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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 at 19:49

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