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12v Inline Filter

newboost

By newboost,
in Car Audio & Electrical

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newboost Rising Star

newboost

Posted
Posted

I am haveing trouble with extra screens in the way of interferance,(only when the car is running) The screens are ok when the motor is not running, when the motor is running the screens have a wave flicker over them. The picture is ok just the wave which is bugging me heaps. I do have a Nesa multi video amplifier which has helped with some of this problem but not all . I have the alpine 202e dvd player up front with 3 Voxson screens running off it. I have used in line noise filters on the + rail with little success. If anyone can help me with this problem it would help me out lots.

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hypo32 Contributor

hypo32

Posted
Posted

I hate when screens start to flicker.

Couple thing to check which might help.

Check your power, make sure you are not getting voltage drops, make sure you have a really good earth too.

Get some good video leads that have some good shielding, might also help

Where have you put the inline filters? how many have you put in? try hook them up as close as you can to the screens. Let me know if any of this helps and good luck.....

turbo_brian Community Regular

turbo_brian

Posted
Posted

This is the visual version of stereo whining from alternator noise.

Check your grounding, might be worth running a joining ground wire from headunit, amps, screens, etc so that you have a common ground for all your ICE (In Car Entertainment), also check the grounding line on the battery, make sure it's more than sufficient to ground your upgraded devices (R32 GTRR grounding from the battery to the chassis/body was less than 4 gauge and when amps where introduced to most audio applications, the grounding was inadequite for the extra current.

Also (and this is my own personal thing), I tend to stay away from filters and the like until I have checked all the cabling and wiring, made sure I have done everything as recommended first, once I have met all the recommendations for a perfect install, I then start looking at filters and the like:

Recommended procedure:

*Always use a clean grounding/earthing point for all devices

*Always run your power down 1 side of the vehicle, and signal cables on the other side, if you have to cross over, do it at a 90 degree angle ( like + ) so that there is minimal area for signal transfer and interference to occur

*Check where vehicle power runs through the car, run your power the same side, the signal wire the other side (vehicle wiper power, lights, etc can interfere as well).

*Keep earth leads as short as possible, the shorter they are, the less resistance the cable has.

*Keep your earth leads at least as big as the 12v+ feed, current actually flows from negative cable to the positive cable, so negative is feeding power.

*Make sure battery earthing point is adequite for the entire car, sometimes it's worth upgrading the grounding.

There are some of the recommendations, I am sure there are many more that can be added to the list.

B.

  • 2 weeks later...
newboost Rising Star

newboost

Posted
  • Author
Posted

Grounding is ok, I have used a gounding kit from aerpro (it has got an extra 6 points in the engine bay) Power cable from the battery (+) is running down the drivers side (2 Guage for both + - cables) and rca cables to the amps go thru the centre of the car and the video signal wire runs down the passengers side, I am using double sheilded cable for the rca's. All the grounding points have been cleaned of all contaminates (paint,dirt). The filters are a close to the screens as possible.

turbo_brian Community Regular

turbo_brian

Posted
Posted
Grounding is ok, I have used a gounding kit from aerpro (it has got an extra 6 points in the engine bay) Power cable from the battery (+) is running down the drivers side (2 Guage for both + - cables) and rca cables to the amps go thru the centre of the car and the video signal wire runs down the passengers side, I am using double sheilded cable for the rca's. All the grounding points have been cleaned of all contaminates (paint,dirt). The filters are a close to the screens as possible.

Have you linked all the grounding points (ground from head unit, amps, screens) to equalise the voltages between everything?

I had a similar issue, and until I ran an 18 guage link to all the units, the sound just never vanished.

Reason was because the car had previously been in an accident, I was grounding on the body, which had been very poorly welded back on the chassis and connection was very poor, so grounding on the body was also effected, but linking the systems resolved the issue.

B.

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