mic off white noise

Question

Hi I have mic + mixer + jack and xlr; and when I off the mic I have white noise, and when I on the mic I have an electronic noise. Do you know how to solved that ? I found only this topic : Noise Suppression in Mic

lspci | grep Audio 00:1f.3 Audio device: Intel Corporation 100 Series/C230 Series Chipset Family HD Audio Controller (rev 31)
cat /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xef120000 irq 133
cat /proc/asound/card0/codec* | grep Codec
Codec: Realtek ALC887-VD
Codec: Intel Skylake HDMI
alsactl -v
alsactl version 1.2.6

Does I Need to buy a new sound card ?

Sound like that : https://vocaroo.com/13lsNIHuahrE

Answer 1

the pcm and the front automatically return to 100%, when I go down in the green pcm and front there is no more white noise and electronic noise.

and when I want to use my speaker I can't choose on my setting (say " simultaneous output " ):

for settings of alsamixer I try to change my .conf like this : Alsamixer or Pulseaudio reverts PCM channel level to 100% in 14.04

[Element PCM] volume = merge

to

[Element PCM]
volume = ignore

But Now I can't select my speakers on pulseaudio panel settings.

maybe it comes from the capture, I lowered the volume