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Old 21st August 2007, 10:51   #1
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Default 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!
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Old 21st August 2007, 11:38   #2
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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

Last edited by gbpscars : 21st August 2007 at 11:47.
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Old 21st August 2007, 12:00   #3
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Quote:
Originally Posted by gopz View Post
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.
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Old 21st August 2007, 12:01   #4
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If you know someone who can do it properly then why not
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Old 21st August 2007, 12:38   #5
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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
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Old 21st August 2007, 14:06   #6
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Where is our L_B_M?


Need some technical advice..can I do this myself?
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Old 21st August 2007, 16:12   #7
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Quote:
Originally Posted by gopz View Post
Need some technical advice..can I do this myself?
if you ahve the service manual and/or can trace the circuit easily why not?
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Old 21st August 2007, 17:44   #8
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Quote:
Originally Posted by gopz View Post
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.
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Old 21st August 2007, 17:52   #9
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Quote:
Originally Posted by low_bass_makker View Post
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?
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Old 21st August 2007, 17:56   #10
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Originally Posted by gopz View Post
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..?
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Old 21st August 2007, 18:05   #11
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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?
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Old 21st August 2007, 18:06   #12
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Quote:
Originally Posted by low_bass_makker View Post
What do you plan to connect to it..?

MP3 player (other than iPod)
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Old 21st August 2007, 18:15   #13
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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.
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Old 22nd August 2007, 10:04   #14
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Originally Posted by low_bass_makker View Post
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?
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Old 22nd August 2007, 10:11   #15
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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.
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