Home › Forums › Other › OT: Buying a new car – are ‘they’ for real? › Basically, the changer cable
Basically, the changer cable will have L, R, and ground leads.
The goal is to connect L and R to the tip and center conductor of a 3.5 mm jack, and the end ring to ground.
You can also incorporate a switch that switches L and R between the 3.5 mm jack and the CD changer downstream.
Easy. This is basically house-wiring stuff, not even real electronic design.