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I would like to connect my phone via jack cable (aux in) to my car stereo, which has no aux input (brand: JVC KD-G151). It is a CD player, so i wrote a silent disk to operate the cd player, and tried to figure out the connection points for the input signal.

Here the datasheet logic: (sorry for the shortcomings, I'm just a hobbyst wiht very limited knowledge)

  • From DSP_DAC RO and LO signals go on a 1.5V channel (AC or DC i dont know)
  • Next is the CD low pass filter, the output voltage 4.5V (AC or DC i dont know)
  • Last is the E.VOLUME block where the input voltage 4.4V (AC or DC i dont know) I connected the signals after the R595 and R585 resistors, and it works great. But one problem: first i had to connect the jack to the phone, start the music, and connect the aux to the resistors (i am using a switch now) In case of other order, it not works, signal not go through to E.VOLUME.

I can measure the 4.4V on E.volume input, so direct connection not sound good to my phone jack(can it damage my phone?) Does anybody knows, where should i connect it without to damage the input source? Before the CD low pass filter? With capacitor to block the DC voltage? Thanks. David

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    \$\begingroup\$ Today i found the solution, i desoldered the R595 and R585 0ohm resistors, thus broke the circuit and stoped the voltage from the CD LPF. If i feed the input here, the issues i wrote discontinue, and the aux in worsks perfectly. \$\endgroup\$ – davidszasz91 Feb 2 '19 at 19:49
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I put the aux cable in my JVC, it works good and the only drawback is that you cant play CDs anymore. I will try to solder two switches instead of resistors R595 and R585. That will enable me to switch between playing CDs and listen from Aux. R595 is on the left channel while the R585 is on the right channel.

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  • \$\begingroup\$ yes, switches are good options to use CD player too, i dont use CD, so desoldering was the easiest way. \$\endgroup\$ – davidszasz91 Jun 14 '19 at 8:26

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