Adding AUX-IN port for HU - Team-BHP

gopz · 21st August 2007, 10:51

I read somewhere that adding an AUX-IN port to HUs which do not have AUX-IN is a simple procedure that any electronic technician could do. I want to know the opinions of Gurus here, if that can be done on Alpine HUs like 9873E.

It would be of great help to us. I even know a person who said that Alpine service technicians do this for Rs.800 (probably unofficially

Are there any risks involved? The warranty would go void for sure though!

gbpscars · 21st August 2007, 11:38

hi gopz,

i think u have decided not to part with ur new Alpine

well,.. yes it is possible and i'm using one on my super-grand old Alpine that can play only a Cass player and the AM-FM radio (Model #: TDA - someblahblah)

the "Cassette adaptor" option did not work with this piece as the cass player kept doing the auto reverse again and again in the auto reverse mode and did not work in the single direction play mode.

neither did the KCA-121B adaptor work, as this piece does not support telephone input.

as my set was worth nothing, i did not bother to meddle around (of course i have some expertise on electronics earlier). all i did was trace to a point where the cass player's head's signal gets out of its pre-amp section and enters the digi amp section.

i used an old LR discrete volume control in series before injecting the AUX signal at that point. this helps in controlling clipping to a great extent.

disadvantages:
- no control over a "jugalbandhi" performance when a cass is playing and an AUX signal is sent. it may even conk out the amp
- signals from the AUX playing MP3s with unbalanced amplitude sometimes clip the HU's amplifier.

this was just a boring sunday evening's project. but no idea how much heart you will have to do this to your new Alpine

possibly much simpler on a newer Circuits

navin · 21st August 2007, 12:00

Quote:

Originally Posted by gopz

I want to know the opinions of Gurus here, if that can be done on Alpine HUs like 9873E. Are there any risks involved? The warranty would go void for sure though!

can be done. warranty will be void ofcourse. the real danger is if it not done well you can damage your HU.

jkdas · 21st August 2007, 12:01

If you know someone who can do it properly then why not

gopz · 21st August 2007, 12:38

Will try to get in touch with the Alpine service engineer whom I was talking about...he might be the best person to do it, instead of a roadside TV mechanic

gopz · 21st August 2007, 14:06

Where is our L_B_M?

Need some technical advice..can I do this myself?

navin · 21st August 2007, 16:12

Quote:

Originally Posted by gopz

Need some technical advice..can I do this myself?

if you ahve the service manual and/or can trace the circuit easily why not?

low_bass_makker · 21st August 2007, 17:44

Quote:

Originally Posted by gopz

Where is our L_B_M?

Need some technical advice..can I do this myself?

The above HU 9873 does not have any Aux-in option. And I would not recommend it getting the HU opened and add the AUX from any place which will void any warranty.

gopz · 21st August 2007, 17:52

Quote:

Originally Posted by low_bass_makker

The above HU 9873 does not have any Aux-in option. And I would not recommend it getting the HU opened and add the AUX from any place which will void any warranty.

What if the Apline service center guy himself opens it and does it for me? Isnt it worth it?

low_bass_makker · 21st August 2007, 17:56

Quote:

Originally Posted by gopz

What if the Apline service center guy himself opens it and does it for me? Isnt it worth it?

What do you plan to connect to it..?

lordofgondor · 21st August 2007, 18:05

Hey L_B_M, this a question going along the lines of gopz. I have the OEM Kenwood HU that comes factory fitted with Esteem VXi. Now I wanna listen the songs I have on my Ipod on the same. One option I have tried is using the ITrip FM transmitter, but the sound quality with this approach ain't good. So is there any other option for hooking my IPod to the HU? I ain't sure if my HU supports Aux In as of now?

gopz · 21st August 2007, 18:06

Quote:

Originally Posted by low_bass_makker

What do you plan to connect to it..?

MP3 player (other than iPod)

low_bass_makker · 21st August 2007, 18:15

Quote:

Originally Posted by gopz

MP3 player (other than iPod)

Then I would recommend the Ipod. as it is full compatable with the above HU. why go for another MP3 play if you can get a IPOD.

navin · 22nd August 2007, 10:04

Quote:

Originally Posted by low_bass_makker

Then I would recommend the Ipod. as it is full compatable with the above HU. why go for another MP3 play if you can get a IPOD.

wont he need a KCA 420 or soething like that to get full compatibilty?

Sam Kapasi · 22nd August 2007, 10:11

Oh I've heard of a few people that do this. What they do is that they connect an audio point to the audio switcher IC, at the point where the AM circuit pre is given to the switching IC.

The AM is disconnected (A simple track cut) and the pre put is injected straight in there. You won't need a pot to be connected in series, simply because you will be using the headphone out and your MP3 player volume can be lowered to prevent clipping.

It can be done by a good technician/ engineer.

You WILL void your warranty though.

21st August 2007, 10:51	#1 (permalink)
gopz BHPian Join Date: Apr 2007 Location: Bangalore Posts: 421 View My Garage	Adding AUX-IN port for HU I read somewhere that adding an AUX-IN port to HUs which do not have AUX-IN is a simple procedure that any electronic technician could do. I want to know the opinions of Gurus here, if that can be done on Alpine HUs like 9873E. It would be of great help to us. I even know a person who said that Alpine service technicians do this for Rs.800 (probably unofficially Are there any risks involved? The warranty would go void for sure though!

21st August 2007, 11:38	#2 (permalink)
gbpscars BHPian Join Date: Apr 2006 Location: Navi Mumbai Posts: 406 View My Garage	hi gopz, i think u have decided not to part with ur new Alpine well,.. yes it is possible and i'm using one on my super-grand old Alpine that can play only a Cass player and the AM-FM radio (Model #: TDA - someblahblah) the "Cassette adaptor" option did not work with this piece as the cass player kept doing the auto reverse again and again in the auto reverse mode and did not work in the single direction play mode. neither did the KCA-121B adaptor work, as this piece does not support telephone input. as my set was worth nothing, i did not bother to meddle around (of course i have some expertise on electronics earlier). all i did was trace to a point where the cass player's head's signal gets out of its pre-amp section and enters the digi amp section. i used an old LR discrete volume control in series before injecting the AUX signal at that point. this helps in controlling clipping to a great extent. disadvantages: - no control over a "jugalbandhi" performance when a cass is playing and an AUX signal is sent. it may even conk out the amp - signals from the AUX playing MP3s with unbalanced amplitude sometimes clip the HU's amplifier. this was just a boring sunday evening's project. but no idea how much heart you will have to do this to your new Alpine possibly much simpler on a newer Circuits __________________ ...looking forward to sit a few feet above mean road level and away from potholes... Last edited by gbpscars : 21st August 2007 at 11:47.

21st August 2007, 12:01	#4 (permalink)
jkdas Senior - BHPian Join Date: Sep 2005 Location: Thiruvananthapuram Posts: 5,150 View My Garage	If you know someone who can do it properly then why not __________________ "She may not look like much, but she's got it where it counts, kid."

21st August 2007, 18:05	#11 (permalink)
lordofgondor BHPian Join Date: May 2007 Location: NOIDA Posts: 100	Hey L_B_M, this a question going along the lines of gopz. I have the OEM Kenwood HU that comes factory fitted with Esteem VXi. Now I wanna listen the songs I have on my Ipod on the same. One option I have tried is using the ITrip FM transmitter, but the sound quality with this approach ain't good. So is there any other option for hooking my IPod to the HU? I ain't sure if my HU supports Aux In as of now? __________________ Not only is the universe stranger than we imagine, it is stranger than we can imagine!

22nd August 2007, 10:11	#15 (permalink)
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Mumbai (but watch this space) Posts: 6,700 View My Garage	Oh I've heard of a few people that do this. What they do is that they connect an audio point to the audio switcher IC, at the point where the AM circuit pre is given to the switching IC. The AM is disconnected (A simple track cut) and the pre put is injected straight in there. You won't need a pot to be connected in series, simply because you will be using the headphone out and your MP3 player volume can be lowered to prevent clipping. It can be done by a good technician/ engineer. You WILL void your warranty though. __________________ Live the YetiLife® *MA-DONNA! MA-DONNA! MA-DONNA!*

21st August 2007, 12:38	#5 (permalink)
gopz BHPian Join Date: Apr 2007 Location: Bangalore Posts: 421 View My Garage	Will try to get in touch with the Alpine service engineer whom I was talking about...he might be the best person to do it, instead of a roadside TV mechanic

21st August 2007, 14:06	#6 (permalink)
gopz BHPian Join Date: Apr 2007 Location: Bangalore Posts: 421 View My Garage	Where is our L_B_M? Need some technical advice..can I do this myself?

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