# SIM800L GSM module humming noise

**URL:** <https://forum.arduino.cc/t/sim800l-gsm-module-humming-noise/1161679>\
**Category:** Audio\
**Created:** [August 24, 2023, 9:09pm UTC](https://forum.arduino.cc/t/sim800l-gsm-module-humming-noise/1161679 "2023-08-24T21:09:39Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![mohamedesalem](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/mohamedesalem/32/1013044_2.png) [@mohamedesalem](https://forum.arduino.cc/u/mohamedesalem)\
**Post date:** [August 26, 2023, 8:18pm UTC](https://forum.arduino.cc/t/sim800l-gsm-module-humming-noise/1161679/7 "2023-08-26T20:18:26Z")

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thank you for your reply.

i tried to do as you mentioned and connect the gnd and vcc of the two modules in the same point on the out of the power source, and unfortunately nothing happend.

but there is a weird thing happend i connected two potentiometers "one on the right wire and one on the left wire " of the audio out as in this photo

 ![image](https://europe1.discourse-cdn.com/arduino/original/4X/b/5/3/b5379b67a3f9f6d0fb515688b84bd24bed01b1c3.jpeg)

and i endedd with two values for them "the audio is somwhat clear in this point" **'73.7k ohm' and '21.5 k ohm'**

when i tried to replace them with a fixed resistors with the same values and they didn't work.

i really don't know what is the problem

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