Trying get rid of noise on audio signal of video camera when power adapter attached

Hey team,

If anyone can help me out with this, it would be greatly appreciated!

Equipment:
  • Video camera: Sony Handycam FDR AX-40
  • Audio source: Any audio source with 3.5 mm cable (aux) (3-pole), but it is mostly mic signal from an audio interface

Scenario 1: (Recording video with Power Adapter)
- As soon as audio cable is inserted into the mic-in jack there is a continuous noise on the audio track. Even when there is no other device connected to the other end of the 3.5 mm cable.
Scenario 2: (Recording video without Power Adapter)
- There is hardly any noise, if there is any, it is probably RF and other interference from camera's normal operation.

Attached is a very basic image file to help understand the device setup.
Attached is also a sample of audio with and without noise. (initially, with adapter, then without adapter). Warning: Headphone users and users of loud speakers may please reduce the volume before opening audio file. Zip file contains M4A and MP3 formats. audio length: 13 seconds.

thank You for reading about a problem that i am facing.

VideoCamera-Noise-Issue.png
 

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