Return to Answer

The reason for the humming noise is improper grounding. Audio signals are low voltage level AC signals (over simplified). An audio signal could be for example 1V, 1 KHz signal. When there is improper grounding, a low level noise signal example 10mV 50Hz can get coupled to the audio signal causing humming. (Values are made up)

I would suggest installing shielded cabling which will provide good grounding, that essentially is the passive circuit that you are seeking.

An audio signal at specific frequency with improper grounding (with noise) would look something like the signal shown below.

An audio signal at specific frequency with proper grounding (without noise) would look something like the signal again shown below.

The reason for the humming noise is improper grounding. Audio signals are low voltage level AC signals (over simplified). An audio signal could be for example 1V, 1 KHz signal. When there is improper grounding, a low level noise signal example 10mV 50Hz can get coupled to the audio signal causing humming. (Values are made up)

I would suggest installing shielded cabling which will provide good grounding, that essentially is the passive circuit that you are seeking.

An audio signal at specific frequency with improper grounding (with noise) would look something like the signal shown below.

Audio Signal with Noise

An audio signal at specific frequency with proper grounding (without noise) would look something like the signal again shown below.

Noiseless Audio Signal

The reason for the humming noise is improper grounding. Audio signals are low voltage level AC signals (Over simplified). An audio signal could be for example 1V, 1 KHz signal. When their is improper grounding, low level noise signal example 10mV 50Hz can get coupled to the audio signal causing humming. (Values are made up)

I would suggest installing shielded cabling which will provide good grounding, that essentially is the passive circuit that you are seeking.

An audio signal at specific frequency with improper grounding (with noise) would look something like the below signal.

An audio signal at specific frequency with proper grounding (without noise) would look something like the below signal.

The reason for the humming noise is improper grounding. Audio signals are low voltage level AC signals (over simplified). An audio signal could be for example 1V, 1 KHz signal. When there is improper grounding, a low level noise signal example 10mV 50Hz can get coupled to the audio signal causing humming. (Values are made up)

I would suggest installing shielded cabling which will provide good grounding, that essentially is the passive circuit that you are seeking.

An audio signal at specific frequency with improper grounding (with noise) would look something like the signal shown below.

An audio signal at specific frequency with proper grounding (without noise) would look something like the signal again shown below.

The reason for the humming noise is improper grounding. Audio signals are low voltage level AC signals (Over simplified). An audio signal could be for example example 1V, 1 KHz signal. When their is improper grounding, lower level noise signal example 10mV 50Hz can get coupled to the audio signal causing humming. (Values are made up)

I would suggest installing shielded cabling which will provide good grounding, that essentially is the passive circuit that you are seeking.

The reason for the humming noise is improper grounding. Audio signals are low voltage level AC signals (Over simplified). An audio signal could be for example 1V, 1 KHz signal. When their is improper grounding, low level noise signal example 10mV 50Hz can get coupled to the audio signal causing humming. (Values are made up)

I would suggest installing shielded cabling which will provide good grounding, that essentially is the passive circuit that you are seeking.

An audio signal at specific frequency with improper grounding (with noise) would look something like the below signal.

An audio signal at specific frequency with proper grounding (without noise) would look something like the below signal.