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Old 17-09-2007, 09:31 PM   #1
project.r.racing
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Mazda 3 3.5mm Aux Port

On the new car, (Mazda 3 MY06 Upgrade,) the stereo has a 3.5mm Aux port hidden in the centre compartment. Using $20 power adaptor from Woolies.

Here's the issue: -
When the iPod is connected without power supply, it plays fine. But when the power is connected, it has a clicking sound.

Clicks faster in sync with engines revs, so its a earthing issue. But the power is being supplied thru a standard cig lighter slot. The car also has a extra slot in the center compartment for power supply. Both slots have the same problem.

So the solution is:-
1) Play iPod without power supply, (defeats the purpose of power.)
2) Noise surpressor/filter, (if available.)
3) Other, (???)

Ryan
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Old 17-09-2007, 09:34 PM   #2
chicaboo
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Would you be prepared to try a ciggy power adapter to USB adapter? This means the USB cable can also be used as a data/charger cable on the PC too. It's not as gay as it sounds, I have one here for PDA, etc...

Gav.
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Old 17-09-2007, 09:38 PM   #3
project.r.racing
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I think it's a Mazda 3 problem, as same iPod when in the blue car doesn't have an issue. I'm assuming that the cig slots are earthed to the chassis and not a negative return. Hence the electrical feedback in background of sound.

What you have suggested is no different than what is currently in place. The power adaptor goes into same slot as USB adaptor.

Ryan
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Old 17-09-2007, 11:04 PM   #4
SP20XX
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I can strongly say that I don't think it's an earth issue.
Though I have been wrong in the past.
I think it's more of a spurious signal issue.
I have a similar problem with an FM Transmitter.

When I have my iBook sitting on the front seat running
off the PWM Switch Mode Power Supply powering it
from the Aux Power outlet (ie Cigarette Lighter) AND
I have the FM Tx'er connected to the Aux Power via the
same 3-way adapter, I too get the clicking with respect
to the revs.

Removed power connection to the FM Tx'er (so it's running
on batteries) and it's fine. What I'm planning to do is find
a Ferrite Coil and see if it absorbs away the spurious
feedback. If that's the case and I fix it, you might need to
get a ferrite coil too and put a full turn or two of the
power adapter for the iPod (in my case my TX'er power cable).
Hopefully that will work for you too.

I'll take all my gear in tomorrow to work, buy a ferrite and
test it out. Let you know the results.

For those who don't know about ferrite coils and beads, they
in a way, absorb "stray signals" to clean up power/signal lines.
Similar to the ones on the PS1 power cables and early console
controllers. Reason why you don't see them on the cable much
nower days, it because the surface mount bead version is now
incorporated into either the controller or console now.
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Old 17-09-2007, 11:32 PM   #5
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Check your FSM - in both cases the grounds end up back in teh main looms ....

Can be a nightmare, Gavs suggestion is the quickest thing to try... Otherwise you could be chasing the noise for months. Almost makes buying the official Mazda Ipod kit (which displays on the screen etc) worth the effort/cost.

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