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audioguru said:Hi Nigel and Indecided,
Both channels have a 10k resistor connected to the non-inverting (+) input of the opamp, and the other end of both 10k resistors connects to the junction of the two 27k resistors. :lol:
audioguru said:All your grounds need to be at a single point. But if you connect the preamp's ground to the chassis by the cigarette lighter jack, the car radio's ground is bouncing around by the current in its wire to the chassis.
A transformer is about the only way I can think of to provide isolation and break the ground loop. :lol: