The whine comes from your alternator and the only way I have been able to kill the whine was to insert inductors in the power feeds to the head unit (most effective and lower cost) and power amplifiers. The key is not ground so much as it is the power feed to your head unit and amplifier.
A ground loop is created when a device ground connects to another devices ground before it reach's a common grounding point.Īssuming all grounding is solid and very low resistance: In electrical panels all grounds return to the panel that sourced the power, so no ground loops possible. It is good but not ideal so some noise can exist. The battery ground is often right to the metal chassis close by. I thought about opto-coupling the i2s signal coming out of ADC, but I'm not sure if that's a good way.Īll grounds in a car or system should have a common return point, such as a bolt that is chassis mounted. All the ground connections in the DSP are connected together, but I have the ability to change that. It consists of an ADC daughter board, a DSP board, and 2 DAC boards.
#GROUND LOOP ISOLATOR CAR AUDIO FULL#
I am designing the DSP, so I have full control over how it manages the ground. Other than a transformer in the way of the signal, what are some ways I can break this ground loop? I know about the ground loop isolator transformers, but those usually introduce a huge amount of distortion and dirty up the sound. This has been a source of whine and noise. This form a massive ground loop from the head unit through the RCA cables through the ground connection in the amplifier through the car's body back to the head unit. And the amplifier internally connects signal ground to the chassis. The head unit is referenced to car's chassis. Simulate this circuit – Schematic created using CircuitLab
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