Getting signal from stock E46 CD Changer ?

[johnnybean]

Hi, Does anyone know how to get signal from the stock CD changer? cos i am trying to feed in the amp without going through an impedance converter? Help Appreciated . thanks !!!

 

[aidilj]

Hi johnnybean

The signal can be tapped from the CD changer output like in the picture below. There are two connectors that connects to the CD changer, the audio signal is the connector on top - white wires with brown (ground), blue (left) and red (right) stripe. The other connector is the power and I/K bus wire (brown [ground], red with green stripe [positive] and white with red and yellow stripe [IBUS])which you want to keep connected to your head unit to be able to control the CD changer.

You are right that taking the signal from here will have the correct AUX impedance but hope you thought about handling the gain from this output because AUX line has fixed gain so does the amplifier. Connecting this directly to the amplifier will result a very loud volume that may damage your equipment. Hope you considered this already. The gain is normally handled by the head unit where you control the volume.

Hope this helps.

 

[johnnybean]

Ya understand that part......i guess the downside is that we have to control the sub-signal separately.
Anyway to tap it from the player ?

 

[aidilj]

Hey johnnybean,

Yes you can tap it from the head unit. You'll need to open it up and take it from the amplifier IC input. The impedance here would be correct and level controlled by the volume knob. You'll need to trace the board layout for this one with the help of amplifier IC datasheet.

Picture below shows the amplifier and power board of the head unit.

The monolithic amplifier IC

pinout of the old (non-ISO) 17pin connector

 

[ALBundy]

Good stuff Aidil, thanks for sharing!

 

[BlackCat]

Somehow this reminds me of "the Joker"... LOLs

I wonder if certain combinations of the PINs would render your HU to be a homing beacon or something strange that is outta this world altogether!!!

Would postings of 'the Joker' still exist in our forum?

 

[aidilj]

Hi BlackCat,
I just did a google on the forum and found a Joker post.

http://www.bmwclubmalaysia.com/forums/showthread.php?21849-Latest-counter-intelligence-report-everyone-must-read!!!

Whoever Joker is, he/she is a little messed up but I like it.

 

[jarance]

Hi BlackCat,
I just did a google on the forum and found a Joker post.

http://www.bmwclubmalaysia.com/forums/showthread.php?21849-Latest-counter-intelligence-report-everyone-must-read!!!

Whoever Joker is, he/she is a little messed up but I like it.

aidil, no way are you the joker.. or are you????

btw, keep up the DIY thing. I think you have overtake me. Time for me to retire lar..

 

[aidilj]

aidil, no way are you the joker.. or are you????

btw, keep up the DIY thing. I think you have overtake me. Time for me to retire lar..

Jarance you cannot retire, people here need you. I only know about stuff I worked on before and only electronics. I can't take your place..

No way I'm the joker.
:34::34::34::34:

Cheers

 

[johnnybean]

Thanks Aidilj....Do you happen to know which pin of the IC is the amp input?

 

[aidilj]

Yup since there are four channels, the pins are 11,12,14,15. you need to trace the layout to get which is which channel. In your application you would be interested in two of the pins.

This is my radio amplifier IC datasheet
http://www.st.com/stonline/products/literature/ds/8160.pdf

Cheers
aidil

 

[johnnybean]

Wow ! I am impressed . Where you get all this stuff ? Are you a car audio specialist ?
I swear to you i know some of this top 5 car audio specialist in KL who wont even touch this area.
Most would suggest get a new player !
Bravo ! man Thanks again !