Blaupunkt audio aux in problem? - Team-BHP

merve_extreme · 11th May 2006, 00:54

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.

low_bass_makker · 11th May 2006, 01:01

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.

merve_extreme · 11th May 2006, 01:13

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.

low_bass_makker · 11th May 2006, 01:39

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....

merve_extreme · 11th May 2006, 02:02

ok i am going to try it.

merve_extreme · 11th May 2006, 03:11

tried the method.it dosent help one bit.Is there a solution to this problem.

Sam Kapasi · 11th May 2006, 13:27

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.

low_bass_makker · 11th May 2006, 13:33

sam this is what i am trying to say....

Sam Kapasi · 11th May 2006, 13:57

Sorry LBM, I didn't read what you wrote earlier. This should solve the problem.

merve_extreme · 11th May 2006, 14:06

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.

merve_extreme · 11th May 2006, 14:37

Does anyone know how to design a ground loop supressor.if yes please give me the details.

kURETI · 12th May 2006, 02:38

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

kURETI · 12th May 2006, 02:41

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

navin · 12th May 2006, 11:08

Are you using line out or headphone out? If you are using the later what Kureti says can help.

merve_extreme · 12th May 2006, 12:53

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.

11th May 2006, 00:54	#1 (permalink)
merve_extreme Senior - BHPian Join Date: Apr 2004 Location: Mumbai Posts: 1,290 View My Garage	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. __________________ No one has done more to improve the automobile than the one who invented it ----- Mercedes Benz Last edited by merve_extreme : 11th May 2006 at 00:56.

11th May 2006, 01:01	#2 (permalink)
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,042 View My Garage	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 01:04.

11th May 2006, 01:13	#3 (permalink)
merve_extreme Senior - BHPian Join Date: Apr 2004 Location: Mumbai Posts: 1,290 View My Garage	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. __________________ No one has done more to improve the automobile than the one who invented it ----- Mercedes Benz

11th May 2006, 01:39	#4 (permalink)
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,042 View My Garage	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 01:41.

11th May 2006, 02:02	#5 (permalink)
merve_extreme Senior - BHPian Join Date: Apr 2004 Location: Mumbai Posts: 1,290 View My Garage	ok i am going to try it. __________________ No one has done more to improve the automobile than the one who invented it ----- Mercedes Benz

11th May 2006, 03:11	#6 (permalink)
merve_extreme Senior - BHPian Join Date: Apr 2004 Location: Mumbai Posts: 1,290 View My Garage	tried the method.it dosent help one bit.Is there a solution to this problem. __________________ No one has done more to improve the automobile than the one who invented it ----- Mercedes Benz

11th May 2006, 13:27	#7 (permalink)
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Bombay (but watch this space) Posts: 7,211 View My Garage	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. __________________ Live the YetiLife®

11th May 2006, 13:33	#8 (permalink)
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,042 View My Garage	sam this is what i am trying to say....

11th May 2006, 13:57	#9 (permalink)
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Bombay (but watch this space) Posts: 7,211 View My Garage	Sorry LBM, I didn't read what you wrote earlier. This should solve the problem. __________________ Live the YetiLife®

11th May 2006, 14:37	#11 (permalink)
merve_extreme Senior - BHPian Join Date: Apr 2004 Location: Mumbai Posts: 1,290 View My Garage	Does anyone know how to design a ground loop supressor.if yes please give me the details. __________________ No one has done more to improve the automobile than the one who invented it ----- Mercedes Benz

12th May 2006, 02:41	#13 (permalink)
kURETI BHPian Join Date: Apr 2006 Location: Bangalore Posts: 81 Infractions: 0/1 (5)	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 __________________ Venu We Make Driving A Pleasure

12th May 2006, 11:08	#14 (permalink)
navin Team-BHP Support Join Date: Mar 2004 Location: mumbai Posts: 12,576	Are you using line out or headphone out? If you are using the later what Kureti says can help.

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