Menticol
Active Member
Hello!!
It's a very old idea, but I want to add a Line In to my OEM car stereo (for iPod, or anything with 3.5mm jack). I have done it before with multiple Boom box models. Please, I have some questions
My first method for boom boxes, not used anymore: Wiring the iPod directly to amplifier IC input: I think is not a good practice, but anyhow it worked. I guess the stronger iPod signal masked the other. Is this dangerous for the amplifier or associated circuits?
(Now I use a switch to select between the radio module output and the iPod, is more decent)
Now, with the car stereo, I tried to bypass the cassete deck sensors, and intercept the signal coming from the tape head. Worked perfectly, but randomly a very strong interference is heard. I have read about impedance mismatch, but I cannot find any 1:1 transformer. As far as my knowedge goes, I use a resistor to keep the signal soft to avoid overdriving the preamplifier. But why did the thing sometimes work, at randon times, random volumes, and even without resistor?
Thank you!
It's a very old idea, but I want to add a Line In to my OEM car stereo (for iPod, or anything with 3.5mm jack). I have done it before with multiple Boom box models. Please, I have some questions
My first method for boom boxes, not used anymore: Wiring the iPod directly to amplifier IC input: I think is not a good practice, but anyhow it worked. I guess the stronger iPod signal masked the other. Is this dangerous for the amplifier or associated circuits?
(Now I use a switch to select between the radio module output and the iPod, is more decent)
Now, with the car stereo, I tried to bypass the cassete deck sensors, and intercept the signal coming from the tape head. Worked perfectly, but randomly a very strong interference is heard. I have read about impedance mismatch, but I cannot find any 1:1 transformer. As far as my knowedge goes, I use a resistor to keep the signal soft to avoid overdriving the preamplifier. But why did the thing sometimes work, at randon times, random volumes, and even without resistor?
Thank you!
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