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Old 10th May 2006, 23:54   #1
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Default Blaupunkt audio aux in problem?

I have a Blaupunkt Bologna C50 car audio.It has an aux in on the rear pannel.
I have connected a portable Sony Cd player to this aux in.I power the Cd player using a 12V to 4.5V Dc-DC converter which fits in the cigrate lighter slot.

Now my problem is that when i turn on the Cd and start playing it i can hear the noise of the CD motor spining from my car audio speakers,this noise increases as the motor spins faster.This problem does not occur if i use 2 AA battries to power the Cd instead of the DC source.i have tried different portable audio Cd players and this happens for all of them.

Please help me.

Last edited by merve_extreme : 10th May 2006 at 23:56.
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Old 11th May 2006, 00:01   #2
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This is because of the differance in the ground of the dc-dc converter and the aux in HU. It means that the dc-dc converter and Hu aux in have voltage devloped between ground points. U must change the dc-dc converter or it may damage ur cd player or HU aux point.

Also is this dc-dc converter of any make ? and if yes which make.

Last edited by low_bass_makker : 11th May 2006 at 00:04.
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Old 11th May 2006, 00:13   #3
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It is sony's original car power adapter.so from what you are telling me if i use the ground of the aux HU instead of the DC_DC converter's this problem will not happen.

should i take the ground from the HU of the car and give it to the DC-DC converter or should i give the +ve 4.5 V from the DC-DC converter and ground from the AUX HU to the CD player.

please help.i need to sort this ASAP.
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Old 11th May 2006, 00:39   #4
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u can do the later one and also connect the ground to the dc-dc -ive also, but first check for the voltage across the dc-dc converter output first before connecting any thing....

Last edited by low_bass_makker : 11th May 2006 at 00:41.
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Old 11th May 2006, 01:02   #5
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ok i am going to try it.
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Old 11th May 2006, 02:11   #6
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tried the method.it dosent help one bit.Is there a solution to this problem.
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Old 11th May 2006, 12:27   #7
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Try this.

You are using a Stereo EP (earphone pin) to 2 RCA audio out wire.
This wire then goes into the aux in on your HU right? Take a small wire and earth the negative of the RCA pin. I mean, take a wire and wrap it around the negative of the RCA. Then touch this wire to the chassis of the HU.

Let us know the result.
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Old 11th May 2006, 12:33   #8
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sam this is what i am trying to say....
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Old 11th May 2006, 12:57   #9
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Sorry LBM, I didn't read what you wrote earlier. This should solve the problem.
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Old 11th May 2006, 13:06   #10
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Quote:
Originally Posted by Sam Kapasi
Try this.

You are using a Stereo EP (earphone pin) to 2 RCA audio out wire.
This wire then goes into the aux in on your HU right? Take a small wire and earth the negative of the RCA pin. I mean, take a wire and wrap it around the negative of the RCA. Then touch this wire to the chassis of the HU.

Let us know the result.
this is not a RCA to stereo wire.on the rear aux in connector in blaupunkt there are 3 pins.Audio In left .audio in right and AF ground.

now what i did yesterday was took a piece of wire and connected the AF ground to the ground of the HU,but it dosent help.i even tried to connecting the HU ground to the ground of the DC-DC converter.

but it dosent help.what can be the cuase of theis issue.if i use a portable TV or mp3 player powered by same DC-DC and give the audio to the aux in there is no problem but all portable CD players are having this issue.i tried atleast 5 different makes.
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Old 11th May 2006, 13:37   #11
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Does anyone know how to design a ground loop supressor.if yes please give me the details.
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Old 12th May 2006, 01:38   #12
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Quote:
Originally Posted by merve_extreme
Does anyone know how to design a ground loop supressor.if yes please give me the details.
Install a better quality cigar lighter.
Try this and let me know
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Old 12th May 2006, 01:41   #13
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hey wait try this also.
Keep the volume on your portable cd player at a little more than the min volume. and then use the system volume control knob in the system.
I think the input sensitivity is high
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Old 12th May 2006, 10:08   #14
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Are you using line out or headphone out? If you are using the later what Kureti says can help.
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Old 12th May 2006, 11:53   #15
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Quote:
Originally Posted by kURETI
hey wait try this also.
Keep the volume on your portable cd player at a little more than the min volume. and then use the system volume control knob in the system.
I think the input sensitivity is high
yes i have tried keeping it at the bare minimum but the noise is ever present.And what better can i use than the original adapter.

Last edited by merve_extreme : 12th May 2006 at 11:54.
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