague)
Posts: 2430
10forcash wrote:
the problem is lots of parallel wiring, to prevent inductive nose they need to cross power, data and audio at 90 degrees, or decouple them from 0V. Even screened cables are not immune from inductive interference if there are multiple earth paths
and in english this means Experience is a difficult teacher, because she gives the test first and then the lesson afterwards!!!!
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